转自Yeelink博客。http://blog.yeelink.net/?p=34

本文介绍如何在Arduino上实现自己的Yeelink客户端，以便将采集到的传感器数据上传到Yeelink平台上。该例程会每隔30s采集一次传感器数据并发送到yeelink服务器。
硬件需求
Arduino主板
Ethernet板(W5100)
BH1750光强传感器模块(你可以替换成自己的传感器)
软件需求
Yeelink帐号（注册新用户）
增加一个设备和一个传感器(参考快速开始)
电路
Ethernet板和主板的插接略去。
传感器插接线：
VCC-5v
GND-GND
SCL-SCL(analog pin 5)
SDA-SDA(analog pin 4)
ADD-NC

实物图

Yeelink网站上生成的数据曲线

源码
同时也被开源至了Github
https://github.com/dapingliu/arduino_client_4_yeelink

/* Yeelink sensor client example */ #include  #include  #include  #include  int BH1750address = 0x23; byte buff[2]; // for yeelink api #define APIKEY "9cdf51696fa9ddfacdf819033a5f2f63" // replace your yeelink api key here #define DEVICEID 4 // replace your device ID #define SENSORID 7 // replace your sensor ID // assign a MAC address for the ethernet controller. byte mac[] = { 0x00, 0x1D, 0x72, 0x82, 0x35, 0x9D}; // initialize the library instance: EthernetClient client; char server[] = "api.yeelink.net"; // name address for yeelink API unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds boolean lastConnected = false; // state of the connection last time through the main loop const unsigned long postingInterval = 30*1000; // delay between 2 datapoints, 30s void setup() { Wire.begin(); // start serial port: Serial.begin(57600); // start the Ethernet connection with DHCP: if (Ethernet.begin(mac) == 0) { Serial.println("Failed to configure Ethernet using DHCP"); for(;;) ; } else { Serial.println("Ethernet configuration OK"); } } void loop() { // if there's incoming data from the net connection. // send it out the serial port. This is for debugging // purposes only: if (client.available()) { char c = client.read(); Serial.print(c); } // if there's no net connection, but there was one last time // through the loop, then stop the client: if (!client.connected() && lastConnected) { Serial.println(); Serial.println("disconnecting."); client.stop(); } // if you're not connected, and ten seconds have passed since // your last connection, then connect again and send data: if(!client.connected() && (millis() - lastConnectionTime > postingInterval)) { // read sensor data, replace with your code int sensorReading = readLightSensor(); //send data to server sendData(sensorReading); } // store the state of the connection for next time through // the loop: lastConnected = client.connected(); } // this method makes a HTTP connection to the server: void sendData(int thisData) { // if there's a successful connection: if (client.connect(server, 80)) { Serial.println("connecting..."); // send the HTTP PUT request: client.print("POST /v1.0/device/"); client.print(DEVICEID); client.print("/sensor/"); client.print(SENSORID); client.print("/datapoints"); client.println(" HTTP/1.1"); client.println("Host: api.yeelink.net"); client.print("Accept: *"); client.print("/"); client.println("*"); client.print("U-ApiKey: "); client.println(APIKEY); client.print("Content-Length: "); // calculate the length of the sensor reading in bytes: // 8 bytes for {"value":} + number of digits of the data: int thisLength = 10 + getLength(thisData); client.println(thisLength); client.println("Content-Type: application/x-www-form-urlencoded"); client.println("Connection: close"); client.println(); // here's the actual content of the PUT request: client.print("{\"value\":"); client.print(thisData); client.println("}"); } else { // if you couldn't make a connection: Serial.println("connection failed"); Serial.println(); Serial.println("disconnecting."); client.stop(); } // note the time that the connection was made or attempted: lastConnectionTime = millis(); } // This method calculates the number of digits in the // sensor reading. Since each digit of the ASCII decimal // representation is a byte, the number of digits equals // the number of bytes: int getLength(int someValue) { // there's at least one byte: int digits = 1; // continually divide the value by ten, // adding one to the digit count for each // time you divide, until you're at 0: int dividend = someValue /10; while (dividend > 0) { dividend = dividend /10; digits++; } // return the number of digits: return digits; } /////////////////////////////////////////////////////////////////////////// // get data from light sensor // you can replace this code for your sensor int readLightSensor() { uint16_t val=0; BH1750_Init(BH1750address); delay(200); if(2==BH1750_Read(BH1750address)) { val=((buff[0]<<8)|buff[1])/1.2; } Serial.print("Sensor value is: "); Serial.println((int)val); return val; } int BH1750_Read(int address) // { int i=0; Wire.beginTransmission(address); Wire.requestFrom(address, 2); while(Wire.available()) // { buff[i] = Wire.read(); // receive one byte i++; } Wire.endTransmission(); return i; } void BH1750_Init(int address) { Wire.beginTransmission(address); Wire.write(0x10);//1lx reolution 120ms Wire.endTransmission(); }

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