If using a Trinket M0 board (not the earlier “AVR” type), you have the option of using CircuitPython instead of Arduino. Once installed, it’s usually easier to program this way.
If you haven't already, follow this guide to preparing the Trinket M0, including updating it with the latest version of CircuitPython.
With CircuitPython properly installed (the Trinket should show up as a small flash drive called “CIRCUITPY” when connected to USB), you can then load up the goggles code.
Click the “Download Project Bundle” below. This will download a ZIP file containing the project code and required libraries. Uncompress the ZIP file, look in the folder corresponding to the version of CircuitPython you installed, then drag the “code.py” file and the “lib” directory to the CIRCUITPY drive. It should then start running automatically.
#
# Kaleidoscope_Eyes_NeoPixel_LED_Goggles.py
#
import time
import board
import neopixel
try:
import urandom as random # for v1.0 API support
except ImportError:
import random
numpix = 32 # Number of NeoPixels
pixpin = board.D0 # Pin where NeoPixels are connected
mode = 0 # Current animation effect
offset = 0 # Position of spinny eyes
rgb_colors = ([255, 0, 0], # red
[0, 255, 0], # green
[0, 0, 255]) # blue
rgb_idx = 0 # index counter - primary color we are on
color = rgb_colors[rgb_idx]
prevtime = 0
pixels = neopixel.NeoPixel(pixpin, numpix, brightness=.3, auto_write=False)
prevtime = time.monotonic()
while True:
i = 0
t = 0
# Random sparks - just one LED on at a time!
if mode == 0:
i = random.randint(0, (numpix - 1))
pixels[i] = color
pixels.write()
time.sleep(0.01)
pixels[i] = (0, 0, 0)
# Spinny wheels (8 LEDs on at a time)
elif mode == 1:
for i in range(0, numpix):
c = 0
# 4 pixels on...
if ((offset + i) & 7) < 2:
c = color
pixels[i] = c # First eye
pixels[(numpix - 1) - i] = c # Second eye (flipped)
pixels.write()
offset += 1
time.sleep(0.05)
t = time.monotonic()
if (t - prevtime) > 8: # Every 8 seconds...
mode += 1 # Next mode
if mode > 1: # End of modes?
mode = 0 # Start modes over
if rgb_idx > 2: # reset R-->G-->B rotation
rgb_idx = 0
color = rgb_colors[rgb_idx] # next color assignment
rgb_idx += 1
for i in range(0, numpix):
pixels[i] = (0, 0, 0)
prevtime = t
