ESP8266-01S + Arduino 接入阿里云物联网平台

esp8266-01s接入物联网

1.创建产品

 2.创建设备

 3.打开arduino 编写代码

#include <ESP8266WiFi.h>
/* 依赖 PubSubClient 2.4.0 */
#include <PubSubClient.h>
#include <ArduinoJson.h>

/* 连接您的WIFI SSID和密码 */
#define WIFI_SSID         "wifi名称"
#define WIFI_PASSWD       "wifi密码"

/* 线上环境域名和端口号 */
#define MQTT_SERVER       "地址"
#define MQTT_PORT         1883 //端口号
#define MQTT_USRNAME      "用户名"
#define CLIENT_ID         "client ID"
#define MQTT_PASSWD       "密码"

//发布消息用的topic
#define PubTopic "topic"


int ledPin = 2;
int GPIO = 0;

unsigned long lastMs = 0;
WiFiClient espClient;
PubSubClient  client(espClient);

//收到消息后的回调函数
void callback(char *topic, byte *payload, unsigned int length)
{
  
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  payload[length] = '\0';
  Serial.println((char *)payload);

  //解析json字符串
  DynamicJsonDocument doc(1024);

  deserializeJson(doc, payload);
  JsonObject obj = doc.as<JsonObject>();

  if (obj["a"] == "on") {
    setLed();
    Serial.println();
    Serial.print("on 关灯");
    digitalWrite(ledPin, HIGH); // 关
    digitalWrite(GPIO, LOW);//低电平默认继电器关闭
    Serial.println();
    pubMsg("关灯");
  }
  
  if (obj["a"] == "off") {
    setLed();
    Serial.println();
    Serial.print("off 开灯");
    digitalWrite(ledPin, LOW);//led 亮
    digitalWrite(GPIO, HIGH);//低电平默认继电器关闭
    Serial.println();
     pubMsg("开灯");

  }

   
}






//wifi初始化
void wifiInit()
{
  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_SSID, WIFI_PASSWD);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.println("WiFi not Connect");
  }

  Serial.println("Connected to AP");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  Serial.print("espClient [");
  client.setServer(MQTT_SERVER, MQTT_PORT);   /* 连接WiFi之后，连接MQTT服务器 */
  client.setCallback(callback);
}


//发布消息
/*********************************************************************/
//发布一个字符串的消息
void pubMsg(char *msg)
{
  boolean d = client.publish(PubTopic, msg);
  if (d) {
    Serial.println("publish success");
  } else {
    Serial.println("publish fail");
  }
}

//发布指定长度的字符消息
void pubMsgLen(uint8_t *msg, int len)
{
  boolean d = client.publish(PubTopic, msg, len);
  if (d) {
    Serial.println("publish success");
  } else {
    Serial.println("publish fail");
  }
}
/*********************************************************************/




 


//连接到服务器
void mqttCheckConnect()
{
  while (!client.connected()) {

    Serial.println("Connecting to MQTT Server ...");
    if (client.connect(CLIENT_ID, MQTT_USRNAME, MQTT_PASSWD)) {

      Serial.println("MQTT Connected!");
    } else {
      Serial.print("MQTT Connect err:");
      Serial.println(client.state());
      delay(5000);
    }
  }
}

void setup()
{
  /* initialize serial for debugging */
  Serial.begin(115200); //开启串口
  pinMode(ledPin, OUTPUT);
  pinMode(GPIO, OUTPUT);
  digitalWrite(ledPin, HIGH);//关灯
  digitalWrite(GPIO, LOW);//低电平默认继电器关闭
  Serial.println("Demo Start");
  wifiInit();//连接wifi
  unsigned char i = 0;
  mqttCheckConnect();//连接阿里云
  pubMsg("已连接阿里云物联网平台 ，hello aliyun!");


}

void setLed() {
  digitalWrite(ledPin, LOW);
  delay(500);
  digitalWrite(ledPin, HIGH);
  delay(500);
}

// the loop function runs over and over again forever
void loop()
{
  
  client.loop();//保持客户端的连接
}

4.烧录程序