SenhaKeypad

#include <Keypad.h>
char* senha = "159D";
int position = 0;
const byte LINHAS = 4;
const byte COLUNAS = 4;
char teclas[LINHAS][COLUNAS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte pinoLinha[LINHAS] = {9,8,7,6};
byte pinoColuna[COLUNAS] = {5,4,3,2};
Keypad keypad = Keypad(makeKeymap(teclas), pinoLinha, pinoColuna, LINHAS, COLUNAS);
int redPin = 10;
int greenPin = 11;
void setup(){
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  fechadoOk(true);
}
void loop(){
  char key = keypad.getKey();
  if (key == '*' || key == '#'){
    position = 0;
    fechadoOk(true);
  }
  if (key == senha[position]){
    position ++;
  }
  if (position == 4){
    fechadoOk(false);
  }
  delay(100);
}
void fechadoOk(int fechado){
  if (fechado){
    digitalWrite(redPin, HIGH);
    digitalWrite(greenPin, LOW);
  }
  else{
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, HIGH);
  }
}