const int BUTTON_PIN = PA0; 
const int SEGMENT_PINS[] = {PA7, PA6, PB4, PB5, PB6, PA8, PA9};
const byte DIGIT_MAP[][7] = {

  {1, 1, 1, 1, 1, 1, 0}, // 0
  {0, 1, 1, 0, 0, 0, 0}, // 1
  {1, 1, 0, 1, 1, 0, 1}, // 2
  {1, 1, 1, 1, 0, 0, 1}, // 3
  {0, 1, 1, 0, 0, 1, 1}, // 4
  {1, 0, 1, 1, 0, 1, 1}, // 5
  {1, 0, 1, 1, 1, 1, 1}, // 6
  {1, 1, 1, 0, 0, 0, 0}, // 7
  {1, 1, 1, 1, 1, 1, 1}, // 8
  {1, 1, 1, 1, 0, 1, 1}  // 9
};

int count = 0;
int buttonState;
int lastButtonState = HIGH; 
unsigned long lastDebounceTime = 0;
const unsigned long debounceDelay = 50; 


void displayDigit(int digit) {
  for (int i = 0; i < 7; i++) {
    digitalWrite(SEGMENT_PINS[i], DIGIT_MAP[digit][i]);
  }
}

void setup() {

  for (int i = 0; i < 7; i++) {
    pinMode(SEGMENT_PINS[i], OUTPUT);
    digitalWrite(SEGMENT_PINS[i], LOW); 
  }
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  displayDigit(count);
}

void loop() {
  int reading = digitalRead(BUTTON_PIN);
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      if (buttonState == LOW) {
        count = (count + 1) % 10;
        displayDigit(count);
      }
    }
  }
  lastButtonState = reading;
}