#define LED_PIN       9       
#define POT_PIN       A0      
#define STOP_BUTTON   2       
#define DEBOUNCE_DELAY 50

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(STOP_BUTTON, INPUT_PULLUP); 
  Serial.begin(9600);
}

void loop() {
  
  if (digitalRead(STOP_BUTTON) == LOW) {
    analogWrite(LED_PIN, 0);       
    Serial.println("LED oprit instant!");
    delay(DEBOUNCE_DELAY);         
    while (digitalRead(STOP_BUTTON) == LOW); 
    return; 
  }

  
  int potValue = analogRead(POT_PIN);          
  int pwmValue = map(potValue, 0, 1023, 0, 255); 

  analogWrite(LED_PIN, pwmValue);             

  Serial.print("Luminozitate PWM: ");
  Serial.print(pwmValue);
  Serial.print(" (");
  Serial.print((pwmValue * 100) / 255);
  Serial.println("%)");

  delay(100); 
}