ESP32 接收温湿度信息通过串口通信传输给ESP8266mqtt上次阿里云的代码

以下是 ESP32 接收温湿度信息并通过串口通信传输给 ESP8266，最终发送到阿里云的示例代码：

#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <WiFi.h>
#include <PubSubClient.h>

// DHT11传感器引脚定义
#define DHTPIN 18

// DHT11传感器类型
#define DHTTYPE DHT11

// WiFi 接入点名称和密码
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// MQTT Broker 地址和端口
const char* broker = "your_BROKER_ADDRESS";
const int port = your_BROKER_PORT;

// MQTT 订阅主题和发布主题
const char* subscribeTopic = "your_topic/sub";
const char* publishTopic = "your_topic/pub";

// 创建 WiFi 客户端
WiFiClient wifiClient;

// 创建 MQTT 客户端
PubSubClient mqttClient(wifiClient);

// 创建 DHT11 对象
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  // 初始化串口
  Serial.begin(115200);

  // 初始化 DHT11 传感器
  dht.begin();

  // 连接 WiFi 网络
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("WiFi connected.");

  // 连接 MQTT Broker
  mqttClient.setServer(broker, port);
  while (!mqttClient.connected()) {
    Serial.println("Connecting to MQTT Broker...");
    if (mqttClient.connect("ESP32Client")) {
      Serial.println("MQTT Broker connected.");
      mqttClient.subscribe(subscribeTopic);
    } else {
      Serial.print("Failed, rc=");
      Serial.print(mqttClient.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void loop() {
  // 读取温湿度数据
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // 如果读取失败，则重试
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    delay(2000);
    return;
  }

  // 将温湿度数据输出到串口
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print("%\t");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");

  // 将温湿度数据转换为 JSON 格式
  String payload = "{\"humidity\":" + String(humidity) + ",\"temperature\":" + String(temperature) + "}";

  // 将温湿度数据发布到 MQTT Broker
  mqttClient.publish(publishTopic, payload.c_str());

  // 等待 5 秒
  delay(5000);
}

请替换代码中的 WiFi 接入点名称和密码、MQTT Broker 地址和端口、订阅主题和发布主题，然后将代码分别上传到 ESP32 和 ESP8266 上即可。