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This is where you need to decide what shape you want your monster to be and what components it will include. You need to make sure there is room for each of your components and the battery pack as well as decide where you want to squeeze the monster for the components to turn on.
TIP: do not make your monster too big making your circuit components too spread out! Otherwise you will spend a long time sewing to connect the components together +, Using card, draw out the shape of your monster and cut it out. +, Fold the felt in half and draw out the design onto the felt using the template.
Make sure there is a part of the body that lies over the crease so that the back and front remain together after being cut out (as shown in the pictures). +, …
Connect one end of the micro usb cable to the computer, the other end to the Arduino Leonardo board.
Connect the positive side of the LED patch to pin 13 on the Arduino Leonardo. Connect the negative leg of the LED patch to GND on the board. You can use either of the 3 GND pins available on the board.
* black cable - GND
* orange cable - pin 13 +, Before you can start programming your Arduino, you will need to set it up on [http://www.mblock.cc/software/mblock/mblock3/ mBlock].
Choose the version depending on your operating system (e.g. If you have a MacBook, choose “Mac OS” / if you have Windows 10, choose “Windows 7 and above”). Download and run the installation files and then open mBlock.
Select the Arduino Leonardo board from the “Boards” menu.
Then connect to your Arduino board (the COM port number varies based upon your computer’s USB plugs - when you choose the correct one to which your Arduino Leonardo is connected to, the ON and TX led lights on the board will turn solid green, and orange respectively). +, On mBlock, you will need to create a simple code to have your Led patch blink every second.
The code shall look exactly like this: (see image)
You need to drag and drop each block from the “Scripts” section on the middle to the blank area on the right hand side.
You will find each block in the following subsections:
# When <flag> clicked - “Events” subsection
# forever / wait 1 secs - “Control” subsection
# set digital pin… - “Robots” subsection
Note the you can change small details to make your own personal code. For example you can change the frequency of the blinking by shortening or lengthening the delay between each “HIGH” state and “LOW” state of pin 13.
When you are done coding, click on “Upgrade Firmware” in the Connect menu (at which point both the RX and the TX led lights on the board will flash orange).
Do this only once. You can now modify your code without having to Upgrade the Firmware each time. +, …
Connect one end of the micro usb cable to the computer, the other end to the Arduino Leonardo board.
Connect the positive side of the LED patch to pin 13 on the Arduino Leonardo. Connect the negative leg of the LED patch to GND on the board. You can use either of the 3 GND pins available on the board.
* black cable - GND
* orange cable - pin 13 +, Before you can start programming your Arduino, you will need to set it up on [http://www.mblock.cc/software/mblock/mblock3/ mBlock].
Choose the version depending on your operating system (e.g. If you have a MacBook, choose “Mac OS” / if you have Windows 10, choose “Windows 7 and above”). Download and run the installation files and then open mBlock.
Select the Arduino Leonardo board from the “Boards” menu.
Then connect to your Arduino board (the COM port number varies based upon your computer’s USB plugs - when you choose the correct one to which your Arduino Leonardo is connected to, the ON and TX led lights on the board will turn solid green, and orange respectively). +, On mBlock, you will need to create a simple code to have your Led patch blink every second.
The code shall look exactly like this: (see image)
You need to drag and drop each block from the “Scripts” section on the middle to the blank area on the right hand side.
You will find each block in the following subsections:
# When <flag> clicked - “Events” subsection
# forever / wait 1 secs - “Control” subsection
# set digital pin… - “Robots” subsection
Note the you can change small details to make your own personal code. For example you can change the frequency of the blinking by shortening or lengthening the delay between each “HIGH” state and “LOW” state of pin 13.
When you are done coding, click on “Upgrade Firmware” in the Connect menu (at which point both the RX and the TX led lights on the board will flash orange).
Do this only once. You can now modify your code without having to Upgrade the Firmware each time. +, …
The Android app is linked to the smart bin using WIFI or Bluetooth. It collects waste data, contains fun facts to educate people about recycling and waste sorting. To motivate people to keep on sorting their waste, the app also shows you how much money you have accumulated. +, The smart bin, is linked to the app . To create the bin, motors and 4 ultrasonic sensors were used for motion detection, to detect when a user is inserting waste. The board (recyclable wood) was laser cut to divide the waste compartments accordingly. +, Recycle plastics to produce PETG filament for 3D printing. +, …
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It is possible to assemble an EMI probe using an arduino Uno or an arduino nano.
A timelapse of the assembly process of an EMI probe based on arduino nano.
A video of the assembly process of an EMI probe based on arduino uno
''wiring diagram for the EMI probe''
To begin with, solder 3 male headers on the PCB. When you will plug the PCB onto the arduino board, the headers will have to go into pin 9, GND, and Analaog5.
Solder the speaker onto the PCB. The positive leg of the speaker need to be connected to the male header going into pin 9 of the arduino board.
The other leg (negative leg) of the speaker needs be connected to one end of the resistor (via some hook up wire).
Now, solder the resistor onto the PCB. Connect one end of the resistor to the male header going into GND on the arduino board. Connect the other end to the header going into A5.
Grab a piece of solid core wire about 20 cm long, and solder one end in correspondence with the male header going into A5.
Your EMI probe is ready. +, <nowiki>Whether you re using an arduino uno or a nano, the code that you ll need to upload in order for the probe to function correctly is basically the same.<br /><br />Just make sure to program the correct digital pin for the piezo speaker. In the instructions above, we connected the speaker on D9 on an arduino uno, and D3 on an arduino nano.<br /><br />// Arduino Electromagnetic interference detector<br /><br />// Code modified by Patrick Di Justo, based on<br /><br />// Aaron ALAI EMF Detector April 22nd 2009 VERSION 1.0<br /><br />// aaronalai1@gmail.com<br /><br />//<br /><br />// This outputs sound and numeric data to the 4char<br /><br />#include <SoftwareSerial.h><br /><br />#define SerialIn 2<br /><br />#define SerialOut 7<br /><br />#define wDelay 900<br /><br />int inPin = 5;<br /><br />int val = 0;<br /><br />SoftwareSerial mySerialPort(SerialIn, SerialOut);<br /><br />void setup()<br /><br />{<br /><br />pinMode(SerialOut, OUTPUT);<br /><br />pinMode(SerialIn, INPUT);<br /><br />mySerialPort.begin(19200);<br /><br />mySerialPort.print("vv");<br /><br />mySerialPort.print("xxxx");<br /><br />delay(wDelay);<br /><br />mySerialPort.print("----");<br /><br />delay(wDelay);<br /><br />mySerialPort.print("8888");<br /><br />delay(wDelay);<br /><br />mySerialPort.print("xxxx");<br /><br />delay(wDelay);<br /><br />Serial.begin(9600);<br /><br />}<br /><br />void loop()<br /><br />{<br /><br />val = analogRead(inPin);<br /><br />Serial.println(val);<br /><br />dispData(val);<br /><br />val = map(val, 1, 100, 1, 2048);<br /><br />tone(9,val,10);<br /><br />}<br /><br />void dispData(int i)<br /><br />{<br /><br />if ((i<-999)</nowiki> +, <nowiki>https://www.facebook.com/digijeunes/videos/530410277480950/</nowiki> +
The EMI detector comes in two forms: the gadget is mounted on a shield suitable for an arduino uno board, or the detector is embedded on a shield on which an arduino nano is mounted.
