#include <Keypad.h>

/* Display */
/* Keypad setup */
byte rowPins[4] = {5, 4, 3, 2};
byte colPins[4] = {A3, A2, A1, A0};

char keys[4][4] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, 4, 4);

const int segmentPins[] = {10, 9, 6, 7, 8, 11, 12};  // Replace with your segment pins

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

void displayDigit(int digit) {
  const int digitValues[] = {
    0b0111111,  // 0
    0b0000110,  // 1
    0b1011011,  // 2
    0b1001111,  // 3
    0b1100110,  // 4
    0b1101101,  // 5
    0b1111101,  // 6
    0b0000111,  // 7
    0b1111111,  // 8
    0b1101111   // 9
  };

  // Set the segments to display the digit
  for (int i = 0; i < 7; i++) {
    digitalWrite(segmentPins[i], (digitValues[digit] >> i) & 1);
  }
}

int hexCharToDecimal(char hexChar) {
    // Check if the input is a valid hexadecimal character
    if (!isxdigit(hexChar)) {
        Serial.println("Not a valid key");
        return -1;  // Return an error code
    }


    // Convert the hexadecimal character to decimal
    if (isdigit(hexChar)) {
        return hexChar - '0';
    } else {
        return toupper(hexChar) - 'A' + 10;
    }
}

void loop() {
  char key = keypad.getKey();
  if (key) {
    displayDigit(hexCharToDecimal(key));
    Serial.println(key);
  }
}