微信小程序+mqtt,esp8266温湿度读取的实现方法

#include <SimpleDHT.h>

// for DHT11, 
//  VCC: 5V or 3V
//  GND: GND
//  DATA: 2
int pinDHT11 = D4;
SimpleDHT11 dht11(pinDHT11);

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

void loop() {
 // start working...
 Serial.println("=================================");
 Serial.println("Sample DHT11...");
 
 // read without samples.
 byte temperature = 0;
 byte humidity = 0;
 int err = SimpleDHTErrSuccess;
 if ((err = dht11.read(&temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
 Serial.print("Read DHT11 failed, err="); Serial.println(err);delay(1000);
 return;
 }
 
 Serial.print("Sample OK: ");
 Serial.print((int)temperature); Serial.print(" *C, "); 
 Serial.print((int)humidity); Serial.println(" H");
 
 // DHT11 sampling rate is 1HZ.
 delay(1500);
}

const char* ssid = "newhtc";     //修改，修改为你的路由的WIFI名字
const char* password = "qq123456";   //修改为你的WIFI密码
const char* mqtt_server = "bemfa.com";  //默认，MQTT服务器地址
const int mqtt_server_port = 9501;   //默认，MQTT服务器端口
#define ID_MQTT "4d9ec352e0376f2110a0c601a2857225" //mqtt客户端ID，修改为你的开发者密钥
const char* topic = "led002";      //Led主题名字，可在巴法云控制台自行创建，名称随意
const char * dhttopic = "temp004";     //温湿度主题名字，可在巴法云mqtt控制台创建
int pinDHT11 = D4;       //dht11传感器引脚输入
int B_led = D5;       //控制的led引脚
long timeval = 3*1000;     //上传的传感器时间间隔，默认3秒

long now = millis();//获取当前时间戳
 if (now - lastMsg > timeval) {//如果达到3s，进行数据上传
 lastMsg = now;
 // read without samples.
 byte temperature = 0;
 byte humidity = 0;
 int err = SimpleDHTErrSuccess;
 if ((err = dht11.read(&temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
  Serial.print("Read DHT11 failed, err="); Serial.println(err); delay(1000);
  return;
 }
 String msg = "#"   (String)temperature   "#"   (String)humidity   "#"   ledstatus; //数据封装#温度#湿度#开关状态#
 client.publish(dhttopic, msg.c_str());//数据上传
 }

data: {
 uid:"4d9ec352e0376f2110a0c601a2857225",//用户密钥，巴法云控制台获取
 ledtopic:"led002",//控制led的主题，mqtt控制台创建
 dhttopic:"temp004",//传输温湿度的主题，控制台创建
 device_status:"离线",// 显示led是否在线的字符串，默认离线
 ledOnOff:"关闭",
 checked: false,//led的状态。默认led关闭
 wendu:"",//温度值，默认为空
 shidu:"",//湿度值，默认为空
 ledicon:"/utils/img/lightoff.png",//显示led图标的状态。默认是关闭状态图标
 client: null,//mqtt客户端，默认为空
 },