We will start by building the shield for arduino uno
here s the wiring diagram for the EMI detector
== Step by step instructions for the Arduino Uno shield ==
First, solder at least a couple of pins to the PCB. These will go into GND and Analog 5 in th arduino uno board.
Next, solder an extra pin on the opposite side of the PCB. This will connect to Digital 9 on the arduino board.
The speaker will also be soldered onto the PCB. Solder the positive end of the speaker to the pin which goes into analog 9 on the arduino.
Solder the negative end of the speaker into the PCB.
Then connect a short (5 cm max) piece of electric wire to the negative end of the speaker. The other end of the cable is soldered on the pin which goes into GND.
Use a 1Mohm resistor to connect the pin which goes into GND and the one that goes into Analog 5 on the PCB (see photo above).
It’s now time to add the antenna of your EMI detector.
Take about 20 cm of solid core wire, and solder one end of it on to the PCB, precisely to the pin that goes into Analog 5 on the board.
= Step by step instructions for the Arduino Nano shield =
An timelapse is available here
Solder two strips of female headers onto a PCB (3cm x 7cm)
You will need to be able to arrange the arduino nano onto these strips of female headers.
Solder the positive side of the speaker to the PCB, in correspondence with the D3 pin. Solder the other end of the speaker onto the PCB, in correspondence with GND pin of the arduino nano.
Next, grab the 1Mohm resistor, and solder one end to the PCB pin which leads to A5 on the board, the other end to the PCB pin which goes into GND.
To make the antenna of your device, take a piece of solid core wire (about 15 cm long), and solder one end of it to the PCB pin which leads to GND on the arduino nano.
Finally, grap two short pieces of electric wire. You will use them to connect a 9V battery to the arduino nano and power the board. Solder one end of the first cable to VIN on the arduino nano, solder one end of the other cable to GND. , You can download the stl file and 3D print the case. The stl file is available[https://drive.google.com/open?id=1RncFtjXTi5H6E6J_COj7BYNa-ry2vzqX <u> here</u>]. +, <nowiki>Whether you re using an arduino uno or a nano, the code that you ll need to upload in order for the probe to function correctly is basically the same.<br /><br />Just make sure to program the correct digital pin for the piezo speaker. In the instructions above, we connected the speaker on D9 on an arduino uno, and D3 on an arduino nano.<br /><br />// Arduino Electromagnetic interference detector<br /><br />// Code modified by Patrick Di Justo, based on<br /><br />// Aaron ALAI EMF Detector April 22nd 2009 VERSION 1.0<br /><br />// aaronalai1@gmail.com<br /><br />//<br /><br />// This outputs sound and numeric data to the 4char<br /><br />#include <SoftwareSerial.h><br /><br />#define SerialIn 2<br /><br />#define SerialOut 7<br /><br />#define wDelay 900<br /><br />int inPin = 5;<br /><br />int val = 0;<br /><br />SoftwareSerial mySerialPort(SerialIn, SerialOut);<br /><br />void setup()<br /><br />{<br /><br />pinMode(SerialOut, OUTPUT);<br /><br />pinMode(SerialIn, INPUT);<br /><br />mySerialPort.begin(19200);<br /><br />mySerialPort.print("vv");<br /><br />mySerialPort.print("xxxx");<br /><br />delay(wDelay);<br /><br />mySerialPort.print("----");<br /><br />delay(wDelay);<br /><br />mySerialPort.print("8888");<br /><br />delay(wDelay);<br /><br />mySerialPort.print("xxxx");<br /><br />delay(wDelay);<br /><br />Serial.begin(9600);<br /><br />}<br /><br />void loop()<br /><br />{<br /><br />val = analogRead(inPin);<br /><br />Serial.println(val);<br /><br />dispData(val);<br /><br />val = map(val, 1, 100, 1, 2048);<br /><br />tone(9,val,10);<br /><br />}<br /><br />void dispData(int i)<br /><br />{<br /><br />if ((i<-999)</nowiki> +, …
<nowiki>Whether you re using an arduino uno or a nano, the code that you ll need to upload in order for the probe to function correctly is basically the same.<br /><br />Just make sure to program the correct digital pin for the piezo speaker. In the instructions above, we connected the speaker on D9 on an arduino uno, and D3 on an arduino nano.<br /><br />// Arduino Electromagnetic interference detector<br /><br />// Code modified by Patrick Di Justo, based on<br /><br />// Aaron ALAI EMF Detector April 22nd 2009 VERSION 1.0<br /><br />// aaronalai1@gmail.com<br /><br />//<br /><br />// This outputs sound and numeric data to the 4char<br /><br />#include <SoftwareSerial.h><br /><br />#define SerialIn 2<br /><br />#define SerialOut 7<br /><br />#define wDelay 900<br /><br />int inPin = 5;<br /><br />int val = 0;<br /><br />SoftwareSerial mySerialPort(SerialIn, SerialOut);<br /><br />void setup()<br /><br />{<br /><br />pinMode(SerialOut, OUTPUT);<br /><br />pinMode(SerialIn, INPUT);<br /><br />mySerialPort.begin(19200);<br /><br />mySerialPort.print("vv");<br /><br />mySerialPort.print("xxxx");<br /><br />delay(wDelay);<br /><br />mySerialPort.print("----");<br /><br />delay(wDelay);<br /><br />mySerialPort.print("8888");<br /><br />delay(wDelay);<br /><br />mySerialPort.print("xxxx");<br /><br />delay(wDelay);<br /><br />Serial.begin(9600);<br /><br />}<br /><br />void loop()<br /><br />{<br /><br />val = analogRead(inPin);<br /><br />Serial.println(val);<br /><br />dispData(val);<br /><br />val = map(val, 1, 100, 1, 2048);<br /><br />tone(9,val,10);<br /><br />}<br /><br />void dispData(int i)<br /><br />{<br /><br />if ((i<-999)</nowiki> +, You can use the EMI probe to compare and contrast EMI radiations deriving from different electronic appliances.
Hold the probe next to a stereo system or a TV whilst these devices are in standby mode, and you ll probably get a similar reading to a laptop when this is turned on.
