# SPDX-FileCopyrightText: 2025 Pagong
# SPDX-License-Identifier: MIT

import time
import board
import neopixel
import rainbowio

####################### 

# for Rpi-Pico with 16x16 NeoPixel-Matrix
NUM_COLS = 16
NUM_CELLS = 16
NUM_PIXELS = (NUM_COLS * NUM_CELLS)  # Update this to match the number of LEDs.

SPEED = 0.01       # Increase to slow down the effect. Decrease to speed it up.
BRIGHTNESS = 0.1   # A number between 0.0 and 1.0, where 0.0 is off, and 1.0 is max.

PIN = board.GP28   # This is the default pin on my RPi-Pico with 16x16 NeoPixel matrix
pixels = neopixel.NeoPixel(PIN, NUM_PIXELS, brightness=BRIGHTNESS, auto_write=False)

#####################

black = 0

while True:
    pixels.fill(black)
    pixels.show()
    time.sleep(50*SPEED)

    for i in range(NUM_PIXELS):
        for j in range(NUM_PIXELS):
            color = rainbowio.colorwheel(i+j)
            pixels[j] = color
        pixels.show()
        time.sleep(SPEED)