int Green_LED = 5;
int Red_LED = 4;
int ButtonInput = 9;
int ButtonConfirm = 8;
int Digit = 0;
int InputBegins = 0;
uint32_t counter1 = 0;
uint32_t counter2 = 0;
int arrayDigits[4] = {0, 0, 0, 0};
int Pos = 0;
int arrayCorrectCode[4] = {2, 4, 3, 1};
// first I set up all the needed integers. Also I used something I know from C, which is Array.
// if I have an int , the array can store multiple ints which makes life easier when I have to do the code.




void setup() {
  pinMode(Green_LED, OUTPUT);
  pinMode(Red_LED, OUTPUT);
  pinMode(ButtonInput, INPUT_PULLUP);
  pinMode(ButtonConfirm, INPUT_PULLUP);
  Serial.begin(9600);
  // of course I always need to set up my leds and buttons and if something goes wrong I need the Serial Monitor.

}

void loop() {
  if (digitalRead(ButtonInput) == LOW && InputBegins == 0) {
    digitalWrite(Green_LED, HIGH);
    digitalWrite(Red_LED, HIGH);

    delay(1000);
    digitalWrite(Green_LED, LOW);
    digitalWrite(Red_LED, LOW);
    InputBegins = 1;
    // first as is shown in the instructions I have to make the LEDs light up and then peace out.
  }
  if (Pos < 4) {
    Serial.println(Pos);

    if (digitalRead(ButtonInput) == LOW) {
      if (counter1 == 0) {
        Digit = Digit + 1;
        digitalWrite(Green_LED, HIGH);
      }
      counter1 += 1;


    } else {
      digitalWrite(Green_LED, LOW);
      counter1 = 0;
    }
    if (digitalRead(ButtonConfirm) == LOW) {
      if (counter2 == 0) {
        digitalWrite(Red_LED, HIGH);

        arrayDigits[Pos] = Digit;
        Digit = 0;
        Pos += 1;


      }
      counter2 += 1;
    } else {
      digitalWrite(Red_LED, LOW);
      counter2 = 0;



    }
  } else {
    digitalWrite(Red_LED, LOW);
    if (arrayDigits[0] == arrayCorrectCode[0] && arrayDigits[1] == arrayCorrectCode[1] && arrayDigits[2] == arrayCorrectCode[2] && arrayDigits[3] == arrayCorrectCode[3]) {
      digitalWrite(Green_LED, HIGH);
      delay(2000);
      digitalWrite(Green_LED, LOW);
      InputBegins = 0;
      arrayDigits[0] = 0;
      arrayDigits[1] = 0;
      arrayDigits[2] = 0;
      arrayDigits[3] = 0;
      Pos = 0;
    }
    else {
      digitalWrite(Red_LED, HIGH);

      delay(2000);
      digitalWrite(Red_LED, LOW);
      InputBegins = 0;
      arrayDigits[0] = 0;
      arrayDigits[1] = 0;
      arrayDigits[2] = 0;
      arrayDigits[3] = 0;
      Pos = 0;
// here is where I have used the array so that I can set up my code and then I can compare if the code matches or not.
// if according to the array I have set up the code matches the LED at the end will be Green as in entry granted.
// if it is wrong the LED will be red.
    }
  }
  delay(50);
}