Once you ve found out which electronic appliances radiate the biggest amount of EMI when in standby mode, you can learn to plug these off to save energy. +
<nowiki><h2>Welcome to the HTML editor!</h2><br /><br /><p>Just type the HTML and it will be shown below.</p><br /><br /><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed elementum neque id magna. Mauris sollicitudin nisi sit amet sem. Etiam sit amet lectus a velit interdum facilisis. Vestibulum ante ipsum primis in faucibus orci <strong>luctus et ultrices posuere</strong> cubilia Curae; In tincidunt eleifend neque. Maecenas interdum, neque in fringilla pellentesque, lacus massa eleifend elit, nec scelerisque nulla orci a nunc. Quisque sollicitudin. Sed pulvinar lacus id lacus. Vestibulum imperdiet tellus eget risus. Quisque libero nisl, feugiat eu, euismod at, elementum eget, tellus. <a href="http://www.clesto.com">Clesto.com</a></p><br /><br /><img src="https://www.google.se/images/google_80wht.gif" alt="Google logo"><br /><br /><h2>Heading in h2, som more sample text</h2><br /><br /><p>Phasellus sem odio, varius quis, cursus at, ullamcorper eget, turpis. Maecenas a mi. Mauris dignissim lectus malesuada odio. Duis elit arcu, lobortis ut, porta ac, venenatis ornare, odio. Pellentesque scelerisque. Ut elementum laoreet massa. Suspendisse hendrerit odio eget turpis. Cras tellus dui, malesuada id, adipiscing ut, laoreet sed, magna. Phasellus scelerisque aliquet ligula. Quisque vitae elit sit amet enim suscipit interdum. Curabitur laoreet, mauris sit amet aliquet interdum, pede sapien malesuada metus, in tincidunt turpis justo id arcu. Donec gravida odio ac lectus. Nam rutrum ante in nisi laoreet aliquet. Sed at ante.</p><br /><br /><h3>Heading in h3, som more sample text</h3><br /><br /><p>Nulla facilisi. Nullam cursus scelerisque erat. Praesent convallis rhoncus dui. In hac habitasse platea dictumst. Nullam pellentesque. Mauris ac orci. Donec dictum. Etiam purus tortor, elementum a, posuere nec, pulvinar id, ipsum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Quisque vel justo. Nullam posuere purus sed arcu.</p><br /><br /><ul><br /><br /><li>Nulla facilisi.</li><br /><br /><li>Pellentesque habitant morbi</li><br /><br /><li>Quisque vel justo.</li><br /><br /><li>Nullam posuere purus sed arcu.</li><br /><br /></ul></nowiki>
You will need a Python IDE such as Thonny for this project. You can use any IDE, but for this project, we are using Thonny. To install and use Thonny:
*Go to https://thonny.org/
*Download
*Install and then open +, This is how your circuit should look like. You will need the ESP32 microcontroller, DHT22 temp/humidity module, breadboard and jumper wires.
* + pin on DHT22 to VCC on ESP
* out pin on DHT22 to GPIO pin 15 on ESP(can change depending on code)
* - pin on DHT22 to GND on ESP +, Go to https://ifttt.com/join
Sign up and create an account using the appropriate options
<br/> +, …
<nowiki><br/><div class="mw-highlight mw-content-ltr" dir="ltr"><pre>import machine<br />import time<br />import urequests<br />import network<br /><br /># Wi-Fi credentials<br />ssid = 'wifi_name' #input your own wifi name<br />password = 'password' #input your own password<br /><br /># IFTTT webhook key<br />api_key = 'your_own_key' #input your own key<br /><br /># Connect to Wi-Fi<br />station = network.WLAN(network.STA_IF)<br />station.active(True)<br />station.connect(ssid, password)<br />while station.isconnected() == False:<br /> pass<br />print('Connection successful')<br />print(station.ifconfig())<br /><br /># Set up ultrasonic sensor<br />trigger = machine.Pin(4, machine.Pin.OUT)<br />echo = machine.Pin(5, machine.Pin.IN)<br /><br /><br />def main():<br /> while True:<br /> # Send trigger pulse<br /> trigger.value(0)<br /> time.sleep_us(5)<br /> trigger.value(1)<br /> time.sleep_us(10)<br /> trigger.value(0)<br /><br /> # Measure duration of echo pulse<br /> while echo.value() == 0:<br /> start = time.ticks_us()<br /> while echo.value() == 1:<br /> end = time.ticks_us()<br /> duration = time.ticks_diff(end, start)<br /><br /> # Calculate distance<br /> distance = duration * 0.034 / 2<br /> <br /><br /> # Send data to IFTTT<br /> data = {'value1': distance}<br /> submitData("ultrasonic_distance", data)<br /><br /><br /> # Delay before next measurement<br /> time.sleep(5)<br /><br />def submitData(event, data):<br /> try:<br /> print('Sending data to IFTTT:', data)<br /> request_headers = {'Content-Type': 'application/json'}<br /> request = urequests.post(<br /> 'https://maker.ifttt.com/trigger/'+ event + '/with/key/' + api_key,<br /> json=data,headers=request_headers)<br /> print(request.text)<br /> request.close()<br /> except OSError as e:<br /> print('Failed to send data to IFTTT.', e)<br /> <br />if __name__ == '__main__':<br /> main()</pre></div></nowiki>
<nowiki>Copy the full code into your IDE. Feel free to change things like the text it prints, etc<br /><br /><br /><div class="mw-highlight mw-content-ltr" dir="ltr"><pre><span></span><span class="lineno"> 1 </span><span class="cp">#include</span> <span class="cpf"><WiFi.h></span><span class="cp"></span><br /><span class="lineno"> 2 </span><span class="cp">#include</span> <span class="cpf"><PubSubClient.h></span><span class="cp"></span><br /><span class="lineno"> 3 </span><br /><span class="lineno"> 4 </span><span class="c1">// WiFi</span><br /><span class="lineno"> 5 </span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">ssid</span> <span class="o">=</span> <span class="s">"xxxxx"</span><span class="p">;</span> <span class="c1">// Enter your Wi-Fi name</span><br /><span class="lineno"> 6 </span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">password</span> <span class="o">=</span> <span class="s">"xxxxx"</span><span class="p">;</span> <span class="c1">// Enter Wi-Fi password</span><br /><span class="lineno"> 7 </span><br /><span class="lineno"> 8 </span><span class="c1">// MQTT Broker</span><br /><span class="lineno"> 9 </span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">mqtt_broker</span> <span class="o">=</span> <span class="s">"broker.emqx.io"</span><span class="p">;</span><br /><span class="lineno">10 </span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">topic</span> <span class="o">=</span> <span class="s">"emqx/esp32"</span><span class="p">;</span><br /><span class="lineno">11 </span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">mqtt_username</span> <span class="o">=</span> <span class="s">"emqx"</span><span class="p">;</span><br /><span class="lineno">12 </span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">mqtt_password</span> <span class="o">=</span> <span class="s">"public"</span><span class="p">;</span><br /><span class="lineno">13 </span><span class="k">const</span> <span class="kt">int</span> <span class="n">mqtt_port</span> <span class="o">=</span> <span class="mi">1883</span><span class="p">;</span><br /><span class="lineno">14 </span><br /><span class="lineno">15 </span><span class="n">WiFiClient</span> <span class="n">espClient</span><span class="p">;</span><br /><span class="lineno">16 </span><span class="n">PubSubClient</span> <span class="nf">client</span><span class="p">(</span><span class="n">espClient</span><span class="p">);</span><br /><span class="lineno">17 </span><br /><span class="lineno">18 </span><span class="kt">void</span> <span class="nf">setup</span><span class="p">()</span> <span class="p">{</span><br /><span class="lineno">19 </span> <span class="c1">// Set software serial baud to 115200;</span><br /><span class="lineno">20 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">begin</span><span class="p">(</span><span class="mi">115200</span><span class="p">);</span><br /><span class="lineno">21 </span> <span class="c1">// Connecting to a WiFi network</span><br /><span class="lineno">22 </span> <span class="n">WiFi</span><span class="p">.</span><span class="n">begin</span><span class="p">(</span><span class="n">ssid</span><span class="p">,</span> <span class="n">password</span><span class="p">);</span><br /><span class="lineno">23 </span> <span class="k">while</span> <span class="p">(</span><span class="n">WiFi</span><span class="p">.</span><span class="n">status</span><span class="p">()</span> <span class="o">!