#include <Adafruit_NeoPixel.h>

// #define ATTINY88
#ifdef ATTINY88
#define PIXPIN 0 // ATtiny88
#else 
#define PIXPIN 10 // Arduino
#endif

#define PIXNUM 22
#define ONE 0
#define TWO 21
Adafruit_NeoPixel pix (PIXNUM, PIXPIN, NEO_GRB + NEO_KHZ800);
int j = 1, maxi = 255, mini = 63;
int del = 20;

void setup() {
  pix.begin();
}

void loop() {
  for (int i = mini; i < maxi; i++) {
    pix.setPixelColor(ONE, pix.Color(i, 0, 0));
    pix.setPixelColor(TWO, pix.Color(i, 0, 0));
    pix.show();
    delay(del);
  }
  for (int i = maxi; i > mini; i--) {
    pix.setPixelColor(ONE, pix.Color(i, 0, 0));
    pix.setPixelColor(TWO, pix.Color(i, 0, 0));
    pix.show();
    delay(del);
  }
}