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const int MOTOR_MAX_VAL = 250;
const int MOTOR_RANGE_VAL = 30;
const int MOTOR_MIN_VAL = 90;
int speed = 0;
int motorPin = 9;

void setup(){
  pinMode(motorPin, OUTPUT);
}

void loop() {
  if (forward)  speed +=  MOTOR_RANGE_VAL;
  if (backward)  speed -=  MOTOR_RANGE_VAL;
  if (speed > MOTOR_MAX_VAL) speed = 250;
  if (speed < MOTOR_MIN_VAL) speed = 90;
  analogWrite(motorPin, speed);

}