ButtonMaze

const int correct[4] = {3,1,4,2};
#define LEN 4

void setup()
{
  pinMode(12, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  pinMode(8, INPUT_PULLUP);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(4, OUTPUT);
  Serial.begin(9600);
}

bool checkButton(int num){
  if(!digitalRead(num)){
    delay(30);
    if(!digitalRead(num))
      return true;
  }
  return false;
}

int getPress(){
  while(true){
    if(checkButton(12))
      return 1;
    if(checkButton(11))
      return 2;
    if(checkButton(10))
      return 3;
    if(checkButton(9))
      return 4;
    if(checkButton(8))
      return 5;
  }
}

void loop()
{
  for(int i = 4; i <= 7; i++)
    digitalWrite(i, LOW);
  digitalWrite(13, LOW);
  int i = 0;
  while(true){
    int c = getPress();
    if(c == 6)
      return;
    else{
        if(correct[i] != c)
          return;
      else{
        digitalWrite(7-i, HIGH);
        i++;
        delay(300);
      }
    }
    if(i == LEN-1){
      digitalWrite(13, HIGH);
      delay(1000);
      return;
    }
  }

}