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 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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