Cette page fournit une simple interface de navigation pour trouver des entités décrites par une propriété et une valeur nommée. D’autres interfaces de recherche disponibles comprennent la page recherche de propriété, et le constructeur de requêtes ask.
import machine
import time
import urequests
import network
# Wi-Fi credentials
ssid = 'wifi_name' #input your own wifi name
password = 'password' #input your own password
# IFTTT webhook key
api_key = 'your_own_key' #input your own key
# Connect to Wi-Fi
station = network.WLAN(network.STA_IF)
station.active(True)
station.connect(ssid, password)
while station.isconnected() == False:
pass
print('Connection successful')
print(station.ifconfig())
# Set up ultrasonic sensor
trigger = machine.Pin(4, machine.Pin.OUT)
echo = machine.Pin(5, machine.Pin.IN)
def main():
while True:
# Send trigger pulse
trigger.value(0)
time.sleep_us(5)
trigger.value(1)
time.sleep_us(10)
trigger.value(0)
# Measure duration of echo pulse
while echo.value() == 0:
start = time.ticks_us()
while echo.value() == 1:
end = time.ticks_us()
duration = time.ticks_diff(end, start)
# Calculate distance
distance = duration * 0.034 / 2
# Send data to IFTTT
data = {'value1': distance}
submitData("ultrasonic_distance", data)
# Delay before next measurement
time.sleep(5)
def submitData(event, data):
try:
print('Sending data to IFTTT:', data)
request_headers = {'Content-Type': 'application/json'}
request = urequests.post(
'https://maker.ifttt.com/trigger/'+ event + '/with/key/' + api_key,
json=data,headers=request_headers)
print(request.text)
request.close()
except OSError as e:
print('Failed to send data to IFTTT.', e)
if __name__ == '__main__':
main()
1 #include
2 #include
3
4 // WiFi
5 const char *ssid = "xxxxx"; // Enter your Wi-Fi name
6 const char *password = "xxxxx"; // Enter Wi-Fi password
7
8 // MQTT Broker
9 const char *mqtt_broker = "broker.emqx.io";
10 const char *topic = "emqx/esp32";
11 const char *mqtt_username = "emqx";
12 const char *mqtt_password = "public";
13 const int mqtt_port = 1883;
14
15 WiFiClient espClient;
16 PubSubClient client(espClient);
17
18 void setup() {
19 // Set software serial baud to 115200;
20 Serial.begin(115200);
21 // Connecting to a WiFi network
22 WiFi.begin(ssid, password);
23 while (WiFi.status() != WL_CONNECTED) {
24 delay(500);
25 Serial.println("Connecting to WiFi..");
26 }
27 Serial.println("Connected to the Wi-Fi network");
28 //connecting to a mqtt broker
29 client.setServer(mqtt_broker, mqtt_port);
30 client.setCallback(callback);
31 while (!client.connected()) {
32 String client_id = "esp32-client-";
33 client_id += String(WiFi.macAddress());
34 Serial.printf("The client %s connects to the public MQTT broker\n", client_id.c_str());
35 if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
36 Serial.println("Public EMQX MQTT broker connected");
37 } else {
38 Serial.print("failed with state ");
39 Serial.print(client.state());
40 delay(2000);
41 }
42 }
43 // Publish and subscribe
44 client.publish(topic, "Hi, I'm ESP32 ^^");
45 client.subscribe(topic);
46 }
47
48 void callback(char *topic, byte *payload, unsigned int length) {
49 Serial.print("Message arrived in topic: ");
50 Serial.println(topic);
51 Serial.print("Message:");
52 for (int i = 0; i < length; i++) {
53 Serial.print((char) payload[i]);
54 }
55 Serial.println();
56 Serial.println("-----------------------");
57 }
58
59 void loop() {
60 client.loop();
61 }
[EXAMPLE] When a '''user1''' publishes an image on social media, then only the '''user2''' subscribed to '''user1''' can view/receive the image. Here, the '''user1''' is the '''PUBLISHER''', '''user2''' is the '''SUBSCRIBER''', and the '''user1's account''' is the '''BROKER'''.* According to the above analogy, the image that is published is the data, that was '''transferred from user1 to user2''' 📤. And that is the exact scenario in an MQTT Pub/Sub model. * We have a more secure layer 🔒 to make sure the data is shared t'''hrough a specific path, we call th'''at 'topic', When use'''r1''' publishes data on topic, the subscriber automatically receives if already connected to the broker. Hence, t'''he''' LOW latency.connected to the broker. Hence, t'''he''' LOW latency.)
Username is casaos, and the password is also same.CasaOS fully supports Raspberry Pi. Also, more computers and development boards and fully compatible with Ubuntu, Debian, Raspberry Pi OS, and CentOS with one-liner installation.spberry Pi OS, and CentOS with one-liner installation.)
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