#include <Adafruit_NeoPixel.h>
#include <EEPROM.h>

Adafruit_NeoPixel stromcek(16, 8, NEO_GRB + NEO_KHZ800);
byte farba = 0;
long color;
bool test = true;

void setup() {
  Serial.begin(9600);
  stromcek.begin();
  EEPROM.begin();
  pinMode(2, INPUT_PULLUP);
  farba = EEPROM.read(100);
  vysviet();
}

void loop() {
  if(digitalRead(2) == LOW && test == true) {
    test = false;
    if(farba < 2)
      farba++;
    else
      farba = 0;
    vysviet();
    EEPROM.write(100, farba);
  }
  else if(digitalRead(2) == HIGH && test == false) {
    test = true;
  }
}

void vysviet() {
  if (farba == 0)
    color = stromcek.Color(255, 0, 0);
  else if (farba == 1)
    color = stromcek.Color(0, 255, 0);
  else
    color = stromcek.Color(0, 0, 255);

  for(byte i = 0; i < 16; i++)
    stromcek.setPixelColor(i, color);
  stromcek.show();
}