Oddly Specific Objects
Sensor Watch Lite
Rewriting the firmware of a watch you already own.
Casio F-91WARM Cortex-M0+Open sourceLow power
Sold through Crowd Supply rather than the maker’s own shop.
- Bring along
- A Casio F-91W to transplant it into, and some soldering for the buzzer.
- Keep in mind
- No radio; the segment LCD limits what you can show.
Image credit
Crowd Supply project photo of the Sensor Watch Lite · Oddly Specific Objects(02) Blueprint
Build it yourself
Full KiCad schematic, PCB layout and gerbers for the Sensor Watch Lite mainboard (rev OSO-SWAT-B1) are public in the shared Sensor-Watch repo, per the repo's own hardware table.
Sensorwatch Lite mainboard (OSO-SWAT-B1) KiCad schematic
Read straight from the maker’s repository. Open on GitHub
Design files 3
Source 1
git clone https://github.com/joeycastillo/Sensor-Watch.gitResearch notes
Crowd Supply's Sensor Watch Lite page links github.com/joeycastillo/Sensor-Watch. The repo README's own 'Hardware Schematics and PCBs' table explicitly maps 'Sensorwatch Lite' (RED) to board OSO-SWAT-B1 -- distinct from plain 'Sensorwatch' (GREEN, OSO-SWAT-A1) and 'Sensorwatch Pro' (OSO-SWAT-C1, added later -- see that entry). Confirmed by reading the README table directly rather than assuming a folder name. Repo license: GitHub reports NOASSERTION (LICENSE.md has custom, non-standard text).
Every link checked 2026-09-27.
Hand this device to your agent. Everything on this page, as clean Markdown and JSON: specs, shops, prices, design files, parts.
Made the Sensor Watch Lite? Put the badge on your README; it links here, with every shop that sells it.
Specifications
Core hardware
4
Details from the project page
7
No matching specification. Try a chip name, connector or feature.
What still needs checking
- Crowd Supply project pages describe the campaign rather than a datasheet; dimensions, weight and full electrical specifications are often absent.
- Prices and ship dates on Crowd Supply change; re-check before ordering.
