const int ledPin = 2; // GPIO pin connected to the LED

void setup() {
  Serial.begin(9600);   // Initialize serial communication
  pinMode(ledPin, OUTPUT); // Set LED pin as output
}

void loop() {
  if (Serial.available() > 0) { // Check if serial data is available
    int intensity = Serial.parseInt(); // Read the integer value from serial
    intensity = constrain(intensity, 0, 255); // Constrain the value between 0 and 255
    analogWrite(ledPin, intensity); // Set LED brightness using PWM
  }
}