joeycastillo/Sensor-Watch
A board replacement for the classic Casio F-91W wristwatch observed · 2026-08-28
Health v2 · maintenance only
66/100
- Activity 76
- Release rhythm 35
- Longevity 100
Flags: no_releases no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 1971
- days_rel: n/a
- days_push: 147
- n_releases_24m: 0
Adoption not part of the score
2054 stars · 309 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Sensor Watch is an open-source replacement main board for the classic Casio F-91W wristwatch, built around a Microchip SAM L22 ARM Cortex-M0+ microcontroller with a segment LCD controller. The repository provides a C watch library and UF2 bootloader workflow so users can write, flash, and run their own custom watch firmware and sensor boards.
Use cases
- write custom firmware for a Casio F-91W watch
- build a programmable smartwatch with my own sensors
- replace the F-91W board with an open hardware alternative
- learn embedded C programming on a wearable device
- add custom sensors to a wristwatch via I2C or SPI
- flash watch apps over USB with a UF2 bootloader
When to choose
- you own a Casio F-91W and want to run your own software on it
- you want a low-power, hackable wearable platform with a segment LCD
- you want to experiment with custom sensor boards over a flexible connector
When to avoid
- you need a full-color display or touch interface
- you want a ready-made consumer smartwatch with app store support
- you are not comfortable with soldering or opening a watch case
Facets
library · maturity active
embedded sdk graphics embedded-systems hardware developer-tools embedded c cpp casio-f-91w wearable microcontroller firmware saml22 open-hardware
1 source
- readme: https://github.com/joeycastillo/Sensor-Watch · fetched 2026-08-28 · 998b0ccd7253
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| joeycastillo/Sensor-Watch | main | 66 |
For agents
markdown · JSON · MCP: product_card(name="joeycastillo/Sensor-Watch")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem