I’m interested in creating a compact, battery-powered version of the wireless plasma kit, without using a powerbank. Can I just solder headers onto the board and use a LiPo SHIM to power everything? Or am I overlooking something major?
I think you are missing three things:
- LiPos won’t provide 5V which you need for the LEDs. Now you might get away with less, but the idea of the plasma kit is to provide stable 5V and a level-shifter from 3V3 logic-level of the Pico to 5V for the data-line.
- soldering headers to the plasma-kit will be a real challenge
- The LiPo-shim is built for connecting from below, but below the Pico is the plasma-kit PCB
So all in all I would say this will never work. You could solder something directly to VBUS, but I don’t see any benefit compared to feeding power through the usb-plug.