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

Adafruit_NeoPixel led(12, 9, NEO_GRB + NEO_KHZ800);

uint32_t red = led.Color(255, 0, 0);
uint32_t green = led.Color(0, 255, 0);
uint32_t blue = led.Color(0, 0, 255);
uint32_t white = led.Color(255, 255, 255);

uint32_t myarr[] = {green, red, blue, white};
int offset = 0;

void setup() {
  led.begin();
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2),myIntr,FALLING);
  if (EEPROM.read(1) != 255) {
    offset = EEPROM.read(1);
  }
}

void loop() {
  for(int i = 0; i < 12; i++) {
    led.setPixelColor(i, myarr[(i + offset) % 4]);
    led.show();
    delay(100);
  }
  EEPROM.update(1, offset);
  led.clear();
}

void myIntr() {
  offset++;
  if (offset > 3) {
    offset = 0;
  }
}