int column[16]={13,12,11,10,9,8,7,6,5,4,3,2,1,0,A5,A4}; //Column pins
int layer[4]={A3,A2,A1,A0}; //Layer pins

void setup() {
  for(int I = 0; I < 16; I++)
  {
    pinMode(column[I], OUTPUT);
  }

  for(int I = 0; I < 4; I++)
  {
    pinMode(layer[I], OUTPUT);
  }

  randomSeed(analogRead(10));
}

void turnOffEverything() {
  for(int I = 0; I < 16; I++) {
    digitalWrite(column[I],1);
  }
  for(int I = 0; I < 4; I++) {
    digitalWrite(layer[I], 0);
  }
}

void turnOnEverything() {
  for(int I = 0; I < 16; I++) {
    digitalWrite(column[I], 0);
  }
  for(int I = 0; I < 4; I++) {
    digitalWrite(layer[I], 1);
  }
}

void randomLed() {
  turnOffEverything();
  int x = 10;
  for(int I = 0; I != 750; I+=2) {
    int randomLayer = random(0,4);
    int randomColumn = random(0,16);

    digitalWrite(layer[randomLayer], 1);
    digitalWrite(column[randomColumn], 0);
    delay(x);
    digitalWrite(layer[randomLayer], 0);
    digitalWrite(column[randomColumn], 1);
    delay(x);
  }
}

void swipeOnOff() {
  turnOnEverything();
  int x = 50;
  for(int I = 0; I < 6; I++) {
    for(int I = 0; I < 16; I++) {
      digitalWrite(column[I], 1);
      delay(x);
    }

    for(int I = 0; I < 16; I++) {
      digitalWrite(column[I], 0);
      delay(x);
    }

    for(int I = 0; I < 16; I++) {
      digitalWrite(column[I], 1);
      delay(x);
    }

    for(int I = 0; I < 16; I++) {
      digitalWrite(column[I], 0);
      delay(x);
    }
  }
}

void stairs() {
  turnOffEverything();

  int x = 100;
  int dir = 0;

  while(x < 105) {
    digitalWrite(layer[0], 1);
    digitalWrite(column[0], 0);
    digitalWrite(column[4], 0);
    digitalWrite(column[8], 0);
    digitalWrite(column[12], 0);
    delay(x);
    digitalWrite(layer[1], 1);
    digitalWrite(column[1], 0);
    digitalWrite(column[5], 0);
    digitalWrite(column[9], 0);
    digitalWrite(column[13], 0);
    delay(x);
    digitalWrite(layer[2], 1);
    digitalWrite(column[2], 0);
    digitalWrite(column[6], 0);
    digitalWrite(column[10], 0);
    digitalWrite(column[14], 0);
    delay(x);
    digitalWrite(layer[3], 1);
    digitalWrite(column[3], 0);
    digitalWrite(column[7], 0);
    digitalWrite(column[11], 0);
    digitalWrite(column[15], 0);
    delay(x);

    digitalWrite(layer[0], 0);
    digitalWrite(column[0], 1);
    digitalWrite(column[4], 1);
    digitalWrite(column[8], 1);
    digitalWrite(column[12], 1);
    delay(x);
    digitalWrite(layer[1], 0);
    digitalWrite(column[1], 1);
    digitalWrite(column[5], 1);
    digitalWrite(column[9], 1);
    digitalWrite(column[13], 1);
    delay(x);
    digitalWrite(layer[2],0);
    digitalWrite(column[2], 1);
    digitalWrite(column[6], 1);
    digitalWrite(column[10], 1);
    digitalWrite(column[14], 1);
    delay(x);
    digitalWrite(layer[3], 0);
    digitalWrite(column[3], 1);
    digitalWrite(column[7], 1);
    digitalWrite(column[11], 1);
    digitalWrite(column[15], 1);
    delay(x);

    digitalWrite(layer[3], 1);
    digitalWrite(column[3], 0);
    digitalWrite(column[7], 0);
    digitalWrite(column[11], 0);
    digitalWrite(column[15], 0);
    delay(x);
    digitalWrite(layer[2], 1);
    digitalWrite(column[2], 0);
    digitalWrite(column[6], 0);
    digitalWrite(column[10], 0);
    digitalWrite(column[14], 0);
    delay(x);
    digitalWrite(layer[1], 1);
    digitalWrite(column[1], 0);
    digitalWrite(column[5], 0);
    digitalWrite(column[9], 0);
    digitalWrite(column[13], 0);
    delay(x);
    digitalWrite(layer[0], 1);
    digitalWrite(column[0], 0);
    digitalWrite(column[4], 0);
    digitalWrite(column[8], 0);
    digitalWrite(column[12], 0);
    delay(x);

    digitalWrite(layer[3], 0);
    digitalWrite(column[3], 1);
    digitalWrite(column[7], 1);
    digitalWrite(column[11], 1);
    digitalWrite(column[15], 1);
    delay(x);
    digitalWrite(layer[2],0);
    digitalWrite(column[2], 1);
    digitalWrite(column[6], 1);
    digitalWrite(column[10], 1);
    digitalWrite(column[14], 1);
    delay(x);
    digitalWrite(layer[1],0);
    digitalWrite(column[1], 1);
    digitalWrite(column[5], 1);
    digitalWrite(column[9], 1);
    digitalWrite(column[13], 1);
    delay(x);
    digitalWrite(layer[0], 0);
    digitalWrite(column[0], 1);
    digitalWrite(column[4], 1);
    digitalWrite(column[8], 1);
    digitalWrite(column[12], 1);
    delay(x);

    if(x < 5) {
      dir = 1;
    }
    if(dir == 0) {
      x-=5;
    } else {
      x+=5;
    }
  }
}

void loop() {
  //randomLed();
  //swipeOnOff();
  stairs();
}