const int ledPin = 9;         // PWM-capable digital pin connected to the MOSFET gate
const int buttonPin = 2;      // Digital pin connected to the button
int brightnessLevels[] = {0, 64, 128, 255}; // PWM values for off, 25%, 50%, and 100% brightness
int currentLevel = 0;         // Current brightness level index
bool buttonState = HIGH;      // Current state of the button
bool lastButtonState = HIGH;  // Previous state of the button
unsigned long lastDebounceTime = 0; // The last time the button was toggled
unsigned long debounceDelay = 50;   // The debounce time; increase if the output flickers
void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);  // Use internal pull-up resistor
  Serial.begin(9600);
  while (true)
{
  int reading = digitalRead(buttonPin);
  // Check if the button state has changed
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }
  // Check if enough time has passed to consider the button state stable
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      // Only toggle the brightness if the new button state is LOW (button pressed)
      if (buttonState == LOW) {
        currentLevel = (currentLevel + 1) % 4; // Cycle through brightness levels including off
        analogWrite(ledPin, brightnessLevels[currentLevel]); // Set LED brightness
        Serial.print("Brightness Level: ");
        Serial.println(currentLevel);
      }
    }
  }
  lastButtonState = reading;
 }
}

void loop() {}