基于Arduino IDE的ESP8266模块读取DHT11温湿度并上传至阿里云代码

以下是基于Arduino IDE的ESP8266模块读取DHT11温湿度并上传至阿里云的示例代码，其中包含了一些必要的库和变量设置，请根据自己的实际需求进行修改：

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <DHT.h>

// WiFi参数
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// MQTT服务器参数
const char* mqtt_server = "your_MQTT_SERVER";
const int mqtt_port = 1883;
const char* mqtt_user = "your_MQTT_USERNAME";
const char* mqtt_password = "your_MQTT_PASSWORD";

// 阿里云产品参数
const char* productKey = "your_PRODUCT_KEY";
const char* deviceName = "your_DEVICE_NAME";
const char* deviceSecret = "your_DEVICE_SECRET";

// DHT11引脚
#define DHTPIN D1

// DHT11类型
#define DHTTYPE DHT11

// DHT11对象
DHT dht(DHTPIN, DHTTYPE);

// WiFi客户端对象和MQTT客户端对象
WiFiClient espClient;
PubSubClient client(espClient);

// MQTT订阅和发布的主题
const char* subTopic = "/sys/" + String(productKey) + "/" + String(deviceName) + "/thing/event/property/post";
const char* pubTopic = "/sys/" + String(productKey) + "/" + String(deviceName) + "/thing/event/property/post";

// 上一次更新时间
unsigned long lastUpdate = 0;

// 温湿度数据
float temperature = 0;
float humidity = 0;

void setup() {
  // 初始化串口和DHT11
  Serial.begin(9600);
  dht.begin();
  
  // 连接WiFi
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  
  Serial.println("WiFi connected!");
  
  // 连接MQTT服务器
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
  
  while (!client.connected()) {
    if (client.connect(deviceName, mqtt_user, mqtt_password)) {
      Serial.println("MQTT connected!");
      client.subscribe(subTopic);
    } else {
      Serial.println("MQTT connection failed!");
      delay(1000);
    }
  }
}

void loop() {
  // 每隔10秒读取一次温湿度数据，并上传至阿里云
  if (millis() - lastUpdate > 10000) {
    lastUpdate = millis();
    
    // 读取温湿度
    temperature = dht.readTemperature();
    humidity = dht.readHumidity();
    
    // 将温湿度数据转换为JSON格式
    String payload = "{\"id\":\"1\",\"params\":{\"Temperature\":{\"value\":\"" + String(temperature) + "\",\"unit\":\"C\"},\"Humidity\":{\"value\":\"" + String(humidity) + "\",\"unit\":\"%\"}},\"method\":\"thing.event.property.post\"}";
    
    // 发布温湿度数据
    client.publish(pubTopic, payload.c_str());
  }
  
  // 处理MQTT消息
  client.loop();
}

void callback(char* topic, byte* payload, unsigned int length) {
  // 处理MQTT消息
  // ...
}

注意：在使用此代码前，请确保已经创建了阿里云物联网平台产品、设备和Topic，并将设备的三元组（ProductKey、DeviceName和DeviceSecret）、WiFi参数、MQTT服务器参数和Topic参数正确填写到代码中。同时，为了保证代码正常运行，请确保已经安装了ESP8266WiFi、PubSubClient和DHT库。