#define inputPin A3
int val = 0;
const byte segmentCodes[] = {
  0b11000000, // 0
  0b11111001, // 1
  0b10100100, // 2
  0b10110000, // 3
  0b10011001, // 4
  0b10010010, // 5
  0b10000010, // 6
  0b11111000, // 7
  0b10000000, // 8
  0b10010000  // 9
};
unsigned long startTime = 0;
boolean isCounting = false;

void setup() {
  DDRB = 0b001111;
  DDRD = 0xFF;
  DDRC = 0;
  for (int i = 0; i < 4; i++) {
    PORTB |= (1 << i);
  }
}

void displayDigit(int digit) {
  PORTD = segmentCodes[digit];
}

void displayTime(unsigned long time) {
  int thousands = time / 10000;
  int hundreds = (time / 1000) % 10;
  int tens = (time / 100) % 10;
  int ones = time % 10;

  displayDigit(thousands);
  PORTB |= 0b000001;
  delay(5);
  PORTB ^= 0b000001;

  displayDigit(hundreds);
  PORTB |= 0b000010;
  delay(5);
  PORTB ^= 0b000010;

  displayDigit(tens);
  PORTB |= 0b000100;
  delay(5);
  PORTB ^= 0b000100;

  displayDigit(ones);
  PORTB |= 0b001000;
  delay(5);
  PORTB ^= 0b001000;
}

void FX() {
  if (startTime == 0) {
    startTime = millis(); // เริ่มต้นนับเวลา
  }
  unsigned long currentTime = millis();
  unsigned long elapsedTime = currentTime - startTime;
  displayTime(elapsedTime);
  if (elapsedTime > 99999) {
    while (true) {
      displayTime(99999);
    }
  }
}

void loop() {
  val = digitalRead(inputPin);
  if (val == 0 && !isCounting) {
    isCounting = true;
    FX();
  } else if (val == 0 && isCounting) {
    isCounting = false;
  }
}