=</span> <span class="n">WL_CONNECTED</span><span class="p">)</span> <span class="p">{</span><br /><span class="lineno">24 </span> <span class="n">delay</span><span class="p">(</span><span class="mi">500</span><span class="p">);</span><br /><span class="lineno">25 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="s">"Connecting to WiFi.."</span><span class="p">);</span><br /><span class="lineno">26 </span> <span class="p">}</span><br /><span class="lineno">27 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="s">"Connected to the Wi-Fi network"</span><span class="p">);</span><br /><span class="lineno">28 </span> <span class="c1">//connecting to a mqtt broker</span><br /><span class="lineno">29 </span> <span class="n">client</span><span class="p">.</span><span class="n">setServer</span><span class="p">(</span><span class="n">mqtt_broker</span><span class="p">,</span> <span class="n">mqtt_port</span><span class="p">);</span><br /><span class="lineno">30 </span> <span class="n">client</span><span class="p">.</span><span class="n">setCallback</span><span class="p">(</span><span class="n">callback</span><span class="p">);</span><br /><span class="lineno">31 </span> <span class="k">while</span> <span class="p">(</span><span class="o">!</span><span class="n">client</span><span class="p">.</span><span class="n">connected</span><span class="p">())</span> <span class="p">{</span><br /><span class="lineno">32 </span> <span class="n">String</span> <span class="n">client_id</span> <span class="o">=</span> <span class="s">"esp32-client-"</span><span class="p">;</span><br /><span class="lineno">33 </span> <span class="n">client_id</span> <span class="o">+=</span> <span class="n">String</span><span class="p">(</span><span class="n">WiFi</span><span class="p">.</span><span class="n">macAddress</span><span class="p">());</span><br /><span class="lineno">34 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">printf</span><span class="p">(</span><span class="s">"The client %s connects to the public MQTT broker</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">client_id</span><span class="p">.</span><span class="n">c_str</span><span class="p">());</span><br /><span class="lineno">35 </span> <span class="k">if</span> <span class="p">(</span><span class="n">client</span><span class="p">.</span><span class="n">connect</span><span class="p">(</span><span class="n">client_id</span><span class="p">.</span><span class="n">c_str</span><span class="p">(),</span> <span class="n">mqtt_username</span><span class="p">,</span> <span class="n">mqtt_password</span><span class="p">))</span> <span class="p">{</span><br /><span class="lineno">36 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="s">"Public EMQX MQTT broker connected"</span><span class="p">);</span><br /><span class="lineno">37 </span> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span><br /><span class="lineno">38 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">print</span><span class="p">(</span><span class="s">"failed with state "</span><span class="p">);</span><br /><span class="lineno">39 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">print</span><span class="p">(</span><span class="n">client</span><span class="p">.</span><span class="n">state</span><span class="p">());</span><br /><span class="lineno">40 </span> <span class="n">delay</span><span class="p">(</span><span class="mi">2000</span><span class="p">);</span><br /><span class="lineno">41 </span> <span class="p">}</span><br /><span class="lineno">42 </span> <span class="p">}</span><br /><span class="lineno">43 </span> <span class="c1">// Publish and subscribe</span><br /><span class="lineno">44 </span> <span class="n">client</span><span class="p">.</span><span class="n">publish</span><span class="p">(</span><span class="n">topic</span><span class="p">,</span> <span class="s">"Hi, I'm ESP32 ^^"</span><span class="p">);</span><br /><span class="lineno">45 </span> <span class="n">client</span><span class="p">.</span><span class="n">subscribe</span><span class="p">(</span><span class="n">topic</span><span class="p">);</span><br /><span class="lineno">46 </span><span class="p">}</span><br /><span class="lineno">47 </span><br /><span class="lineno">48 </span><span class="kt">void</span> <span class="nf">callback</span><span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="n">topic</span><span class="p">,</span> <span class="n">byte</span> <span class="o">*</span><span class="n">payload</span><span class="p">,</span> <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">length</span><span class="p">)</span> <span class="p">{</span><br /><span class="lineno">49 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">print</span><span class="p">(</span><span class="s">"Message arrived in topic: "</span><span class="p">);</span><br /><span class="lineno">50 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="n">topic</span><span class="p">);</span><br /><span class="lineno">51 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">print</span><span class="p">(</span><span class="s">"Message:"</span><span class="p">);</span><br /><span class="lineno">52 </span> <span class="k">for</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">length</span><span class="p">;</span> <span class="n">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span><br /><span class="lineno">53 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">print</span><span class="p">((</span><span class="kt">char</span><span class="p">)</span> <span class="n">payload</span><span class="p">[</span><span class="n">i</span><span class="p">]);</span><br /><span class="lineno">54 </span> <span class="p">}</span><br /><span class="lineno">55 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">println</span><span class="p">();</span><br /><span class="lineno">56 </span> <span class="n">Serial</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="s">"-----------------------"</span><span class="p">);</span><br /><span class="lineno">57 </span><span class="p">}</span><br /><span class="lineno">58 </span><br /><span class="lineno">59 </span><span class="kt">void</span> <span class="nf">loop</span><span class="p">()</span> <span class="p">{</span><br /><span class="lineno">60 </span> <span class="n">client</span><span class="p">.</span><span class="n">loop</span><span class="p">();</span><br /><span class="lineno">61 </span><span class="p">}</span><br /></pre></div></nowiki> ,
# Please follow these steps to upload the complete code using Arduino and power on the ESP32:
## Connect the ESP32 to your computer using a USB cable.
## Open the Arduino IDE and select the appropriate board and port from the "Tools" menu.
## Copy and paste the complete code into the Arduino IDE.
## Click the "Upload" button (or use the shortcut Ctrl+U) to compile and upload the code to the ESP32.
## Wait for the upload process to finish, ensuring there are no errors.
## Once the code is uploaded, disconnect the ESP32 from the computer.
## Power on the ESP32 by connecting it to a suitable power source.
# Open the serial monitor and set the baud rate to 115200. Then, check the connection status of the ESP32 by monitoring the output in the serial monitor.
# Use the MQTTX client to establish a connection with the MQTT broker and publish messages such as <code>Hi, I'm MQTTX</code> to the ESP32.
+, Ensure that the ESP32 dev library is installed, then go to libraries in the Arduino IDE and download PubSubClient. PubSub, short for Publish/Subscribe, is a messaging pattern where senders (publishers) distribute messages to receivers (subscribers) without directly communicating with them. Publishers send messages to a central hub (broker), which then distributes them to all interested subscribers based on their topic subscriptions. This is useful to conserve data when trying to share information, because rather than multiple different connections between the publisher and each subscriber, the publisher only needs to send the information once. +, …
To follow along with this tutorial, you will need the following components:
* An ESP32 board (I’m using the ESP32 DevKitC)
* The Arduino IDE installed on your computer
* The ESPAsyncWebServer and AsyncTCP libraries installed on your Arduino IDE
You can find the links to download the libraries and the complete code for this project at the end of this post. +, You must check out [https://www.pcbway.com/ PCBWAY] for ordering PCBs online for cheap!
