He finally got around to etching this ATtiny85 programming adapter. If the project is not pin hungry, an ATtiny85 can run Arduino sketches without the need to port the code. The best news is that ...

[EloquentArduino] has been pushing the limits to the low end of the scale, and managed to get a basic classification model running on the ATtiny85 ... basic ML on an Arduino Uno, and Lego sortings ...