用esp8266与esp01s用espnow通讯的代码

以下是使用ESP8266和ESP-01S利用ESP-NOW进行通信的示例代码：

发送数据的ESP8266代码：

#include <ESP8266WiFi.h>
#include <espnow.h>

// Replace with the MAC address of the receiving ESP-01S module
uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

// Callback function that will be executed when data is sent
void OnDataSent(uint8_t *mac_addr, uint8_t status) {
  Serial.print("Packet sent to: ");
  for (int i = 0; i < 6; i++) {
    Serial.print(mac_addr[i], HEX);
    if (i != 5) {
      Serial.print(":");
    }
  }
  Serial.print(" Status: ");
  Serial.println(status);
}

void setup() {
  Serial.begin(115200);

  // Initialize ESP-NOW
  if (esp_now_init() != 0) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  // Register the callback function
  esp_now_set_self_role(ESP_NOW_ROLE_CONTROLLER);
  esp_now_register_send_cb(OnDataSent);

  // Add the receiving ESP-01S module as a peer
  esp_now_add_peer(broadcastAddress, ESP_NOW_ROLE_SLAVE, 1, NULL, 0);
}

void loop() {
  // Send data to the receiving ESP-01S module
  String message = "Hello from ESP8266!";
  uint8_t data[message.length() + 1];
  message.getBytes(data, message.length() + 1);
  esp_now_send(broadcastAddress, data, message.length() + 1);
  delay(1000);
}

接收数据的ESP-01S代码：

#include <ESP8266WiFi.h>
#include <espnow.h>

// Replace with the MAC address of the receiving ESP8266 module
uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

void OnDataReceived(uint8_t *mac_addr, uint8_t *data, uint8_t len) {
  Serial.print("Data received from: ");
  for (int i = 0; i < 6; i++) {
    Serial.print(mac_addr[i], HEX);
    if (i != 5) {
      Serial.print(":");
    }
  }
  Serial.print(" Data: ");
  Serial.write(data, len);
  Serial.println();
}

void setup() {
  Serial.begin(115200);

  // Initialize ESP-NOW
  if (esp_now_init() != 0) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  // Register the callback function
  esp_now_set_self_role(ESP_NOW_ROLE_SLAVE);
  esp_now_register_recv_cb(OnDataReceived);

  // Add the sending ESP8266 module as a peer
  esp_now_add_peer(broadcastAddress, ESP_NOW_ROLE_CONTROLLER, 1, NULL, 0);
}

void loop() {
  // Do nothing
}

在以上代码中，需要将发送ESP8266和接收ESP-01S的MAC地址替换为实际的地址。此外，还需要在发送ESP8266中将数据转换为字节数组，并在接收ESP-01S中使用Serial.write()函数来打印接收到的数据。