Arduino Lab 7 - 使用BT Control Relay On/Off 12v Fan

Lab目的︰

• 使用藍芽裝置控制Relay來開啟關閉12v的風扇。

元件︰

• BT Module x 1
• 1KΩ電阻  x 1
• 2N2222電晶體 x 1
• 1N4007 二極體 x 1
• 繼電器 DC-5v x 1
• DC 12v 風扇 x 1

接線圖︰

程式碼︰

#include <SoftwareSerial.h>
#define RxD 2
#define TxD 3
SoftwareSerial blueToothSerial(RxD,TxD); 


const int RELAY_ON = 0x1;
const int RELAY_OFF = 0x2;
const int relayPin = 12;                 // 繼電器(Relay)

const int DELAY = 300;

unsigned char temp_val;
unsigned char Receive_val;
unsigned char len;
unsigned char Buffer_temp[4];
unsigned char i;
char inputBuffer[10];

void setup()  
{
  pinMode(relayPin, OUTPUT);             // 把 relayPin 設置成 OUTPUT
  Serial.begin(9600);  
  blueToothSerial.begin(19200);
  temp_val=0;     
  len=0;
}

void loop()
{
  UART_FUN();

  if(temp_val==RELAY_ON)
  {
    digitalWrite(relayPin, HIGH); 
  }
  else if(temp_val==RELAY_OFF)
  {
    digitalWrite(relayPin, LOW); 
  }  

}



void UART_FUN()
{

  for(i=0;i<5;i++)
    Buffer_temp[i]=0x0;
  delay(100);
  while(blueToothSerial.available())            
  {                                                
    Receive_val=blueToothSerial.read();

    if(Receive_val==0xAA)
    {
      len=0;
      Buffer_temp[len++]=Receive_val;
    }
    else if(len < 5)
    {
      Buffer_temp[len++]=Receive_val;
    }

  }   

  if(Buffer_temp[0]==0xAA && Buffer_temp[1]==0xBB && Buffer_temp[3]==0xF1)
  {
    temp_val=RELAY_ON;
  }
  else if(Buffer_temp[0]==0xAA && Buffer_temp[1]==0xBB && Buffer_temp[3]==0xF2)
  {
    temp_val=RELAY_OFF ;
  }
}