// Define the segment pins (assuming 7-segment pins a-g)
int segmentPins[] = {2, 3, 4, 5, 6, 7, 8, 9};  // Pin numbers for segments a-g

// Define the digit pins (assuming 4 common pins for 4 digits)
int digitPins[] = {10, 11, 12, 13};  // Pins for digit selection

int potentiometerPin = A0;  // Potentiometer analog pin

// Digit patterns for numbers 0-9 (bit patterns for segments a-g)
byte digitPatterns[] = {
  0b11111100,  // 0
  0b01100000,  // 1
  0b11011010,  // 2
  0b11110010,  // 3
  0b01100110,  // 4
  0b01101101,  // 5
  0b01111101,  // 6
  0b00000111,  // 7
  0b01111111,  // 8
  0b01101111,   // 9
};

void setup() {
  // Set up segment pins as output
  for (int i = 0; i < 8; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }

  // Set up digit pins as output
  for (int i = 0; i < 4; i++) {
    pinMode(digitPins[i], OUTPUT);
  }

  // Start by turning off all digits
  for (int i = 0; i < 4; i++) {
    digitalWrite(digitPins[i], LOW);
  }
}

void loop() {
  // Read the potentiometer value (0 to 1023)
  int sensorValue = analogRead(potentiometerPin);
  
  // Map the sensor value to a range of 0-9999
  int displayValue = map(sensorValue, 0, 1023, 0, 9999);

  // Break down the number into individual digits
  int digits[4];
  for (int i = 0; i < 4; i++) {
    digits[i] = displayValue % 10;
    displayValue /= 10;
  }

  // Multiplexing through the digits
  for (int digit = 0; digit < 4; digit++) {
    displayDigit(digit, digits[digit]);
    delay(5);  // Small delay for multiplexing
  }
}

// Function to display a single digit on the 7-segment display
void displayDigit(int digit, int value) {
  // Turn off all digits
  for (int i = 0; i < 4; i++) {
    digitalWrite(digitPins[i], HIGH);  // HIGH to turn off
  }

  // Display the correct segments for this digit
  byte pattern = digitPatterns[value];
  for (int i = 0; i < 8; i++) {
    digitalWrite(segmentPins[i], bitRead(pattern, i));  // Send bit for each segment
  }

  // Turn on the current digit
  digitalWrite(digitPins[digit], LOW);  // LOW to turn on
}