You get 10 good-quality PCBs manufactured and shipped to your doorstep for cheap. You will also get a discount on shipping on your first order. Upload your Gerber files onto [https://www.pcbway.com/ PCBWAY] to get them manufactured with good quality and quick turnaround time. PCBWay now could provide a complete product solution, from design to enclosure production. Check out their online Gerber viewer function. With reward points, you can get free stuff from their gift shop. Also, check out this useful blog on PCBWay Plugin for KiCad from [https://www.pcbway.com/blog/News/PCBWay_Plug_In_for_KiCad_3ea6219c.html here]. Using this plugin, you can directly order PCBs in just one click after completing your design in KiCad. +, <nowiki>The basic idea of this project is to use a slider on a web page to send an HTTP request to the ESP32 with a value between 0 and 255, representing the LED's desired brightness. The ESP32 will then use that value to adjust the duty cycle of a PWM signal, which is a digital signal that switches between high and low states at a certain frequency. By changing the ratio of the high and low states, we can change the average voltage applied to the LED, and thus its brightness.<br /><br />The inbuilt LED is connected to GPIO2, which is one of the pins that supports PWM (Pulse Width Modulation). PWM is a technique that allows us to vary the brightness of the LED by changing the duty cycle of a digital signal. The ESP32 has 16 PWM channels that can be configured to different frequencies and resolutions. By using the <code>ledcSetup()</code> and <code>ledcWrite()</code> functions, we can set up a PWM channel for the inbuilt LED and write a value between 0 and 255 to adjust its brightness. We can also use the <code>Blink</code> example sketch from the Arduino IDE to make the inbuilt LED blink with a certain interval. The inbuilt LED is useful for testing and debugging purposes, as well as for creating simple projects that involve lighting effects.<br /><br />To create the web server, we will use the ESPAsyncWebServer library, which is an asynchronous web server library for the ESP32 and ESP8266. This library allows us to handle multiple web requests and responses without blocking the main loop of the ESP32, which can improve the performance and responsiveness of our web server. We will also use the AsyncTCP library, which is a dependency of the ESPAsyncWebServer library and provides low-level TCP communication between the ESP32 and the web browser.<br /><br />To create the web page, we will use HTML, CSS, and JavaScript. HTML is the markup language that defines the structure and content of the web page.<div class="mw-highlight mw-content-ltr" dir="ltr"><pre><span></span><span class="cp"><!DOCTYPE HTML></span><span class="p"><</span><span class="nt">html</span><span class="p">></span><br /><span class="p"><</span><span class="nt">head</span><span class="p">></span><br /> <span class="p"><</span><span class="nt">meta</span> <span class="na">name</span><span class="o">=</span><span class="s">"viewport"</span> <span class="na">content</span><span class="o">=</span><span class="s">"width=device-width, initial-scale=1"</span><span class="p">></span><br /> <span class="p"><</span><span class="nt">title</span><span class="p">></span>ESP32 PWM Controller<span class="p"></</span><span class="nt">title</span><span class="p">></span><br /><br /> <span class="p"><</span><span class="nt">style</span><span class="p">></span><br /> <span class="nt">html</span> <span class="p">{</span><span class="k">font-family</span><span class="p">:</span> <span class="n">Arial</span><span class="p">;</span> <span class="k">display</span><span class="p">:</span> <span class="kc">inline-block</span><span class="p">;</span> <span class="k">text-align</span><span class="p">:</span> <span class="kc">center</span><span class="p">;}</span><br /> <span class="nt">h2</span> <span class="p">{</span><span class="k">font-size</span><span class="p">:</span> <span class="mf">2.3</span><span class="kt">rem</span><span class="p">;}</span><br /> <span class="nt">p</span> <span class="p">{</span><span class="k">font-size</span><span class="p">:</span> <span class="mf">1.9</span><span class="kt">rem</span><span class="p">;}</span><br /> <span class="nt">body</span> <span class="p">{</span><span class="k">max-width</span><span class="p">:</span> <span class="mi">400</span><span class="kt">px</span><span class="p">;</span> <span class="k">margin</span><span class="p">:</span><span class="mi">0</span><span class="kt">px</span> <span class="kc">auto</span><span class="p">;</span> <span class="k">padding-bottom</span><span class="p">:</span> <span class="mi">25</span><span class="kt">px</span><span class="p">;}</span><br /> <span class="p">.</span><span class="nc">slider</span> <span class="p">{</span> <span class="kp">-webkit-</span><span class="k">appearance</span><span class="p">:</span> <span class="kc">none</span><span class="p">;</span> <span class="k">margin</span><span class="p">:</span> <span class="mi">14</span><span class="kt">px</span><span class="p">;</span> <span class="k">width</span><span class="p">:</span> <span class="mi">360</span><span class="kt">px</span><span class="p">;</span> <span class="k">height</span><span class="p">:</span> <span class="mi">25</span><span class="kt">px</span><span class="p">;</span> <span class="k">background</span><span class="p">:</span> <span class="mh">#2ad713</span><span class="p">;</span><br /> <span class="k">outline</span><span class="p">:</span> <span class="kc">none</span><span class="p">;</span> <span class="kp">-webkit-</span><span class="k">transition</span><span class="p">:</span> <span class="mf">.2</span><span class="kt">s</span><span class="p">;</span> <span class="k">transition</span><span class="p">:</span> <span class="k">opacity</span> <span class="mf">.2</span><span class="kt">s</span><span class="p">;}</span><br /> <span class="p">.</span><span class="nc">slider</span><span class="p">::</span><span class="nd">-webkit-slider-thumb</span> <span class="p">{</span><span class="kp">-webkit-</span><span class="k">appearance</span><span class="p">:</span> <span class="kc">none</span><span class="p">;</span> <span class="k">appearance</span><span class="p">:</span> <span class="kc">none</span><span class="p">;</span> <span class="k">width</span><span class="p">:</span> <span class="mi">35</span><span class="kt">px</span><span class="p">;</span> <span class="k">height</span><span class="p">:</span> <span class="mi">35</span><span class="kt">px</span><span class="p">;</span> <span class="k">background</span><span class="p">:</span> <span class="mh">#003249</span><span class="p">;</span> <span class="k">cursor</span><span class="p">:</span> <span class="kc">pointer</span><span class="p">;}</span><br /> <span class="p">.