#include <TM1637Display.h>
#include <Keypad.h>

#define CLK 10
#define DIO 11
#define ROWS 4
#define COLS 4

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

byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
TM1637Display display(CLK, DIO);

uint16_t number = 0;

void setup() {
    display.setBrightness(7);
}

void loop() {
    char key = keypad.getKey();

    if (key) {
        if (key >= '0' && key <= '9') {  
            number = (number * 10 + (key - '0')) % 10000;
        }
        else if (key == '*') {  
            number = 0;
        }
        else if (key == '#') {  
            number /= 10;
        }

        display.showNumberDec(number, false);
    }
}