# NeoPixels Rainbow on MicroPython
# Wokwi Example https://wokwi.com/arduino/projects/305569065545499202

from machine import Pin
from neopixel import NeoPixel
from time import sleep

pos = 0
maxpix = 100
pixels = NeoPixel(Pin(15), maxpix)

def handle_interrupt(pin):
  global pos
  pos  = pos + 1
  if pos > maxpix:
    pos = 0
  pixels.fill((0,0,0))
  pixels[pos] = (0,255,0)
  pixels.write()

p1 = Pin(21, Pin.IN)
p1.irq(trigger=Pin.IRQ_RISING, handler=handle_interrupt)