// Define the segment pins
const int segmentPins[] = {2, 3, 4, 5, 6, 7, 8};

// Digit patterns for 0-9 (common cathode)
const byte digitPatterns[] = {
    B00111111, // 0
  B00000110, // 1
B01011011, // 2
B01010111, // 3
  B01100110, // 4
B01110101, // 5
  B01111101, // 6
  B00000111, // 7
  B01111111, // 8
B01110111,// 9
};


void setup() {
  // Set segment pins as output
  for (int i = 0; i < 7; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }
}

void loop() {
  // Count up from 0 to 9
  for (int count = 0; count <= 9; count++) {
    displayDigit(count);
    delay(1000); // Wait for 1 second
  }

  // Count down from 9 to 0
  for (int count = 9; count >= 0; count--) {
    displayDigit(count);
    delay(1000); // Wait for 1 second
  }
}

void displayDigit(int digit) {
  // Set the segments for the current digit
  byte segments = digitPatterns[digit];
  for (int i = 0; i < 7; i++) {
    digitalWrite(segmentPins[i], bitRead(segments, i));
  }
}