Experimenting with the Raspberry Pi Pico.
I started by thinking I would focus on circuitpython but, given I have 2 Pico's, I decided I might as well also experiment with micropython - sometimes by repeating the circuitpython experiment.
The circuitpython experiments typically use the circuitpython Adafruit libraries - see: https://circuitpython.org/libraries for details on how to install and use the libraries. It's probably best to only copy the needed library files to the Pico to save space.
The experiments are in the cp_experiments and mp_experiments directories.
breadboard.FCStd is a FreeCad model of the breadboard/pico holder as seen in the shift register youtube video: https://youtu.be/eDOK4IY3GXE. It uses fricton to hold the breadboard and pico in place. It is designed to have the pico upside down with the power pin closest to the breadboard. The Pico and breadboard have a reasonably tight fit in this version of the model.