ESP8266 DHT11 传感器数据上传 OneNET 平台并从 OneNET 获取数据

//引入ESP8266.h头文件，建议使用教程中修改后的文件 #include 'ESP8266.h' #include 'dht11.h' #include 'SoftwareSerial.h' #include<WiFi.h> #include<Servo.h> #include<ArduinoJson.h>//引入json解析库

//配置ESP8266WIFI设置 #define SSID 'HONOR Play4T' //填写2.4GHz的WIFI名称，不要使用校园网 #define PASSWORD '12345678'//填写自己的WIFI密码 #define HOST_NAME 'api.heclouds.com' //API主机名称，连接到OneNET平台，无需修改 #define DEVICE_ID '1099655073' //填写自己的OneNet设备ID #define HOST_PORT (80) //API端口，连接到OneNET平台，无需修改 String APIKey = 'IiJSs17atNND2C77wumz03w63hw='; //与设备绑定的APIKey String lightDatastreamId = 'light'; //光线数据流ID String tempDatastreamId = 'Temperature'; //温度数据流ID String humDatastreamId = 'Humidity'; //湿度数据流ID #define INTERVAL_SENSOR 5000 //定义传感器采样及发送时间间隔

//创建dht11示例

dht11 DHT11; //创建舵机 Servo myservo; int servoPin=7; int light=0; int servoPos=0; //定义DHT11接入Arduino的管脚 #define DHT11PIN 4

//定义ESP8266所连接的软串口 /*********************

• 该实验需要使用软串口
• Arduino上的软串口RX定义为D3,
• 接ESP8266上的TX口,
• Arduino上的软串口TX定义为D2,
• 接ESP8266上的RX口.
• D3和D2可以自定义,
• 但接ESP8266时必须恰好相反 *********************/ SoftwareSerial mySerial(3, 2); ESP8266 wifi(mySerial);

void handleCommand(String command) { Serial.print('Command received: '); Serial.println(command);

if (command == '0') { //控制舵机转到0度位置 myservo.write(0); servoPos = 0; light=0; Serial.println('Servo position: 0'); myservo.write(servoPos); } else if (command == '1') { //控制舵机转到180度位置 myservo.write(180); servoPos = 180; light=1; Serial.println('Servo position: 180'); myservo.write(servoPos); } else { Serial.println('Invalid command'); } }

void setup() { mySerial.begin(115200); //初始化软串口 Serial.begin(9600); //初始化串口 Serial.print('setup begin\r\n');

myservo.attach(servoPin); myservo.write(0);

//以下为ESP8266初始化的代码 Serial.print('FW Version: '); Serial.println(wifi.getVersion().c_str());

if (wifi.setOprToStation()) { Serial.print('to station ok\r\n'); } else { Serial.print('to station err\r\n'); }

//ESP8266接入WIFI if (wifi.joinAP(SSID, PASSWORD)) { Serial.print('Join AP success\r\n'); Serial.print('IP: '); Serial.println(wifi.getLocalIP().c_str()); } else { Serial.print('Join AP failure\r\n'); } Serial.println(''); Serial.print('DHT11 LIBRARY VERSION: '); Serial.println(DHT11LIB_VERSION);

mySerial.println('AT+UART_CUR=9600,8,1,0,0'); mySerial.begin(9600); Serial.println('setup end\r\n');

}

unsigned long net_time1 = millis(); //数据上传服务器时间

void loop(){

if (net_time1 > millis()) net_time1 = millis();

if (millis() - net_time1 > INTERVAL_SENSOR) //发送数据时间间隔 {

int chk = DHT11.read(DHT11PIN);

Serial.print('Read sensor: ');
switch (chk) {
  case DHTLIB_OK:
    Serial.println('OK');
    break;
  case DHTLIB_ERROR_CHECKSUM:
    Serial.println('Checksum error');
    break;
  case DHTLIB_ERROR_TIMEOUT:
    Serial.println('Time out error');
    break;
  default:
    Serial.println('Unknown error');
    break;
}

float sensor_hum = (float)DHT11.humidity; float sensor_tem = (float)DHT11.temperature; Serial.print('Humidity (%): '); Serial.println(sensor_hum, 2);

Serial.print('Temperature (oC): ');
Serial.println(sensor_tem, 2);
Serial.println('');

if (wifi.createTCP(HOST_NAME, HOST_PORT)) { //建立TCP连接，如果失败，不能发送该数据
  Serial.print('create tcp ok\r\n');
  char buf[10];

  //拼接发送data字段字符串
  String jsonToSend = '{"'+ tempDatastreamId +'":';
  dtostrf(sensor_tem, 1, 2, buf);
  jsonToSend += '"' + String(buf) + '"';
  jsonToSend += ','+ '"' + humDatastreamId + '":';
  dtostrf(sensor_hum, 1, 2, buf);
  jsonToSend += '"' + String(buf) + '"';
  jsonToSend += '}';

  //拼接POST请求字符串
  String postString = 'POST /devices/';
  postString += DEVICE_ID;
  postString += '/datapoints?type=3 HTTP/1.1';
  postString += '\r\n';
  postString += 'api-key:';
  postString += APIKey;
  postString += '\r\n';
  postString += 'Host:api.heclouds.com\r\n';
  postString += 'Connection:close\r\n';
  postString += 'Content-Length:';
  postString += jsonToSend.length();
  postString += '\r\n';
  postString += '\r\n';
  postString += jsonToSend;
  postString += '\r\n';
  postString += '\r\n';
  postString += '\r\n';

  const char *postArray = postString.c_str(); //将str转化为char数组

  Serial.println(postArray);
  wifi.send((const uint8_t *)postArray, strlen(postArray)); //send发送命令，参数必须是这两种格式，尤其是(const uint8_t*)
  Serial.println('send success');


  if (wifi.releaseTCP()) { //释放TCP连接
    Serial.print('release tcp ok\r\n');
  } else {
    Serial.print('release tcp err\r\n');
  }
postArray = NULL; 

}//清空数组，等待下次传输数据 else(Serial.print('create tcp err\r\n'));

//从OneNET获取数据
DynamicJsonDocument doc(1024);
if (wifi.createTCP(HOST_NAME, HOST_PORT)) {
  Serial.print('create tcp ok\r\n');
  String getReq = 'GET /devices/' + String(DEVICE_ID) + '/datastreams/' + lightDatastreamId + '?devIds=' + String(DEVICE_ID) + ' HTTP/1.1\r\n';
  getReq += 'api-key:' + APIKey + '\r\n';
  getReq += 'Host: ' + String(HOST_NAME) + '\r\n';
  getReq += 'Connection: close\r\n\r\n';
  const char *getReqArray = getReq.c_str();
  wifi.send((const uint8_t *)getReqArray, strlen(getReqArray));
  Serial.println('getReq:');
  Serial.println(getReq);

  int httpCode = wifi.recv(buf, sizeof(buf), 10000);
  String response = String(buf);
  Serial.println('response:');
  Serial.println(response);

  if (httpCode > 0) {
    DeserializationError error = deserializeJson(doc, response);
    if (error) {
      Serial.print('deserializeJson() failed: ');
      Serial.println(error.f_str());
    }
    else {
      light = doc['data']['current_value'];
      Serial.print('Current light value: ');
      Serial.println(light);
    }
  }
  else {
    Serial.println('Error on HTTP request');
  }

  if (wifi.releaseTCP()) {
    Serial.println('release tcp ok');
  }
}
else {
  Serial.println('create tcp err');
}
Serial.println('');
net_time1 = millis();

}