//Arduino Bluetooth Controlled Car 
 //Before uploading the code you have to install the necessary library 
 //Note - Disconnect the Bluetooth Module before hiting the upload button otherwise you'll get compilation error message. 
 //AFMotor Library https://learn.adafruit.com/adafruit-motor-shield/library-install 
 //After downloading the library open Arduino IDE >> go to sketch >> Include Libray >> ADD. ZIP Libray >> Select the downloaded 
 //ZIP File >> Open it >> Done 
 //Now You Can Upload the Code without any problem but make sure the bt module isn't connected with Arduino while uploading code 
 #include <AFMotor.h> 
 //initial motors pin 
 AF_DCMotor 
 motor1 
 ( 
 1 
 , 
MOTOR12_1KHZ ) 
 ; 
 AF_DCMotor 
 motor2 
 ( 
 2 
 , 
MOTOR12_1KHZ ) 
 ; 
 AF_DCMotor 
 motor3 
 ( 
 3 
 , 
MOTOR34_1KHZ ) 
 ; 
 AF_DCMotor 
 motor4 
 ( 
 4 
 , 
MOTOR34_1KHZ ) 
 ; 
  char 
 
command ; 
  void 
 
 setup 
 ( 
 ) 
 { 
Serial . 
 begin 
 ( 
 9600 
 ) 
 ; 
 //Set the baud rate to your Bluetooth module. 
 } 
  void 
 
 loop 
 ( 
 ) 
 { 
 if 
 ( 
Serial . 
 available 
 ( 
 ) 
 > 
 0 
 ) 
 { 
command = 
Serial . 
 read 
 ( 
 ) 
 ; 
 Stop 
 ( 
 ) 
 ; 
 //initialize with motors stoped 
 //Change pin mode only if new command is different from previous. 
 //Serial.println(command); 
 switch 
 ( 
command ) 
 { 
 case 
 'F' 
 : 
 forward 
 ( 
 ) 
 ; 
 break 
 ; 
 case 
 'B' 
 : 
 back 
 ( 
 ) 
 ; 
 break 
 ; 
 case 
 'L' 
 : 
 left 
 ( 
 ) 
 ; 
 break 
 ; 
 case 
 'R' 
 : 
 right 
 ( 
 ) 
 ; 
 break 
 ; 
 } 
 } 
 } 
  void 
 
 forward 
 ( 
 ) 
 { 
motor1 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor1 . 
 run 
 ( 
FORWARD ) 
 ; 
 //rotate the motor clockwise 
motor2 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor2 . 
 run 
 ( 
FORWARD ) 
 ; 
 //rotate the motor clockwise 
motor3 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor3 . 
 run 
 ( 
FORWARD ) 
 ; 
 //rotate the motor clockwise 
motor4 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor4 . 
 run 
 ( 
FORWARD ) 
 ; 
 //rotate the motor clockwise 
 } 
  void 
 
 back 
 ( 
 ) 
 { 
motor1 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor1 . 
 run 
 ( 
BACKWARD ) 
 ; 
 //rotate the motor anti-clockwise 
motor2 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor2 . 
 run 
 ( 
BACKWARD ) 
 ; 
 //rotate the motor anti-clockwise 
motor3 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor3 . 
 run 
 ( 
BACKWARD ) 
 ; 
 //rotate the motor anti-clockwise 
motor4 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor4 . 
 run 
 ( 
BACKWARD ) 
 ; 
 //rotate the motor anti-clockwise 
 } 
  void 
 
 left 
 ( 
 ) 
 { 
motor1 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor1 . 
 run 
 ( 
BACKWARD ) 
 ; 
 //rotate the motor anti-clockwise 
motor2 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor2 . 
 run 
 ( 
BACKWARD ) 
 ; 
 //rotate the motor anti-clockwise 
motor3 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor3 . 
 run 
 ( 
FORWARD ) 
 ; 
 //rotate the motor clockwise 
motor4 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor4 . 
 run 
 ( 
FORWARD ) 
 ; 
 //rotate the motor clockwise 
 } 
  void 
 
 right 
 ( 
 ) 
 { 
motor1 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor1 . 
 run 
 ( 
FORWARD ) 
 ; 
 //rotate the motor clockwise 
motor2 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor2 . 
 run 
 ( 
FORWARD ) 
 ; 
 //rotate the motor clockwise 
motor3 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor3 . 
 run 
 ( 
BACKWARD ) 
 ; 
 //rotate the motor anti-clockwise 
motor4 . 
 setSpeed 
 ( 
 255 
 ) 
 ; 
 //Define maximum velocity 
motor4 . 
 run 
 ( 
BACKWARD ) 
 ; 
 //rotate the motor anti-clockwise 
 } 
  void 
 
 Stop 
 ( 
 ) 
 { 
motor1 . 
 setSpeed 
 ( 
 0 
 ) 
 ; 
 //Define minimum velocity 
motor1 . 
 run 
 ( 
RELEASE ) 
 ; 
 //stop the motor when release the button 
motor2 . 
 setSpeed 
 ( 
 0 
 ) 
 ; 
 //Define minimum velocity 
motor2 . 
 run 
 ( 
RELEASE ) 
 ; 
 //rotate the motor clockwise 
motor3 . 
 setSpeed 
 ( 
 0 
 ) 
 ; 
 //Define minimum velocity 
motor3 . 
 run 
 ( 
RELEASE ) 
 ; 
 //stop the motor when release the button 
motor4 . 
 setSpeed 
 ( 
 0 
 ) 
 ; 
 //Define minimum velocity 
motor4 . 
 run 
 ( 
RELEASE ) 
 ; 
 //stop the motor when release the button 
 }