Installing the CircuitPython Library Bundle

We're constantly updating and improving our libraries which provide functionality to CircuitPython. You can find example code in the guides for your board that depends on external libraries. Some of these libraries may be available from Adafruit, some may be written by community members.

Either way, as you start to explore CircuitPython, you'll want to know how to get libraries on board.

You can grab the latest Adafruit CircuitPython Bundle release by clicking the button below.

Once you've finished setting up your GEMMA M0 with CircuitPython, you can add the libraries to the lib folder of the GEMMA's CIRCUITPY drive which should appear when the board is plugged into your computer via a known good USB cable.

Copy this folder:

• adafruit_bus_device

And these files:

• adafruit_dotstar.mpy
• adafruit_pypixelbuf.mpy

To the CIRCUITPY flash drive /lib directory (create the directory if it doesn't exist).

Then, you can click on the Download: Project Zip link in the window below to download the code file. Take code.py from this zip and put it in the main (root) directory of the CIRCUITPY drive.

# SPDX-FileCopyrightText: 2021 Jeff Epler for Adafruit Industries
#
# SPDX-License-Identifier: MIT

import time
import adafruit_dotstar
from rainbowio import colorwheel
import board
import touchio

pixel = adafruit_dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1, brightness=.1)

touch = touchio.TouchIn(board.D1)

hue = 0
while True:
    hue = hue + touch.value * 3
    if hue > 255:  # Wrap back around to red
        hue = hue - 255
    pixel[0] = colorwheel(hue)
    time.sleep(.05)

# SPDX-FileCopyrightText: 2021 Jeff Epler for Adafruit Industries
#
# SPDX-License-Identifier: MIT

import time
import adafruit_dotstar
from rainbowio import colorwheel
import board
import touchio

pixel = adafruit_dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1, brightness=.1)

touch = touchio.TouchIn(board.D1)

hue = 0
while True:
    hue = hue + touch.value * 3
    if hue > 255:  # Wrap back around to red
        hue = hue - 255
    pixel[0] = colorwheel(hue)
    time.sleep(.05)

Review

Make sure you've followed these steps:

• Loaded all the required library files and directories into the CIRCUITPY /lib directory
• Copied code.py to the main (root) directory of the CIRCUITPY drive

The storage available in the GEMMA M0 is limited. If you're having trouble getting the files and folders to fit, check out these troubleshooting steps.

Press and hold a fingertip against the "D1" pad. The DotStar LED should cycle through a rainbow of colors while D1 is touched, and show a solid color when D1 is not touched. If it doesn't, make sure you copied the files and folders as shown above. If you're still stuck, you can use the CircuitPython REPL in Mu to troubleshoot the problem by viewing possible error messages.