If you use Claude a lot, you end up checking your rate limit all the time. I got sick of refreshing claude.ai/settings/usage, so I wired up some old-school analog voltmeters and put them on my desk instead. There are apps for that, but I wanted something I could glance at in the real world.

They're 91C4 DC voltmeters, the ones with a needle from old lab equipment. Up to seven. Claude rate limit, CPU, GPU, memory, disk, network - you pick what each one shows.

I vibe-coded the whole thing except the PCB layout with Claude Code. Rust firmware for a CH32X033F8P6 $0.15 RISC-V MCU, Tauri desktop app, OpenSCAD (script CAD) housing you can 3D print. Also made a web tool for designing the gauge face graphics.

Everything is open-source and open-hardware. Firmware, app (macOS/Windows/Linux), PCB design, gerbers, BOM, SCAD/STL files are all in the repo. Order the PCB assembled from JLCPCB, solder wires to the voltmeters, print the housing, and that's it.