Circuit Playground Express Rainbow - Adafruit Feather M4 Express Manual

Table of Contents

The last example shows how to do a rainbow animation on the internal RGB LED.

Copy and paste the code into code.py using your favorite editor, and save the file. Remember to comment and

uncomment the right lines for the board you're using, as

import time

import board

# For Trinket M0, Gemma M0, ItsyBitsy M0 Express and ItsyBitsy M4 Express

import adafruit_dotstar

led = adafruit_dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1)

# For Feather M0 Express, Metro M0 Express, Metro M4 Express and Circuit Playground Express

# import neopixel

# led = neopixel.NeoPixel(board.NEOPIXEL, 1)

def wheel(pos):

# Input a value 0 to 255 to get a color value.

# The colours are a transition r - g - b - back to r.

if pos < 0 or pos > 255:

return 0, 0, 0

if pos < 85:

return int(255 - pos * 3), int(pos * 3), 0

if pos < 170:

pos -= 85

return 0, int(255 - pos * 3), int(pos * 3)

pos -= 170

return int(pos * 3), 0, int(255 - (pos * 3))

led.brightness = 0.3

i = 0

while True:

i = (i + 1) % 256

led.fill(wheel(i))

time.sleep(0.1)

We add the

function in after setup but before our main loop.

wheel

And right before our main loop, we assign the variable

The main loop contains some math that cycles

cycle

through the rainbow!

wheel()

The

determines the speed at which the rainbow changes. Try a higher number for a slower rainbow or a

time.sleep()

lower number for a faster one!