#include <Keypad.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 4;

char key_pass[9] = { NULL };
char patrick[] = {'1', '0', '3', '0', '7', '3', '4', '5', '8'}; // 103073458
char evan[]    = {'1', '0', '3', '6', '1', '4', '7', '5', '0'}; // 103614750
char michael[] = {'1', '0', '3', '5', '9', '7', '8', '0', '6'}; // 103597806
int counter = 0;

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

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
  Serial.begin(9600);
}

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

  if (key != NO_KEY) {
    key_pass[counter] = key;
    counter += 1;
    if (key == '#') {
      counter = 0;
    }
    if (counter == 9) {
      Serial.println("test");
    }
    Serial.println(key);
    Serial.println(key_pass);
  }
}