const int motorPin = 9; // Digital pin connected to the transistor base (via a resistor)

void setup() {
  pinMode(motorPin, OUTPUT); // Set the motorPin as output
}

void loop() {
  // Ramp up speed
  for (int speed = 0; speed <= 255; speed += 5) { // Gradually increase speed
    analogWrite(motorPin, speed);  // Set motor speed
    delay(50);                     // Small delay for smoother transition
  }

  // Ramp down speed
  for (int speed = 255; speed >= 0; speed -= 5) { // Gradually decrease speed
    analogWrite(motorPin, speed);  // Set motor speed
    delay(50);                     // Small delay for smoother transition
  }

  delay(1000); // Pause for 1 second before restarting the cycle
}