#include <FastLED.h>

#define DATA_PIN 3
#define LED_TYPE    WS2812
#define COLOR_ORDER GRB
#define SIDE 8
#define NUM_LEDS    64
#define BRIGHTNESS  255


CRGB leds[NUM_LEDS];

int matrix[SIDE][SIDE];

void setup(){
    Serial.begin(9600);
    FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
    FastLED.setBrightness(100);//max 255
    int index = 0;
    for(int i = 0 ; i < SIDE ; ++i){
        for(int j = 0 ; j < SIDE ; ++j){
            matrix[i][j] = index;
            index++;
        }
    }
}

void loop(){
    Serial.println("sftgh");
    leds[16] = CRGB::Red;
    FastLED.show();
    for(int i = 0 ; i < SIDE ; ++i){
        for(int j = 0 ; j < SIDE ; ++j){
            Serial.print("matrix[i][j]");
        }
        Serial.println("");
    }delay(10000);
}