##############################################################
#             Neopixel WS2812 LED Interface                  #
##############################################################
#
# Neopixel WS2812 LED interface with Raspberry Pi Pico / W / 2 / w2 (Hardware & Simulation)
#
# Check out the link for Code explanation and Hardware details
# Link: 
#   http://tech.arunkumarn.in/blogs/raspberry-pi-pico/beginner-guide-to-programming-neopixel-rgb-leds-with-pico-and-micropython/
#
# 

from machine import Pin
import time
from neopixel import NeoPixel

pin = Pin(21, Pin.OUT)   # set GPIO 21 to output to drive NeoPixels
np = NeoPixel(pin, 16)   # create NeoPixel driver on GPIO 21 for 16 pixels

colors = [(255, 0 , 0), (0, 255, 0), (0, 0, 255), (255, 169, 0), (255, 255, 255)]

for color in colors:
    for i in range(16):
        np[i] = color 
        np.write()
        time.sleep_ms(100)

    time.sleep(1)


for color in colors:
    for i in range(15, -1, -1):
        np[i] = color 
        np.write()
        time.sleep_ms(100)

    time.sleep(1)