</span><span class="nc">slider</span><span class="p">::</span><span class="nd">-moz-range-thumb</span> <span class="p">{</span> <span class="k">width</span><span class="p">:</span> <span class="mi">35</span><span class="kt">px</span><span class="p">;</span> <span class="k">height</span><span class="p">:</span> <span class="mi">35</span><span class="kt">px</span><span class="p">;</span> <span class="k">background</span><span class="p">:</span> <span class="mh">#05abf8</span><span class="p">;</span> <span class="k">cursor</span><span class="p">:</span> <span class="kc">pointer</span><span class="p">;</span> <span class="p">}</span> <br /> <span class="p"></</span><span class="nt">style</span><span class="p">></span><br /> <br /><span class="p"></</span><span class="nt">head</span><span class="p">></span><br /><span class="p"><</span><span class="nt">body</span><span class="p">></span><br /> <span class="p"><</span><span class="nt">h2</span><span class="p">></span>ESP32 PWM Controller<span class="p"></</span><span class="nt">h2</span><span class="p">></span><br /> <span class="p"><</span><span class="nt">p</span><span class="p">><</span><span class="nt">span</span> <span class="na">id</span><span class="o">=</span><span class="s">"textSliderValue"</span><span class="p">></span>%SLIDERVALUE%<span class="p"></</span><span class="nt">span</span><span class="p">></</span><span class="nt">p</span><span class="p">></span><br /> <span class="p"><</span><span class="nt">p</span><span class="p">><</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">"range"</span> <span class="na">onchange</span><span class="o">=</span><span class="s">"updateSliderPWM(this)"</span> <span class="na">id</span><span class="o">=</span><span class="s">"pwmSlider"</span> <span class="na">min</span><span class="o">=</span><span class="s">"0"</span> <span class="na">max</span><span class="o">=</span><span class="s">"255"</span> <span class="na">value</span><span class="o">=</span><span class="s">"%SLIDERVALUE%"</span> <span class="na">step</span><span class="o">=</span><span class="s">"1"</span> <span class="na">class</span><span class="o">=</span><span class="s">"slider"</span><span class="p">></</span><span class="nt">p</span><span class="p">></span><br /><span class="p"><</span><span class="nt">script</span><span class="p">></span><br /><span class="kd">function</span> <span class="nx">updateSliderPWM</span><span class="p">(</span><span class="nx">element</span><span class="p">)</span> <span class="p">{</span><br /> <span class="kd">var</span> <span class="nx">sliderValue</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s2">"pwmSlider"</span><span class="p">).</span><span class="nx">value</span><span class="p">;</span><br /> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s2">"textSliderValue"</span><span class="p">).</span><span class="nx">innerHTML</span> <span class="o">=</span> <span class="nx">sliderValue</span><span class="p">;</span><br /> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">sliderValue</span><span class="p">);</span><br /> <span class="kd">var</span> <span class="nx">xhr</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">XMLHttpRequest</span><span class="p">();</span><br /> <span class="nx">xhr</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="s2">"GET"</span><span class="p">,</span> <span class="s2">"/slider?value="</span><span class="o">+</span><span class="nx">sliderValue</span><span class="p">,</span> <span class="kc">true</span><span class="p">);</span><br /> <span class="nx">xhr</span><span class="p">.</span><span class="nx">send</span><span class="p">();</span><br /><span class="p">}</span><br /><span class="p"></</span><span class="nt">script</span><span class="p">></span><br /><span class="p"></</span><span class="nt">body</span><span class="p">></span><br /><span class="p"></</span><span class="nt">html</span><span class="p">></span><br /></pre></div>CSS is the style sheet language that defines the appearance and layout of the web page. JavaScript is the scripting language that adds interactivity and functionality to the web page. In this project, we will use JavaScript to capture the slider's value and send it to the ESP32 via an HTTP GET request.<div class="mw-highlight mw-content-ltr" dir="ltr"><pre><span></span><span class="cp">#include</span> <span class="cpf"><WiFi.h></span><span class="cp"></span><br /><span class="cp">#include</span> <span class="cpf"><AsyncTCP.h></span><span class="cp"></span><br /><span class="cp">#include</span> <span class="cpf"><ESPAsyncWebServer.h></span><span class="cp"></span><br /><br /><span class="c1">// Replace with your network credentials</span><br /><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">ssid</span> <span class="o">=</span> <span class="s">"ELDRADO"</span><span class="p">;</span><br /><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">password</span> <span class="o">=</span> <span class="s">"amazon123"</span><span class="p">;</span><br /><br /><span class="k">const</span> <span class="kt">int</span> <span class="n">output</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span><br /><br /><span class="n">String</span> <span class="n">sliderValue</span> <span class="o">=</span> <span class="s">"0"</span><span class="p">;</span><br /><br /><span class="c1">// setting PWM properties</span><br /><span class="k">const</span> <span class="kt">int</span> <span class="n">freq</span> <span class="o">=</span> <span class="mi">5000</span><span class="p">;</span><br /><span class="k">const</span> <span class="kt">int</span> <span class="n">ledChannel</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span><br /><span class="k">const</span> <span class="kt">int</span> <span class="n">resolution</span> <span class="o">=</span> <span class="mi">8</span><span class="p">;</span><br /><br /><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">PARAM_INPUT</span> <span class="o">=</span> <span class="s">"value"</span><span class="p">;</span><br /><br /><span class="c1">// Create AsyncWebServer object on port 80</span><br /><span class="n">AsyncWebServer</span> <span class="nf">server</span><span class="p">(</span><span class="mi">80</span><span class="p">);</span><br /><br /><span class="k">const</span> <span class="kt">char</span> <span class="n">index_html</span><span class="p">[]</span> <span class="n">PROGMEM</span> <span class="o">=</span> <span class="n">R</span><span class="s">"rawliteral(</span><br /><span class="o"><!</span><span class="n">DOCTYPE</span> <span class="n">HTML</span><span class="o">><</span><span class="n">html</span><span class="o">></span><br /><span class="o"><</span><span class="n">head</span><span class="o">></span><br /> <span class="o"><</span><span class="n">meta</span> <span class="n">name</span><span class="o">=</span><span class="s">"viewport"</span> <span class="n">content</span><span class="o">=</span><span class="s">"width=device-width, initial-scale=1"</span><span class="o">></span><br /> <span class="o"><</span><span class="n">title</span><span class="o">></span><span class="n">ESP32</span> <span class="n">PWM</span> <span class="n">Controller</span><span class="o"></</span><span class="n">title</span><span class="o">></span><br /><br /> <span class="o"><</span><span class="n">style</span><span class="o">></span><br /> <span class="n">html</span> <span class="p">{</span><span class="n">font</span><span class="o">-</span><span class="nl">family</span><span class="p">:</span> <span class="n">Arial</span><span class="p">;</span> <span class="nl">display</span><span class="p">:</span> <span class="kr">inline</span><span class="o">-</span><span class="n">block</span><span class="p">;</span> <span class="n">text</span><span class="o">-</span><span class="nl">align</span><span class="p">:</span> <span class="n">center</span><span class="p">;}</span><br /> <span class="n">h2</span> <span class="p">{</span><span class="n">font</span><span class="o">-</span><span class="nl">size</span><span class="p">:</span> <span class="mf">2.3</span><span class="n">rem</span><span class="p">;}</span><br /> <span class="n">p</span> <span class="p">{</span><span class="n">font</span><span class="o">-</span><span class="nl">size</span><span class="p">:</span> <span class="mf">1.9</span><span class="n">rem</span><span class="p">;}</span><br /> <span class="n">body</span> <span class="p">{</span><span class="n">max</span><span class="o">-</span><span class="nl">width</span><span class="p">:</span> <span class="mi">400</span><span class="n">px</span><span class="p">;</span> <span class="nl">margin</span><span class="p">:</span><span class="mi">0</span><span class="n">px</span> <span class="k">auto</span><span class="p">;</span> <span class="n">padding</span><span class="o">-</span><span class="nl">bottom</span><span class="p">:</span> <span class="mi">25</span><span class="n">px</span><span class="p">;}</span><br /> <span class="p">.