It also uses the UART connection from pins 14/15. You can use extra long stacking headers to stack multiple HATs

The code for the mini version is public yes.

Yes, my larger version gets its location with gps and uses sunrise and sunset times to schedule wake times. You can do this with the Witty Pi if you want, but you have to write your own scheduling code, which I wanted to avoid for this version to make it easier for people to make.

Species identification, I'm training my own models

Video here youtu.be/qhY_3XCSYsM

You can find them on my youtube channel youtube.com/@lukeditria

I do for the LED matrix display.

makerworld.com/en/@user_392...