CircuitPython Code

GEMMA M0 boards can run CircuitPython — a different approach to programming compared to Arduino sketches. In fact, CircuitPython comes factory pre-loaded on GEMMA M0. If you’ve overwritten it with an Arduino sketch, or just want to learn the basics of setting up and using CircuitPython, this is explained in the Adafruit GEMMA M0 guide.

These directions are specific to the “M0” GEMMA board. The original GEMMA with an 8-bit AVR microcontroller doesn’t run CircuitPython…for those boards, use the Arduino sketch on the prior page of this guide.

Below is CircuitPython code that works similarly to the Arduino sketch shown on theprior page. To use this, plug the GEMMA M0 into USB…it should show up on your computer as a small flash drive…then edit the file “” with your text editor of choice. Select and copy the code below and paste it into that file, entirely replacing its contents (don’t mix it in with lingering bits of old code). When you save the file, the code should start running almost immediately (if not, see notes at the bottom of this page).

If GEMMA M0 doesn’t show up as a drive, follow the GEMMA M0 guide link above to prepare the board for CircuitPython.

import board
import neopixel
import time
	import urandom as random  # for v1.0 API support
except ImportError:
	import random

numpix = 36        # Number of NeoPixels
pixpin = board.D1  # Pin where NeoPixels are connected
strip  = neopixel.NeoPixel(pixpin, numpix, brightness=1.0)

mode     = 0  # Current animation effect
offset   = 0  # Position of spinner animation
color    = [160, 0, 160]     # RGB color - purple
prevtime = time.monotonic()  # Time of last animation mode switch

while True:  # Loop forever...

	if mode == 0:  # Random sparkles - lights just one LED at a time
		i = random.randint(0, numpix - 1)  # Choose random pixel
		strip[i] = color   # Set it to current color
		strip.write()      # Refresh LED states
		# Set same pixel to "off" color now but DON'T refresh...
		# it stays on for this and the next random
		# pixel will be refreshed on the next pass.
		strip[i] = [0,0,0]
		time.sleep(0.008)  # 8 millisecond delay
	elif mode == 1:  # Spinny wheel (4 LEDs on at a time)
		for i in range(numpix):  # For each LED...
			if ((offset + i) & 7) < 2:  # 2 pixels out of 8...
				strip[i] = color    # are set to current color
				strip[i] = [0,0,0]  # other pixels are off
		strip.write()    # Refresh LED states
		time.sleep(0.08) # 80 millisecond delay
		offset += 1      # Shift animation by 1 pixel on next frame
		if offset >= 8: offset = 0
	# Additional animation modes could be added here!

	t = time.monotonic()         # Current time in seconds
	if (t - prevtime) >= 8:      # Every 8 seconds...
		mode    += 1         # Advance to next mode
		if mode > 1:         # End of modes? 
			mode  =  0   # Start over from beginning
		strip.fill([0,0,0])  # Turn off all pixels
		prevtime = t         # Record time of last mode change

This code requires the library. A factory-fresh board will have this already installed. If you’ve just reloaded the board with CircuitPython, create the “lib” directory and then download from Github.

Last updated on 2017-09-28 at 06.55.13 PM Published on 2013-12-06 at 06.16.27 PM