</span><span class="n">slider</span> <span class="p">{</span> <span class="o">-</span><span class="n">webkit</span><span class="o">-</span><span class="nl">appearance</span><span class="p">:</span> <span class="n">none</span><span class="p">;</span> <span class="nl">margin</span><span class="p">:</span> <span class="mi">14</span><span class="n">px</span><span class="p">;</span> <span class="nl">width</span><span class="p">:</span> <span class="mi">360</span><span class="n">px</span><span class="p">;</span> <span class="nl">height</span><span class="p">:</span> <span class="mi">25</span><span class="n">px</span><span class="p">;</span> <span class="nl">background</span><span class="p">:</span> <span class="err">#</span><span class="mi">2</span><span class="n">ad713</span><span class="p">;</span><br /> <span class="nl">outline</span><span class="p">:</span> <span class="n">none</span><span class="p">;</span> <span class="o">-</span><span class="n">webkit</span><span class="o">-</span><span class="nl">transition</span><span class="p">:</span> <span class="mf">.2</span><span class="n">s</span><span class="p">;</span> <span class="nl">transition</span><span class="p">:</span> <span class="n">opacity</span> <span class="mf">.2</span><span class="n">s</span><span class="p">;}</span><br /> <span class="p">.</span><span class="n">slider</span><span class="o">::-</span><span class="n">webkit</span><span class="o">-</span><span class="n">slider</span><span class="o">-</span><span class="n">thumb</span> <span class="p">{</span><span class="o">-</span><span class="n">webkit</span><span class="o">-</span><span class="nl">appearance</span><span class="p">:</span> <span class="n">none</span><span class="p">;</span> <span class="nl">appearance</span><span class="p">:</span> <span class="n">none</span><span class="p">;</span> <span class="nl">width</span><span class="p">:</span> <span class="mi">35</span><span class="n">px</span><span class="p">;</span> <span class="nl">height</span><span class="p">:</span> <span class="mi">35</span><span class="n">px</span><span class="p">;</span> <span class="nl">background</span><span class="p">:</span> <span class="err">#</span><span class="mo">00324</span><span class="mi">9</span><span class="p">;</span> <span class="nl">cursor</span><span class="p">:</span> <span class="n">pointer</span><span class="p">;}</span><br /> <span class="p">.</span><span class="n">slider</span><span class="o">::-</span><span class="n">moz</span><span class="o">-</span><span class="n">range</span><span class="o">-</span><span class="n">thumb</span> <span class="p">{</span> <span class="nl">width</span><span class="p">:</span> <span class="mi">35</span><span class="n">px</span><span class="p">;</span> <span class="nl">height</span><span class="p">:</span> <span class="mi">35</span><span class="n">px</span><span class="p">;</span> <span class="nl">background</span><span class="p">:</span> <span class="err">#</span><span class="mo">05</span><span class="n">abf8</span><span class="p">;</span> <span class="nl">cursor</span><span class="p">:</span> <span class="n">pointer</span><span class="p">;</span> <span class="p">}</span> <br /> <span class="o"></</span><span class="n">style</span><span class="o">></span><br /> <br /><span class="o"></</span><span class="n">head</span><span class="o">></span><br /><span class="o"><</span><span class="n">body</span><span class="o">></span><br /> <span class="o"><</span><span class="n">h2</span><span class="o">></span><span class="n">ESP32</span> <span class="n">PWM</span> <span class="n">Controller</span><span class="o"></</span><span class="n">h2</span><span class="o">></span><br /> <span class="o"><</span><span class="n">p</span><span class="o">><</span><span class="n">span</span> <span class="n">id</span><span class="o">=</span><span class="s">"textSliderValue"</span><span class="o">>%</span><span class="n">SLIDERVALUE</span><span class="o">%</</span><span class="n">span</span><span class="o">></</span><span class="n">p</span><span class="o">></span><br /> <span class="o"><</span><span class="n">p</span><span class="o">><</span><span class="n">input</span> <span class="n">type</span><span class="o">=</span><span class="s">"range"</span> <span class="n">onchange</span><span class="o">=</span><span class="s">"updateSliderPWM(this)"</span> <span class="n">id</span><span class="o">=</span><span class="s">"pwmSlider"</span> <span class="n">min</span><span class="o">=</span><span class="s">"0"</span> <span class="n">max</span><span class="o">=</span><span class="s">"255"</span> <span class="n">value</span><span class="o">=</span><span class="s">"%SLIDERVALUE%"</span> <span class="n">step</span><span class="o">=</span><span class="s">"1"</span> <span class="n">class</span><span class="o">=</span><span class="s">"slider"</span><span class="o">></</span><span class="n">p</span><span class="o">></span><br /><span class="o"><</span><span class="n">script</span><span class="o">></span><br /><span class="n">function</span> <span class="n">updateSliderPWM</span><span class="p">(</span><span class="n">element</span><span class="p">)</span> <span class="p">{</span><br /> <span class="n">var</span> <span class="n">sliderValue</span> <span class="o">=</span> <span class="n">document</span><span class="p">.</span><span class="n">getElementById</span><span class="p">(</span><span class="s">"pwmSlider"</span><span class="p">).</span><span class="n">value</span><span class="p">;</span><br /> <span class="n">document</span><span class="p">.</span><span class="n">getElementById</span><span class="p">(</span><span class="s">"textSliderValue"</span><span class="p">).</span><span class="n">innerHTML</span> <span class="o">=</span> <span class="n">sliderValue</span><span class="p">;</span><br /> <span class="n">console</span><span class="p">.</span><span class="n">log</span><span class="p">(</span><span class="n">sliderValue</span><span class="p">);</span><br /> <span class="n">var</span> <span class="n">xhr</span> <span class="o">=</span> <span class="n">new</span> <span class="n">XMLHttpRequest</span><span class="p">();</span><br /> <span class="n">xhr</span><span class="p">.</span><span class="n">open</span><span class="p">(</span><span class="s">"GET"</span><span class="p">,</span> <span class="s">"/slider?value="</span><span class="o">+</span><span class="n">sliderValue</span><span class="p">,</span> <span class="nb">true</span><span class="p">);</span><br /> <span class="n">xhr</span><span class="p">.</span><span class="n">send</span><span class="p">();</span><br /><span class="p">}</span><br /><span class="o"></</span><span class="n">script</span><span class="o">></span><br /><span class="o"></</span><span class="n">body</span><span class="o">></span><br /><span class="o"></</span><span class="n">html</span><span class="o">></span><br /><span class="p">)</span><span class="n">rawliteral</span><span class="s">";</span><br /><br /><span class="c1">// Replaces placeholder with button section in your web page</span><br /><span class="n">String</span> <span class="nf">processor</span><span class="p">(</span><span class="k">const</span> <span class="n">String</span><span class="o">&</span> <span class="n">var</span><span class="p">){</span><br /> <span class="c1">//Serial.println(var);</span><br /> <span class="k">if</span> <span class="p">(</span><span class="n">var</span> <span class="o">==</span> <span class="s">"SLIDERVALUE"</span><span class="p">){</span><br /> <span class="k">return</span> <span class="n">sliderValue</span><span class="p">;</span><br /> <span class="p">}</span><br /> <span class="k">return</span> <span class="n">String</span><span class="p">();</span><br /><span class="p">}</span><br /><br /><span class="kt">void</span> <span class="nf">setup</span><span class="p">(){</span><br /> <span class="c1">// Serial port for debugging purposes</span><br /> <span class="n">Serial</span><span class="p">.