如何用arduino+ethernet shield(W5100)与yeelink结合5分钟实现传感器数据web上传

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 <SPI.h>#include <Ethernet.h>#include <Wire.h>#include <math.h>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 APIunsigned long lastConnectionTime = 0;          // last time you connected to the server, in millisecondsboolean lastConnected = false;                 // state of the connection last time through the main loopconst unsigned long postingInterval = 30*1000; // delay between 2 datapoints, 30svoid 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 sensorint 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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