#include <Keypad.h>
#include <FastLED.h>

#define ROWS 4
#define COLS 10
#define NUM_LEDS ROWS*COLS
#define DATA_PIN 12

CRGB leds[NUM_LEDS];
bool stan[NUM_LEDS] = { false };

byte hexaKeys[ROWS][COLS] = {
  {40, 36, 32, 28, 24, 20, 16, 12, 8, 4},
  {39, 35, 31, 27, 23, 19, 15, 11, 7, 3},
  {38, 34, 30, 26, 22, 18, 14, 10, 6, 2},
  {37, 33, 29, 25, 21, 17, 13, 9, 5, 1}
};

byte rowPins[ROWS] = {A0, A1, A2, A3};
byte colPins[COLS] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};

Keypad klawiatura = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

void setup(){
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
  Serial.begin(9600);
}

void loop(){
  signed char id = klawiatura.getKey() - 1;

  if (id >= 0){
    stan[id] = !stan[id];
    leds[id] = (stan[id] == true ? CRGB::White : CRGB::Black);
    FastLED.show();

    char buff[20] = {0};
    snprintf(buff, 20, "id: %i [%s]", id + 1, stan[id] == true ? "on" : "off");
    Serial.println(buff);

    delay(50);
  }
}