Getting Started with ESP-NOW

Will guide you to communicate between ESP32 controllers by using ESP NOW protocol.

Difficulté

Easy Facile

Durée

1 hour(s) heure(s)

Catégories

Électronique

Coût

10 USD ($)

ESP 32, ESP-NOW, Iot, Microcontrollers Getting_Started_with_ESP-NOW_1.PNG Technique

Introduction

ESP-NOW is a wireless communication protocol based on the data-link layer that enables the direct, quick, and low-power control of smart devices without the need for a router. Espressif defines it and can work with Wi-Fi and Bluetooth LE. ESP-NOW provides flexible and low-power data transmission to all interconnected devices. It can also be used as an independent protocol that helps with device provisioning, debugging, and firmware upgrades.

ESP-NOW is a connectionless communication protocol developed by Espressif that features short packet transmission. This protocol enables multiple devices to talk to each other in an easy way. It is a fast communication protocol that can be used to exchange small messages (up to 250 bytes) between ESP32 or ESP8266 boards. ESP-NOW supports the following features: Encrypted and unencrypted unicast communication; Mixed encrypted and unencrypted peer devices; Up to 250-byte payload can be carried; Sending callback function that can be set to inform the application layer of transmission success or failure.

Matériaux

Outils

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Étape 2 - How is it different from existing protocols?

ESP-NOW is a wireless communication protocol that is different from Wi-Fi and Bluetooth in that it reduces the five layers of the OSI model to only one1. Additionally, ESP-NOW occupies fewer CPU and flash resources than traditional connection protocols while co-exists with Wi-Fi and Bluetooth LE.

Bluetooth is used to connect short-range devices for sharing information, while Wi-Fi is used for providing high-speed internet access2. Wi-Fi provides high bandwidth because the speed of the internet is an important issue.

Max Distance:

The range of ESP-NOW is up to 480 meters when using the ESP-NOW protocol for bridging between multiple ESP32s1. The range can be further increased by enabling long-range ESP-NOW. When enabled, the PHY rate of ESP32 will be 512Kbps or 256Kbps.

Maximum nodes:

ESP-NOW supports various series of Espressif chips, providing a flexible data transmission that is suitable for connecting “one-to-many” and “many-to-many” devices.

Applications:

ESP-NOW is widely used in

• smart-home appliances,
• remote controlling,
• sensors, etc.

In this tutorial, will see how to implement a basic ESP NOW communication between ESP32 Microcontrollers.

Étape 3 - Setting Up the Receiver

ESPNOW communication works based on the MAC address of the nodes. So, we need to find the Mac address of our slave or receiver node.

]For that just upload the following sketch to the ESP32 board and look for the Mac address in the serial monitor.

#include "WiFi.h"
 
void setup(){
  Serial.begin(115200);
  WiFi.mode(WIFI_MODE_STA);
  Serial.println(WiFi.macAddress());
}
 
void loop(){
}

Once you uploaded the code, press the EN button and wait for the serial monitor results. It will show you the Mac address. Note that.

Étape 4 - Setting Up the Transmitter

Next, we need to prepare the transmitter, for that use this example sketch which can send multiple data types of data to the particular slave node.

  
  // Register peer
  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  peerInfo.channel = 0;  
  peerInfo.encrypt = false;
  
  // Add peer        
  if (esp_now_add_peer(&peerInfo) != ESP_OK){
    Serial.println("Failed to add peer");
    return;
  }
}
 
void loop() {
  // Set values to send
  strcpy(myData.a, "I'm alive");
  myData.b = random(1,20);
  myData.c = 1.2;
  myData.d = false;
  
  // Send message via ESP-NOW
  esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
   
  if (result == ESP_OK) {
    Serial.println("Sent with success");
  }
  else {
    Serial.println("Error sending the data");
  }
  delay(2000);
}

Note: Change the Mac Address here

Here are the serial monitor results, it show sent success but not delivered. Because we don't have the receiver.

Let's try to implement the receiver.

Étape 5 - Testing the Connection

With the help of below example sketch, you can receive the data from the master and it will print that into the serial monitor.

#include <esp_now.h>
#include <WiFi.h>

// Structure example to receive data
typedef struct struct_message {
    char a[32];
    int b;
    float c;
    bool d;
} struct_message;

// Create a struct_message called myData
struct_message myData;

// callback function that will be executed when data is received
void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
  memcpy(&myData, incomingData, sizeof(myData));
  Serial.print("Bytes received: ");
  Serial.println(len);
  Serial.print("Char: ");
  Serial.println(myData.a);
  Serial.print("Int: ");
  Serial.println(myData.b);
  Serial.print("Float: ");
  Serial.println(myData.c);
  Serial.print("Bool: ");
  Serial.println(myData.d);
  Serial.println();
}
 
void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  
  // Set device as a Wi-Fi Station
  WiFi.mode(WIFI_STA);

  // Init ESP-NOW
  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }
  
  // get recv packer info
  esp_now_register_recv_cb(OnDataRecv);
}
 
void loop() {

}

Serial monitor results.

Étape 6 - Wrap Up:

We have seen how to implement the ESP NOW in ESP32 microcontroller, in upcoming tutorials will see how to transmit sensor data via ESPNOW.

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