int ledBrightness = 3;
int buttonState = 0;
int lastButtonState = 0;
int pin = 9;

unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50; // 50 ms debounce time


void setup() {
  // put your setup code here, to run once:
  pinMode(pin, OUTPUT);
  pinMode(11, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int buttonState = digitalRead(11);

  if (lastButtonState == HIGH && buttonState == LOW) {
    ledBrightness--;
    if(ledBrightness < 0){
      ledBrightness = 3;
    }
  }

  


  if (ledBrightness == 3) {
      analogWrite(pin, 255); 
    } 
    else if (ledBrightness == 2) {
      analogWrite(pin, 175);
    } 
    else if (ledBrightness == 1) {
      analogWrite(pin, 85);
    } 
    else if (ledBrightness == 0) {
      analogWrite(pin, 0); 
    }
    
    delay(50); // Debounce delay

  lastButtonState = buttonState;

    

  }