// Define segment pins
const int A = 15;
const int B = 2;
const int C = 4;
const int D = 16;
const int E = 17;
const int F = 5;
const int G = 18;
const int DP = 19;

// Define common cathode pins for each display
const int displays[] = {21, 22, 23, 32, 33, 25, 26, 27, 14, 12};

// Digit segment patterns for common cathode (1 = ON, 0 = OFF)
// Each array represents the pattern for the digits 0-9
const bool digits[10][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
};

// Array of segment pins in order (A, B, C, D, E, F, G)
const int segmentPins[] = {A, B, C, D, E, F, G};

void setup() {
  // Set segment pins as outputs
  for (int i = 0; i < 7; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }
  pinMode(DP, OUTPUT);
  
  // Set display pins as outputs
  for (int i = 0; i < 10; i++) {
    pinMode(displays[i], OUTPUT);
    digitalWrite(displays[i], HIGH); // Turn off all displays initially
  }
}

void loop() {
  // Display numbers 1 to 9, then 0 on the 10 displays
  for (int i = 0; i < 10; i++) {
    displayDigit(i + 1);   // Display numbers 1 to 9, then wrap to 0
    digitalWrite(displays[i], LOW); // Turn on the current display
    delay(500);            // Hold the number for half a second
    digitalWrite(displays[i], HIGH); // Turn off the display
  }
}

// Function to display a single digit on the segments
void displayDigit(int number) {
  if (number == 10) number = 0; // Wrap to 0 after 9
  
  // Set each segment according to the digit pattern
  for (int i = 0; i < 7; i++) {
    digitalWrite(segmentPins[i], digits[number][i] ? HIGH : LOW);
  }
  
  // Optional: Set decimal point off
  digitalWrite(DP, LOW);
}