As an Engineer, for a long time I have been saying "One day I will get into Raspberry Pi and Arduino".
I've got a Raspberry Pi model 4B which I am mostly using for Pi-hole. There are a few other things running on there but I find that I don't want to do too much experimentation as it's running an important network service.
I got hold of a Raspberry Pi Zero W, so now it's time to play! How much trouble can I get myself into with a single core processor?
Then I also acquired a Pi Zero 2 W which has 4 cores, so now I can get into 5 times as much trouble :)
I have some ESP-01S single 32 bit core microcontrollers and some ESP-32 (not shown).
These are my notes: