The firmware and docs are public at github.com/propexperience/tinker — read, modify, contribute. (License being finalized, likely MIT for firmware; hardware design files to follow — #89.)
No — it's a standalone tinkering board driven from a serial console over USB-C. No app, no Bluetooth pairing, no cloud — by design. (The radio hardware exists if your own firmware wants it.)
Yes — that's the point. The stock firmware is one file (src/main.cpp); edit and pio run -t upload. Recovery: hold BOOT, tap RESET, release BOOT.
USB-C alone runs the board, console, sound, and display. The separate 9–24 V supply is only for real loads on the outputs.
12-volt-class loads — lights, LED strips, solenoids, small motors — up to 1.5 A each (rating — #98), wired between a 12 V pin and an OUT pin, flyback diode on anything with a coil.
So every output idles OFF while the board resets or sits unprogrammed — a safe default.
Powered ones (or headphones/an amp) — the jack is line level ("5w" marking being reconciled — #96).
MicroSD, FAT32, MP3 files; dot-files are skipped.
Yes — once powered, the firmware runs on its own; the console is just how you drive and configure it.
No — see "Is this like the other PropX controllers?".
The repo's issue tracker and CONTRIBUTING.md; the hardware reference is the single source of truth for wiring.