// Define segment values for digits 0-9 on a 7-segment display
const byte segValue[10][7] = {
  {0, 0, 0, 0, 0, 0, 1}, // 0
  {1, 0, 0, 1, 1, 1, 1}, // 1
  {0, 0, 1, 0, 0, 1, 0}, // 2
  {0, 0, 0, 0, 1, 1, 0}, // 3
  {1, 0, 0, 1, 1, 0, 0}, // 4
  {0, 1, 0, 0, 1, 0, 0}, // 5
  {0, 1, 0, 0, 0, 0, 0}, // 6
  {0, 0, 0, 1, 1, 1, 1}, // 7
  {0, 0, 0, 0, 0, 0, 0}, // 8
  {0, 0, 0, 0, 1, 0, 0}  // 9  
};

// Pin numbers for the segments and digits
const byte segmentPins[7] = {2, 3, 4, 5, 6, 7, 8}; 
const byte digitPins[3] = {10, 11, 12}; 

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

  // Clear all segments to be off initially
  clearSegments();

  // Initialize digit pins
  for (int i = 0; i < 3; i++) 
  {
    pinMode(digitPins[i], OUTPUT);
    digitalWrite(digitPins[i], LOW); // Start with all digits off
  }
}

void loop() {
  // Count from 1 to 3
  for (int count = 1; count <= 3; count++) 
  {
    displaySingleNumber(count); // Display the current number
    delay(300); // Delay for 1 second before moving to the next number
  }
}

// Function to display a single digit at a time
void displaySingleNumber(int number) 
{
  // Loop through each digit position
  for (int i = 0; i < 3; i++) {
    clearSegments(); // Clear all segments first

    digitalWrite(digitPins[i], HIGH); // Activate the current digit

    // Display the current number on the digit
    if (i == 0 && number == 1) { // Display '1' on left digit
      setSegment(number);
    }
    else if (i == 1 && number == 2) { // Display '2' on middle digit
      setSegment(number);
    }
    else if (i == 2 && number == 3) { // Display '3' on right digit
      setSegment(number);
    }
    delay(300); // Hold the digit on for 1 second
    digitalWrite(digitPins[i], LOW); // Turn off the digit
  }
}

// Function to set the segment values for the current number
void setSegment(int number) 
{
  for (int j = 0; j < 7; j++) {
    digitalWrite(segmentPins[j], segValue[number][j]); // Set segment values for the number
  }
}

// Function to clear all segments
void clearSegments()
 {
  for (int i = 0; i < 7; i++) {
    digitalWrite(segmentPins[i], HIGH); // Turn all segments off
  }
}