// vet · a soldering check-up

Diagnose my cat

Built a Sheen, or added a radio, and want to know it's soldered right? Plug it in over USB-C. The vet looks at every pin the way a multimeter would, checks neighbouring pins for solder bridges, asks the LoRa radio to identify itself, listens for the antenna, scans the sensor header, then reboots the board and watches its firmware come up. Nothing is written to flash — whatever is on your cat stays on your cat.

=^..^= what you need
A desktop browser that speaks Web Serial (Chrome or Edge), a data USB-C cable, and your Sheen. If it doesn't answer, hold BOOT while plugging it in.
Ready when you are
Plug in your Sheen and press Diagnose.

What the vet can see: rest levels with only the chip's own pull resistors, whether neighbouring module pins are shorted, whether the LoRa radio answers over SPI and hears anything through its antenna, I2C pull-ups and devices, the flash and PSRAM fitted, and how the board boots. What it can't: LEDs lighting, speakers, anything that needs firmware timing — for those it hands you the running firmware's own controls when it recognises it. It only reads memory, toggles pins the way a multimeter would, and resets the board. Flash and eFuses are never written.