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:
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 :
