How about a scientific instrumentation project updated for the 21st century (you know, add a Raspberry Pi, a BLE connection and an app)?
Maybe an electric field mill, or a hot ball anemometer, or a solar tracker, a UV radiation meter, a chaos generator...
The kind of gizmos I read about in Shawn Carlson's Amateur Scientist column in Scientific American.
How about a Low Energy Analog Test Equipment device with Remote Monitoring?
Yeah, a tough one for me to decide.
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