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esp8266 + MQTT + DHT11(温湿度计)

连线

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#include <Arduino.h>
#include <ESP8266wifi.h>
#include <PubSubclient.h>

#include "DHT.h"
#define DHTPIN 4     
#define DHTTYPE DHT11  

// wifi info
const char *SSID = "优美屋205";
const char *PASSWORD = "18111549";

// mqtt info
const char *MQTT_SERVER = "broker-cn.emqx.io";
const int MQTT_PROT = 1883;

// mqtt 主题
const char *MQTT_TOPIC_ONLINE = "xapi/home/online";
const char *MQTT_TOPIC_UPDATE = "xapi/home/update";
const char *CLIENT_ID = "esp8266-457065e5-f063-474e-2saf-caCF5cb52af5";

DHT dht(DHTPIN, DHTTYPE);
WiFiClient espClient;
PubSubClient client(espClient);

void inIT_wifi();
void mqtt_reconnect();
void mqtt_msg_callback(char *topic, byte *payload, unsigned int length);
void wb_update(); // 温湿度 发送

float h_DHT11 = 0; // 湿度
float t_DHT11 = 0; // 温度

void SETUP() {
    Serial.begin(115200);
    init_wifi();
    client.setServer(MQTT_SERVER, MQTT_PROT);
    client.setCallback(mqtt_msg_callback);
    dht.begin();
}

void loop() {
if(!client.connected()){
    mqtt_reconnect();
  }
  client.loop();
  wb_update();
}

void init_wifi(){
  Serial.println("连接中...");
  Serial.println(SSID);

  WiFi.begin(SSID, PASSWORD);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
}

void mqtt_reconnect(){
  while (!client.connected())
  {
    Serial.print("正在尝试MQTT连接");

    if(client.connect(CLIENT_ID)){
      Serial.println("已连接");
      client.publish(MQTT_TOPIC_ONLINE, "online"); // 发布
    }else{
      Serial.print("错误, rc");
      Serial.print(client.state());
      Serial.println("等待 5s");
      delay(5000);
    }
  }
}

void mqtt_msg_callback(char *topic, byte *payload, unsigned int length){
  Serial.print("Message arrived [");
  Serial.print(topic); // 打印主题信息
  Serial.print("] ");
}

void wb_update(){
  if(client.connected()){
    h_DHT11 = dht.readHumidity();
    t_DHT11 = dht.readTemperature();
    if (isnan(h_DHT11) || isnan(t_DHT11)) {
        h_DHT11 = 0;
        t_DHT11 = 0;
        Serial.println(F("Failed to read From DHT sensor!"));
        return;
    }

    String messageString ="{wendu:" + String(t_DHT11) + "," + "shidu:" + String(h_DHT11) + "}";
    char publishMsg[messageString.length() + 1];   
    strcpy(publishMsg, messageString.c_str());

    Serial.print(F("湿度: "));
    Serial.print(h_DHT11);

    Serial.print(F("%  温度: "));
    Serial.print(t_DHT11);
    Serial.print(F("°C "));
    Serial.printf("");
    delay(1000);
    client.publish(MQTT_TOPIC_UPDATE, publishMsg);
    delay(500);
  }
}

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