# WS2812 / NeoPixel Example
# Raspberry Pi Pico + MicroPython
#
# Controls a strip of 12 LEDs connected to GP0.

from machine import Pin
import neopixel
import time

# -------------------------------
# Configuration
# -------------------------------

LED_PIN = 8          # GPIO connected to DIN
NUM_LEDS = 12        # Number of LEDs, 0-11 is used, not 1-12

# Create the NeoPixel object
np = neopixel.NeoPixel(Pin(LED_PIN), NUM_LEDS)

# -------------------------------
# Helper Functions
# -------------------------------

def clear():
    """Turn all LEDs off."""
    for i in range(NUM_LEDS):
        np[i] = (0, 0, 0)
    np.write()

def chase(color, delay=1):
    """Move one LED along the strip."""
    clear()

    for i in range(NUM_LEDS):
        clear()
        np[i] = color
        np.write()
        time.sleep(delay)

# -------------------------------
# Main Program
# -------------------------------

while True:

    # Chase effect
    chase((255, 0, 0), 0.08)
    chase((0, 255, 0), 0.08)
    chase((0, 0, 255), 0.08)