const int ledPin = A1; // Pin connected to the LED
int brightness = 0; // Variable to store the brightness level
int fadeAmount = 3; // Rate of change in brightness

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an output
}

void loop() {
  analogWrite(ledPin, brightness); // Set the LED brightness using PWM

  brightness = brightness + fadeAmount; // Increment brightness
  
  // Reverse the direction of fading when reaching brightness limits
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  
  delay(30); // Adjust the fading speed by changing the delay
}