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

下面是一个简单的示例代码，用于ESP32通过串口读取DHT11传感器的温湿度数据，并将其传输到ESP8266连接的MQTT服务器上：

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

#define DHTPIN 4
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

#define RX 16
#define TX 17

SoftwareSerial Serial1(RX, TX); // RX, TX

const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* mqttServer = "your_MQTT_server_address";
const int mqttPort = 1883;
const char* mqttUser = "your_MQTT_username";
const char* mqttPassword = "your_MQTT_password";

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(9600);
  Serial1.begin(9600);
  dht.begin();

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  Serial.println("Connected to WiFi");

  client.setServer(mqttServer, mqttPort);
  client.setCallback(callback);

  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");

    if (client.connect("ESP32Client", mqttUser, mqttPassword)) {
      Serial.println("connected");
    } else {
      Serial.print("failed with state ");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C");

  String payload = String(temperature) + "," + String(humidity);
  client.publish("your_topic", payload.c_str());
  delay(5000);
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived in topic: ");
  Serial.println(topic);

  Serial.print("Message:");

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
  }

  Serial.println();
}

注意，上述代码需要使用以下库：

- Adafruit_Sensor
- DHT
- SoftwareSerial
- PubSubClient
- WiFi

在代码中，我们首先定义了DHT11传感器的引脚和类型。接下来，我们定义了ESP8266连接的MQTT服务器的信息，以及WiFi网络的SSID和密码。然后，我们初始化WiFi连接和MQTT客户端，并在主循环中读取DHT11传感器的温湿度数据，并将其转换为字符串形式，然后通过MQTT发布到指定的主题中。最后，我们还定义了一个回调函数，用于处理从MQTT服务器接收到的消息。