//Date: 17.09.2025
//Name: Rajaram Parida
//Redg: 2241016203
//Section: 28
//Exp. No.: 5.2

const int ledPin = 10;
const int incButton = 9;
const int decButton = 8;
const int buzzerPin = 11;

int brightness = 0;
int step = 25;
int lastIncState = 0;
int lastDecState = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(incButton, INPUT);
  pinMode(decButton, INPUT);
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int incState = digitalRead(incButton);
  int decState = digitalRead(decButton);

  if (incState == HIGH && lastIncState == LOW) {
    brightness += step;
    if (brightness > 255) {
      brightness = 255;
      tone(buzzerPin, 1000, 200);
    }
    analogWrite(ledPin, brightness);
    Serial.print("Brightness: ");
    Serial.println(brightness);
    delay(200);
  }

  if (decState == HIGH && lastDecState == LOW) {
    brightness -= step;
    if (brightness < 0) {
      brightness = 0;
      tone(buzzerPin, 500, 200);
    }
    analogWrite(ledPin, brightness);
    Serial.print("Brightness: ");
    Serial.println(brightness);
    delay(200);
  }

  lastIncState = incState;
  lastDecState = decState;
}