#include "LedControl.h"

LedControl lc = LedControl(11, 13, 10, 1);

// Button pins (avoid 0 and 1!)
const byte BTN_UP    = 2;
const byte BTN_DOWN  = 3;
const byte BTN_RIGHT = 4;
const byte BTN_LEFT  = 5;

// Arrow patterns
const byte arrowUp[8] = {
  B00011000,
  B00111100,
  B01100110,
  B11000011,
  B10011001,
  B00111100,
  B01100110,
  B11000011
};

const byte arrowDown[8] = {
  B11000011,
  B01100110,
  B00111100,
  B10011001,
  B11000011,
  B01100110,
  B00111100,
  B00011000
};

const byte arrowRight[8] = {
  B10011000,
  B11001100,
  B01100110,
  B00110011,
  B00110011,
  B01100110,
  B11001100,
  B10011000
};

const byte arrowLeft[8] = {
  B00011001,
  B00110011,
  B01100110,
  B11001100,
  B11001100,
  B01100110,
  B00110011,
  B00011001
};

void draw(const byte pattern[8]) {
  for (byte i = 0; i < 8; i++) {
    lc.setRow(0, i, pattern[i]);
  }
}

void setup() {
  lc.shutdown(0, false);
  lc.setIntensity(0, 8);
  lc.clearDisplay(0);

  pinMode(BTN_UP, INPUT);
  pinMode(BTN_DOWN, INPUT);
  pinMode(BTN_RIGHT, INPUT);
  pinMode(BTN_LEFT, INPUT);
}


void loop() {
  lc.clearDisplay(0);

  if (digitalRead(BTN_UP) == HIGH) {
    draw(arrowUp);
  }
  else if (digitalRead(BTN_DOWN) == HIGH) {
    draw(arrowDown);
  }
  else if (digitalRead(BTN_RIGHT) == HIGH) {
    draw(arrowRight);
  }
  else if (digitalRead(BTN_LEFT) == HIGH) {
    draw(arrowLeft);
  }
   delay(2);
}