如何使用Azure Mobile Service結合Arduino及DHT11做出網路温度 / 溼度計 ?

在目前Raspberry Pi , Arduino及其它大廠 (聯發科LinkIt One / 瑞昱Ameba.....)推出相容開發板容易

取得及價格低廉的情況下 ,  要自行架個簡單的IOT環境 , 已不是難事 , 本次小編使用Azure

Mobile Service結合Arduino Uno3  + DHT11來製作一個簡單的網路温度/溼度計 , 做法如以下: 

1.首先到Azure Manage Portal建立Mobile Service
 

2.填入Server Name及DB管理者帳號及密碼
 


3.新增一個Table來存放資料


4.在Table Name輸入名字 , 並且設定任何人只要知道Application Key就可以新增/修改/刪除/讀取   資料

5.在Mobile Service中 , 確定Table已建立好 , 並且可正常運作

6. 在Azure Mobile Service點選管理金鑰 , 並記下二組金鑰 , 待會程式會用到



7.確認在Azure Mobile Service下的資料可以看到一個資料表名稱為tabledht11 , Mobile Service準備工作到此結束


8.先準備好Arduino Uno3  , Ethernet Shield , 3條杜邦線及DHT11 (温度/溼度感測器) ,如下圖 :

9.將Arudino Uno 3及Ethernet Shield組合起來 , Ethernet Shield在上面 , 如下圖 :

10~11.接下來必須將 DHT11的三支腳接到Ethernet Shield , 接線電路圖如下 :  DHT11的Vcc接Ethernet Shield 5V , DHT11的GND接Ethernet Shield的GND , DHT11的Data接Ethernet Shield D4

12.開啟Arduino IDE , 將以下程式碼貼上 , 只需填入Server Name , Table Name及步驟6的key即可

#include <SPI.h>

#include <Ethernet.h>

#include <dht11.h>

// Ethernet shield MAC address (sticker in the back)

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

/*You can find this values in your Mobile Service dashboard

   server = namemobileservice.azure-mobile.net

   table_name = nametable

   ams_key = your keyvalue, find in home page mobile service, with a click on button MANAGE KEYS*/

const char* server = "sensorfarm.azure-mobile.net";

const char* table_name = "tabsensor";

const char* ams_key = "you can find it on mobile service with manage keys button";

EthernetClient client;

char buffer[64];

dht11 DHT;

#define  DHT11_PIN 4

/*This method use Mobile service REST API fot to write value*/

void write_sensorvalue(double tempvalue, double humidityvalue)

{

   if (client.connect(server, 80)) {

      

     /*Table name in Mobile service*/

     sprintf(buffer, "POST /tables/%s HTTP/1.1", table_name);

     client.println(buffer);

    /*Sever name in Mobile Service*/

     sprintf(buffer, "Host: %s", server);

     client.println(buffer);

    /*Mobile Services application key*/

     sprintf(buffer, "X-ZUMO-APPLICATION: %s", ams_key);

     client.println(buffer);

    // JSON content type for the information

     client.println("Content-Type: application/json");

    /*Write values of temperature and humidity from DHT11 sensor*/

     sprintf(buffer, "{\"tempvalue\":\"%f\",\"humidityvalue\":\"%f\"}", tempvalue, humidityvalue);

    // Content length

     client.print("Content-Length: ");

     client.println(strlen(buffer));

    // End of headers

     client.println();

    // Request body

     client.println(buffer);

  }

    

   else

   {

     Serial.println("no connection available!");

   }

     client.stop();

}

/*-------------------------------------------------------*/

/*Setup method*/

/*-------------------------------------------------------*/

void setup()

{

   Serial.begin(9600);

  if (Ethernet.begin(mac) == 0)

   {

     Serial.println("ethernet shield failed");

     for (;;);

   }

    

   // Ethernet shield initialization:

   delay(1000);

}

/*-------------------------------------------------------*/

/*Loop method*/

/*-------------------------------------------------------*/

void loop()

{

   /*Read value from sensor input*/

   int chk = DHT.read(DHT11_PIN);

  /*Call method writ_sensorvalue and pass sensor parameter for to save on mobile service*/

   write_sensorvalue((DHT.temperature), (DHT.humidity));

  /*Time wait for new input data*/

   delay(10000);

}

13.在Arduino IDE執行程式結果如下 :

14. 即可從Azure Mobile Service中的Table中看到温度及溼度被寫入Table

15.使用SQL Server Management Studio開啟資料庫中的Table , 檢視温度及溼度值是否寫入

 16.若要移轉到Azure App Service ,  執行以下步驟


17.輸入要移轉的Mobile Service名稱


18.移轉到Azure App Service , 可看到Easy Tables , 温度及溼度值會寫到這裡

19.Easy Tables看到的温度及溼度值 , 如下圖 :

資料來源 : http://social.technet.microsoft.com/wiki/contents/articles/31660.arduino-due-and-mobile-service-it-it.aspx