藍芽無線遙控車

#include <SoftwareSerial.h>

#include <Wire.h>

//輸出到L298N的腳位

#define MT_L 9  //ENA

#define IN1 8

#define IN2 7

#define IN3 5

#define IN4 4

#define MT_R 3  //ENB

char Car_status;

SoftwareSerial BT(10,11); //TXD接收腳, RXD傳送腳

void setup() {

  pinMode(MT_L,OUTPUT);

  pinMode(IN1,OUTPUT);

  pinMode(IN2,OUTPUT);

  pinMode(IN3,OUTPUT);

  pinMode(IN4,OUTPUT);

  pinMode(MT_R,OUTPUT);

  BT.begin(9600);

  Serial.begin(9600); 

}

void loop() {

//當藍芽有資料傳輸時，會將讀取到的字元存到Car_status。

  if (BT.available()){      

    Car_status =BT.read();    

  }     

//依照Car_status的字元來選擇車子方向控制

 switch(Car_status){   

  case 'F':

    Forward();

    Car_status='N';

    break;

  case 'B':

    Backward();

    Car_status='N';

    break;

  case 'R':

    TurnRight();

    Car_status='N';

    break;

  case 'L':

    TurnLeft(); 

    Car_status='N';

    break;

  case 'S':

    Stop();

    Car_status='N';

    break;

  }

}

//下面是停止、前進、後退、左轉、右轉的函式。

void Stop() 

{

  analogWrite(MT_L,0);

  analogWrite(MT_R,0);

}

void Forward()

{

   digitalWrite(IN1,HIGH);

   digitalWrite(IN2,LOW);

   digitalWrite(IN3,LOW);

   digitalWrite(IN4,HIGH);  

   analogWrite(MT_R,80);

   analogWrite(MT_L,110); 

}

void Backward()

{

   digitalWrite(IN1,LOW);

   digitalWrite(IN2,HIGH);

   digitalWrite(IN3,HIGH);

   digitalWrite(IN4,LOW);  

   analogWrite(MT_R,90);

   analogWrite(MT_L,100); 

}

void TurnRight()

{

   digitalWrite(IN1,HIGH);

   digitalWrite(IN2,LOW);

   digitalWrite(IN3,LOW);

   digitalWrite(IN4,HIGH);  

   analogWrite(MT_L,100);

   analogWrite(MT_R,0);   

}

void TurnLeft()

{

   digitalWrite(IN1,HIGH);

   digitalWrite(IN2,LOW);

   digitalWrite(IN3,LOW);

   digitalWrite(IN4,HIGH);  

   analogWrite(MT_L,0);

   analogWrite(MT_R,100);   

}