</span><span class="n">begin</span><span class="p">(</span><span class="mi">115200</span><span class="p">);</span><br /> <br /> <span class="c1">// configure LED PWM functionalitites</span><br /> <span class="n">ledcSetup</span><span class="p">(</span><span class="n">ledChannel</span><span class="p">,</span> <span class="n">freq</span><span class="p">,</span> <span class="n">resolution</span><span class="p">);</span><br /> <br /> <span class="c1">// attach the channel to the GPIO to be controlled</span><br /> <span class="n">ledcAttachPin</span><span class="p">(</span><span class="n">output</span><span class="p">,</span> <span class="n">ledChannel</span><span class="p">);</span><br /> <br /> <span class="n">ledcWrite</span><span class="p">(</span><span class="n">ledChannel</span><span class="p">,</span> <span class="n">sliderValue</span><span class="p">.</span><span class="n">toInt</span><span class="p">());</span><br /><br /> <span class="c1">// Connect to Wi-Fi</span><br /> <span class="n">WiFi</span><span class="p">.</span><span class="n">begin</span><span class="p">(</span><span class="n">ssid</span><span class="p">,</span> <span class="n">password</span><span class="p">);</span><br /> <span class="k">while</span> <span class="p">(</span><span class="n">WiFi</span><span class="p">.</span><span class="n">status</span><span class="p">()</span> <span class="o">!=</span> <span class="n">WL_CONNECTED</span><span class="p">)</span> <span class="p">{</span><br /> <span class="n">delay</span><span class="p">(</span><span class="mi">1000</span><span class="p">);</span><br /> <span class="n">Serial</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="s">"Connecting to WiFi.."</span><span class="p">);</span><br /> <span class="p">}</span><br /><br /> <span class="c1">// Print ESP Local IP Address</span><br /> <span class="n">Serial</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="n">WiFi</span><span class="p">.</span><span class="n">localIP</span><span class="p">());</span><br /><br /> <span class="c1">// Route for root / web page</span><br /> <span class="n">server</span><span class="p">.</span><span class="n">on</span><span class="p">(</span><span class="s">"/"</span><span class="p">,</span> <span class="n">HTTP_GET</span><span class="p">,</span> <span class="p">[](</span><span class="n">AsyncWebServerRequest</span> <span class="o">*</span><span class="n">request</span><span class="p">){</span><br /> <span class="n">request</span><span class="o">-></span><span class="n">send_P</span><span class="p">(</span><span class="mi">200</span><span class="p">,</span> <span class="s">"text/html"</span><span class="p">,</span> <span class="n">index_html</span><span class="p">,</span> <span class="n">processor</span><span class="p">);</span><br /> <span class="p">});</span><br /><br /> <span class="c1">// Send a GET request to <ESP_IP>/slider?value=<inputMessage></span><br /> <span class="n">server</span><span class="p">.</span><span class="n">on</span><span class="p">(</span><span class="s">"/slider"</span><span class="p">,</span> <span class="n">HTTP_GET</span><span class="p">,</span> <span class="p">[]</span> <span class="p">(</span><span class="n">AsyncWebServerRequest</span> <span class="o">*</span><span class="n">request</span><span class="p">)</span> <span class="p">{</span><br /> <span class="n">String</span> <span class="n">inputMessage</span><span class="p">;</span><br /> <span class="c1">// GET input1 value on <ESP_IP>/slider?value=<inputMessage></span><br /> <span class="k">if</span> <span class="p">(</span><span class="n">request</span><span class="o">-></span><span class="n">hasParam</span><span class="p">(</span><span class="n">PARAM_INPUT</span><span class="p">))</span> <span class="p">{</span><br /> <span class="n">inputMessage</span> <span class="o">=</span> <span class="n">request</span><span class="o">-></span><span class="n">getParam</span><span class="p">(</span><span class="n">PARAM_INPUT</span><span class="p">)</span><span class="o">-></span><span class="n">value</span><span class="p">();</span><br /> <span class="n">sliderValue</span> <span class="o">=</span> <span class="n">inputMessage</span><span class="p">;</span><br /> <span class="n">ledcWrite</span><span class="p">(</span><span class="n">ledChannel</span><span class="p">,</span> <span class="n">sliderValue</span><span class="p">.</span><span class="n">toInt</span><span class="p">());</span><br /> <span class="p">}</span><br /> <span class="k">else</span> <span class="p">{</span><br /> <span class="n">inputMessage</span> <span class="o">=</span> <span class="s">"No message sent"</span><span class="p">;</span><br /> <span class="p">}</span><br /> <span class="n">Serial</span><span class="p">.</span><span class="n">println</span><span class="p">(</span><span class="n">inputMessage</span><span class="p">);</span><br /> <span class="n">request</span><span class="o">-></span><span class="n">send</span><span class="p">(</span><span class="mi">200</span><span class="p">,</span> <span class="s">"text/plain"</span><span class="p">,</span> <span class="s">"OK"</span><span class="p">);</span><br /> <span class="p">});</span><br /> <br /> <span class="c1">// Start server</span><br /> <span class="n">server</span><span class="p">.</span><span class="n">begin</span><span class="p">();</span><br /><span class="p">}</span><br /> <br /><span class="kt">void</span> <span class="nf">loop</span><span class="p">()</span> <span class="p">{</span><br /> <br /><span class="p">}</span><br /></pre></div></nowiki> , …
WebSerial is a web standard that allows websites to communicate with serial devices. It bridges the web and the physical world, enabling web applications to interact with hardware devices. This opens up a world of possibilities for IoT projects, allowing real-time interaction between web applications and physical devices. +, You must check out [https://www.pcbway.com/ PCBWAY] for ordering PCBs online for cheap!
You get 10 good-quality PCBs manufactured and shipped to your doorstep for cheap. You will also get a discount on shipping on your first order. Upload your Gerber files onto [https://www.pcbway.com/ PCBWAY] to get them manufactured with good quality and quick turnaround time. PCBWay now could provide a complete product solution, from design to enclosure production. Check out their online Gerber viewer function. With reward points, you can get free stuff from their gift shop. Also, check out this useful blog on PCBWay Plugin for KiCad from [https://www.pcbway.com/blog/News/PCBWay_Plug_In_for_KiCad_3ea6219c.html here. U]sing this plugin, you can directly order PCBs in just one click after completing your design in KiCad. +, Before we can use WebSerial with the ESP32, we need to set up the ESP32 development environment. Here are the steps:
* '''Install the Arduino IDE''': The Arduino IDE is a popular platform for writing and uploading code to the ESP32. You can download it from the official Arduino website.
* '''Install the ESP32 Board in Arduino IDE''': You can add the ESP32 board to the Arduino IDE by going to <code>'''File > Preferences > Additional Boards Manager URLs'''</code> and adding the ESP32 board manager URL. This will allow the Arduino IDE to recognize the ESP32 board and provide the appropriate options for programming it.
* '''Select the ESP32 Board''': Go to <code>'''Tools > Board > ESP32 Arduino'''</code> and select your ESP32 board. This tells the Arduino IDE that you will be programming an ESP32 board. +, …
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percer à l'aide de la scie cloche +, avec la meuleuse et un disque à tronçonner:
*couper dans le tube de 1pouce deux longueurs de 2m 10
* couper dans le tube de 1/2 pouces 7 morceaux de 52cm
avec le disque à meuler ébarber les extrémités +, A l'aide d'une cornière tracer un axe sur les deux tubes de 2m10 qui permettra d'aligner les trous +
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