#include <AFMotor.h>

AF_DCMotor motor1(1, MOTOR12_1KHZ); 
AF_DCMotor motor2(2, MOTOR12_1KHZ);
AF_DCMotor motor3(3, MOTOR34_1KHZ);
AF_DCMotor motor4(4, MOTOR34_1KHZ);

void setup() 
   {  pinMode(A0,INPUT);
      pinMode(A1,INPUT);  
      delay(3000);       }

void loop()
{
   if(digitalRead(A0)==0 && digitalRead(A1)==0)
   {  motor1.run(FORWARD);
      motor1.setSpeed(150);
      motor2.run(FORWARD);
      motor2.setSpeed(150);
      motor3.run(FORWARD);
      motor3.setSpeed(150);
      motor4.run(FORWARD);
      motor4.setSpeed(150);  }
      
  else if(digitalRead(A0)==0 && !digitalRead(A1)==0)
   {  motor1.run(FORWARD);
      motor1.setSpeed(190);
      motor2.run(FORWARD);
      motor2.setSpeed(190);
      motor3.run(BACKWARD);
      motor3.setSpeed(190);
      motor4.run(BACKWARD);
      motor4.setSpeed(190);  }
      
  else if(!digitalRead(A0)==0 && digitalRead(A1)==0)
    { motor1.run(BACKWARD);
      motor1.setSpeed(190);
      motor2.run(BACKWARD);
      motor2.setSpeed(190);
      motor3.run(FORWARD);
      motor3.setSpeed(190);
      motor4.run(FORWARD);
      motor4.setSpeed(190);  }
      
  else if(!digitalRead(A0)==0 && !digitalRead(A1)==0)
    { motor1.run(RELEASE);
      motor1.setSpeed(0);
      motor2.run(RELEASE);
      motor2.setSpeed(0);
      motor3.run(RELEASE);
      motor3.setSpeed(0);
      motor4.run(RELEASE);
      motor4.setSpeed(0);  }
}