#define SW1 3
#define SW2 2

#define Motor_F 5
#define Motor_R 6

int PWM = 0;
int Speed = 0;
int ModeF = 0;
int ModeR = 0;

void setup() {

  pinMode(SW1, INPUT_PULLUP);
  pinMode(SW2, INPUT_PULLUP);

  pinMode(Motor_F, OUTPUT);
  pinMode(Motor_R, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  PWM = analogRead(A0);
  Speed = map(PWM,0,1023,0,255);

  if(digitalRead(SW1)==0) {   ModeF++; ModeR=0; while(digitalRead(SW1)==0) { delay(10); }  
                              analogWrite(Motor_F, 0);
                              analogWrite(Motor_R, 0);
                              delay(500);
                          }
                          
  if(digitalRead(SW2)==0) {   ModeR++; ModeF=0; while(digitalRead(SW2)==0) { delay(10); }  
                              analogWrite(Motor_F, 0);
                              analogWrite(Motor_R, 0);
                              delay(500);
                          }

  if(ModeF%2==1)
  {
      Serial.println("MotorF ON || MotorR OFF");
      analogWrite(Motor_F, Speed);
      analogWrite(Motor_R, 0);
  }
  else if(ModeR%2==1)
  {
      Serial.println("MotorF OFF || MotorR ON");
      analogWrite(Motor_F, 0);
      analogWrite(Motor_R, Speed);
  }
  else
  {
     Serial.println("MotorF OFF || MotorR OFF");
     analogWrite(Motor_F, 0);
     analogWrite(Motor_R, 0);
  }

  delay(30);
}