CircuitPython Trellis M4 color tilt demo

tiltcolor.py

# Trellis M4 Sketch
# tilt the board to change the color
# using https://github.com/adafruit/Adafruit_CircuitPython_TrellisM4
# and https://www.adafruit.com/product/4020

import time
import board
import busio
import adafruit_adxl34x
import adafruit_trellism4

trellis = adafruit_trellism4.TrellisM4Express()

color = (0, 0, 0)

# Our accelerometer
i2c = busio.I2C(board.ACCELEROMETER_SCL, board.ACCELEROMETER_SDA)
accelerometer = adafruit_adxl34x.ADXL345(i2c)

# return full saturation (R, G, B) color
def Wheel(pos):
    pos = 255 - pos
    if pos <= 85:
        return (255 - pos * 3, 0, pos * 3)
    elif pos > 85 and pos <= 170:
        pos -= 85
        return (0, pos * 3, 255 - pos * 3)
    elif pos > 170:
        pos -= 170
        return (pos * 3, 255 - pos * 3, 0)

def linmap(x, inx, iny, ox, oy):
    return ((x - inx) * (oy - ox) + ox * (iny - inx)) / (iny - inx)

last_print = 0
print_after  = 1

tilt = accelerometer.acceleration[1]
color = Wheel(0)

while True:
    tick = time.monotonic()
    tilt = accelerometer.acceleration[1]

    if tick > last_print + print_after:
        print("%0.3f %0.1f %s" % (tick, tilt, color))
        last_print = tick

    for x in range(trellis.pixels.width):
        for y in range(trellis.pixels.height):
            # convert acceleration left, right from [-12, 12] to [0, 255]
            color = Wheel(int(linmap(tilt, -12, 12, 0, 255)))
            trellis.pixels[x, y] = color