//.....................Arduino Keypad 4x4..............
//.................Download Keypad.h library...........

#include <Keypad.h>
#include <Wire.h> 

const byte ROWS = 4; 
const byte COLS = 4; 

char hexaKeys[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 customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);


char resset;
char customKey;
char entre[5];
int count =0;
char mdp[] = "123BC";

void setup(){
  pinMode(12, OUTPUT);
  Serial.begin(9600);
}
  
void loop(){
  customKey = customKeypad.getKey();
  if (customKey){
    //Serial.println(customKey);
    entre[count] = customKey;
    count++;
    Serial.println(entre);
    
    resset = customKey;
    if (resset == '#'){
      count = 0;
    }
    
    if (count >= 5) {
      count = 0;
    }
    // la fonction strcmp compare deux chaines de caractères, on vérifie s'ils correspondent
  if (!strcmp(entre, mdp)){
    // on allume la sortie 12 si le code est bon
    digitalWrite(12, HIGH);
  }
    else if (strcmp(entre, mdp)){
    // on allume la sortie 12 si le code est bon
    digitalWrite(12, LOW);
  }
   
  }
}