int switchPin = 11;
int redPin = 5;
int var = 0; // Declare 'var' outside the loop to maintain its value

void setup() {
  pinMode(switchPin, INPUT_PULLUP); // Configure switch with pull-up resistor
  pinMode(redPin, OUTPUT);          // Set red LED pin as output
  Serial.begin(9600);
  delay(1000);                      // Allow time for initialization
}

void loop() {
  int temp = digitalRead(switchPin); // Read the switch state
  Serial.print("Output: ");
  Serial.println(temp);

  if (temp == LOW) { // If the button is pressed
    var = var + 10;  // Increment brightness
    if (var > 255) { // Ensure brightness stays within range
      var = 255;
    }
    analogWrite(redPin, var); // Set LED brightness
  } else if (temp == HIGH) { // If the button is released
    var = 0;                 // Reset brightness
    analogWrite(redPin, var); // Turn off LED
  }

  delay(250); // Delay for readability
}