2025 roundup

Here's some stuff I did last year. Pixelrings : LED earrings programmable in Python. RP2040-RS232 : RS-232 adapter with an RP2040 chip. Can be used to adapt ancient serial mice or 3D mice for modern systems or as a generic serial-to-USB adapter. Some new Flatbox revisions: rev4.1: an updated RP2040 variant with a USB host port rev4.1wasd: same but with a WASD layout rev8: an RP2350 variant with a…