// This code gradually increases and decreases LED brightness using PWM
//FADE LED Brightness
#define PWM_PIN 3

void setup() {
  // Set pin 3 as an output for PWM LED control
  pinMode(PWM_PIN, OUTPUT);
}

void loop() {
  // Increase brightness from 0 to 255
  for (int i = 0; i <= 255; i++) {
    analogWrite(PWM_PIN, i);  // Set PWM duty cycle
    delay(10);          // Short delay to make fading visible
  }

  // Decrease brightness from 255 to 0
  for (int i = 255; i >= 0; i--) {
    analogWrite(PWM_PIN, i);  // Set PWM duty cycle
    delay(10);          // Short delay to make fading visible
  }
}