Ghost Hand
Public Unreviewedby John Lauer
A small battery gadget that keeps an automatic sink faucet running while you use the sink: it learns the faucet's timeout, re-arms with the shortest blip, and stops after 10 minutes or when picked up.
Releases 2
Standalone per-platform binaries to download and run, no tools needed. The newest is pinned on top.
Rev 2, 2026-11-08: 30 x 22 mm two-sided Adom molecule (ATtiny1616, 2 layers, routed and poured, Adom Fields checked), Adafruit 1317 150 mAh LiPo charging at 77 mA, 38 x 32 x 17 mm sealed case aimed 5 deg up at the faucet's sensor window, four gauge lights plus a status light with UV laser engraved names, two IR emitters (850 and 940 nm). Silkscreen: each gauge name centred over its own LED. Design zip = board KiCad files, Gerbers, BOM, CPL, finished board STEP and GLB, case STEP/STL and engraving SVG, firmware hex and source. Gerbers zip = the fab files for a 3rd party fab.
Stable link for websites and docs: /download/john/ghost-hand/latest
All releases
Rev 2, 2026-11-08: 30 x 22 mm two-sided Adom molecule (ATtiny1616, 2 layers, routed and poured, Adom Fields checked), Adafruit 1317 150 mAh LiPo charging at 77 mA, 38 x 32 x 17 mm sealed case aimed 5 deg up at the faucet's sensor window, four gauge lights plus a status light with UV laser engraved names, two IR emitters (850 and 940 nm). Silkscreen: each gauge name centred over its own LED. Design zip = board KiCad files, Gerbers, BOM, CPL, finished board STEP and GLB, case STEP/STL and engraving SVG, firmware hex and source. Gerbers zip = the fab files for a 3rd party fab.
Rev 1, frozen 2026-11-08: 44 x 28 mm Adom molecule (ATtiny1616, 68 parts, 2-layer), 500 mAh LiPo, 54 x 44 mm case with the Adom logo light pipe and a four-segment charge gauge. J2 polarity fixed (pin 1 = VBAT). Design zip = the whole page as it stood (board, case, firmware, docs) without the film footage; gerbers zip = the fab files.