int input_pin = 2;
volatile int valume;
int total = 0;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50; // หน่วยเป็น milliseconds


void setupTimer3(){
  noInterrupts();
    TCCR3A = 0;
    TCCR3B = 0;
    TCNT3 = 0;
  
  OCR3A = 15624*2;

  TCCR3B |= (1 << WGM32);
  TCCR3B |= (1 << CS32) | (1 << CS30);
  TIMSK3 |= (1 << OCIE3A);
  interrupts();
}


void setupTimer1(){
  noInterrupts();
    TCCR1A = 0;
    TCCR1B = 0;
    TCNT1 = 0;
  
  OCR1A = 15624;

  TCCR1B |= (1 << WGM12);
  TCCR1B |= (1 << CS12) | (1 << CS10);
  TIMSK1 |= (1 << OCIE1A);
  interrupts();
}

void setup(){
  pinMode(input_pin, INPUT);
  attachInterrupt(digitalPinToInterrupt(input_pin), state, CHANGE);
  DDRC = 0xFF;
  setupTimer3();
  Serial.begin(9600);
}

void loop(){

  PORTC = (1<<PC7);
  delay(500);
  PORTC = (0<<PC7);
  delay(500);
}

void state() {
  if ((millis() - lastDebounceTime) > debounceDelay) {
    valume = digitalRead(input_pin);
    Serial.print("Input reading: ");
    Serial.println(valume);
    lastDebounceTime = millis();
  }
}

ISR(TIMER3_COMPA_vect){
  PORTC ^= (1<<PC0) | (1<<PC1) | (1<<PC2) | (1<<PC3);
}