At the time of writing this guide, the sleep features of CircuitPython are under active development. As a result, you (currently) will need to use the "Absolute Newest" firmware release for this project. You can get it here:
This will eventually work with mainstream releases and we'll try and update this when that occurs.
This project uses the following BMP image files. Make sure you have a copy of them to the CIRCUITPY drive which appears when you connect your MagTag to your computer via a known good USB cable. You can download them here or via the project zip link in the code sections.
Since we end up only using a few of the MagTag's features, this project does not use the MagTag specific library. Therefore, you only need the following in your CIRCUITPY/lib folder: