#define DIR 10
#define PWM 11


// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(DIR, OUTPUT);
  pinMode(PWM, OUTPUT);
  stop();
}

// the loop function runs over and over again forever
void loop() {
  right(255);
  delay(5000);                       // wait for a second
  stop();
  delay(100);
  left(255);
  delay(5000);                       // wait for a second
  stop();
  delay(100);
}

void right(uint8_t value)
  {
    digitalWrite(DIR, HIGH);
    analogWrite(PWM, value);
  }

void left(uint8_t value)
  {
    digitalWrite(DIR, LOW);
    analogWrite(PWM, value);
  }

void stop()
  {
    digitalWrite(DIR, LOW);
    analogWrite(PWM, 0);
  }