This guide has revisited a previous project using more powerful and feature rich hardware. The switch to a Feather M4 Express has allowed the use of a feature-rich device coded in CircuitPython. The Feather's generous I/O capabilities has made possible the use of an eInk display which gives the ability to display readings as well as informative and warning text. The Feather also provides in-place battery charging which makes the device far more convenient.

Going Further

There are a few ways to expand the project. First is making a printed enclosure that extends or mounts on the jar lid. Next is making a custom PCB rather than using hand-wired perf-board construction. Another direction is to enhance the display. A larger font would help with legibility, as would some icons.

This guide was first published on Feb 13, 2019. It was last updated on May 21, 2024.

This page (Wrap Up) was last updated on Mar 08, 2024.

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