Arduino單元測試：Android與Arduino的藍芽通訊 並控制LED

測試透過藍芽通訊協定，傳達指令給 Arduino開關LED，但在這之前我們必須清楚了解我們手邊的藍芽型號是哪一種以及baud rate預設是多少。這的例藍芽型號採HC-06，baud rate改為57600 bps。

• 確認型號及腳位

       HC-06和Arduino的腳位對應:

•   跟改藍芽baud rate改，下列為更改為57600 bps，詳細可至下列參考資料查詢。

// A simple sketch to set baud rate of HC-0x bluetooth module 
// If successful configured, a response like "OK75600" will be shown on serial monitor 
// Command: AT+BAUDx, where x can be: 
//    1: 1200, 2:2400, 3:4800, 4:9600, 5:19200,  
//    6:38400, 7:57600, 8:115200, 9:230400 
void setup() 
 { 
  Serial.begin(9600);         // Baud rate of HC-0x bluetooth module 
   delay(6000);  
   Serial.write("AT+BAUD7");   // Set baud rate as 57600 
 } 
 void loop() 
 { 
   if (Serial.available()) 
    Serial.write(Serial.read()); 
 } 

• 上傳code至Arduino：上傳前記得要將藍芽電源拔除。

#include 
SoftwareSerial BTSerial(10, 11); // RX | TX
void setup()
{
  Serial.begin(57600);
  pinMode(13, OUTPUT); 
  pinMode(8, OUTPUT); 
  BTSerial.begin(57600);  // HC-06 current bound rate (default 57600)
}
void loop()
{
  // 讀出第 1 個字元 
     unsigned char charreceived = BTSerial.read(); 
     switch(charreceived){ 
      case '1':  //開啟LED
      digitalWrite(13, HIGH); 
      digitalWrite(8, HIGH);
      Serial.println("  Arduino Led On"); 
      break; 
      case '0': //關閉LED
         digitalWrite(13, LOW);
         digitalWrite(8, LOW); 
         Serial.println("  Arduino Led Off"); 
         break; 
      default: 
         break; 
     }
     Serial.flush(); 
     delay(10); 
}

• 將所有線路接至適當地腳位

腳位完成圖

•  下載安裝 Blueterm

•  完成影片

PS:把 LED 接到 pin8，長腳(陽極)接到 pin8，短腳(陰極)接到 GND 參考資料

1. http://www.funbroad.tw/p/maker-single-arduino-android-double_5129.html
2. http://coopermaa2nd.blogspot.tw/2012/07/config-bluetooth-baud-rate-w-arduino.html 
3. http://coopermaa2nd.blogspot.tw/2012/09/blueterm-and-arduino.html