#include <Keypad.h>

const byte segmentPins[] = {A0, A1, A2, A3, A4, A5, A6};
const byte numSegments = 7;

const byte digitPins[] = {2, 3, 4, 5}; // Change these pins based on your wiring
const byte numDigits = 4;

// Define the common cathode seven-segment display patterns for digits 0-9
const byte digitPatterns[] = {
    0b11000000, // 0
    0b11111001, // 1
    0b10100100, // 2
    0b10110000, // 3
    0b10011001, // 4
    0b10010010, // 5
    0b10000010, // 6
    0b11111000, // 7
    0b10000000, // 8
    0b10010000  // 9
};

byte ROW_NUM = 4;
byte COLUMN_NUM = 4;
byte pin_rows[] = {1, 0, 2, 3};    // connect to the row pinouts of the keypad
byte pin_columns[] = {4, 5, 6, 7}; // connect to the column pinouts of the keypad

Keypad keypad = Keypad(makeKeymap("123A456B789C*0#"), pin_rows, pin_columns, ROW_NUM, COLUMN_NUM);

void setup() {
    // Set segment pins as OUTPUT
    for (byte i = 0; i < numSegments; i++) {
        pinMode(segmentPins[i], OUTPUT);
        digitalWrite(segmentPins[i], HIGH); // Common cathode, set HIGH initially
    }

    // Set digit pins as OUTPUT
    for (byte i = 0; i < numDigits; i++) {
        pinMode(digitPins[i], OUTPUT);
        digitalWrite(digitPins[i], LOW); // Set LOW initially
    }
}

void displayDigit(byte digit) {
    // Display a digit on the seven-segment display
    for (byte i = 0; i < numSegments; i++) {
        if (digitPatterns[digit] & (1 << i)) {
            digitalWrite(segmentPins[i], LOW); // Common cathode, set LOW to light up the segment
        } else {
            digitalWrite(segmentPins[i], HIGH);
        }
    }
}

void loop() {
    char key = keypad.getKey();
    
    if (key) {
        // Display the pressed key on the seven-segment display
        int digit = key - '0';
        
        if (digit >= 0 && digit <= 9) {
            for (byte i = 0; i < numDigits; i++) {
                // Activate the corresponding digit
                digitalWrite(digitPins[i], HIGH);
                
                // Display the pressed key
                displayDigit(digit);

                // Wait a short duration (adjust as needed)
                delay(5);

                // Turn off the digit
                digitalWrite(digitPins[i], LOW);
            }

            // Wait for a short duration before reading the next key
            // delay(500);
      
            }

        }
}