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Sensor Watch Pro

Turn a compatible digital watch into a coding project.

Watch boardProgrammableUSBSensor expansion

Price
$59
Availability
Listed
Design
Open
BuyCrowd Supply
Compare with similar devices

In stock at Crowd Supply when checked on 2026-09-24.

Bring along
A compatible Casio watch; choose display and sensor options.
Keep in mind
The base offer is a replacement board, not a complete watch.
Source checked · Sep 15, 2026
Sensor Watch Pro
Image creditMaker image · watch case sold separately · Oddly Specific Objects

(02) Blueprint

Build it yourself

Open hardware

Full KiCad schematic, PCB layout and 3D STEP models for the Sensor Watch Pro mainboard (rev OSO-SWAT-C1, with the 9-pin sensor connector) are public in the shared Sensor-Watch repo.

Sensor Watch Pro mainboard (OSO-SWAT-C1) KiCad schematic

Read straight from the maker’s repository. Open on GitHub

Sensor Watch Pro mainboard (OSO-SWAT-C1) KiCad schematic

GitHub

Design files 4

Source 1

git clone https://github.com/joeycastillo/Sensor-Watch.git

Key parts 1

Research notes

The repo README's hardware table (last edited 2025-02-15) lists Sensor Watch Pro as 'TBD', but board folder OSO-SWAT-C1 was added afterward by a commit literally titled 'Sensor Watch Pro' (2025-03-08) and contains a 9-pin FPC connector STEP model (FH19C-9S-0.5SH.stp) matching the Pro's sensor connector -- confirmed via `gh api` commit history, used as the authoritative mapping over the stale README table. On-board temperature sensor / IR phototransistor exact part numbers were not independently identified from the schematic within budget.

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.

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Made the Sensor Watch Pro? Put the badge on your README; it links here, with every shop that sells it.

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Specifications

Compute & sensing

5
Processor
Microchip SAM L22; Arm Cortex-M0+ up to 32 MHz
Memory
256 KB flash, up to 8 KB EEPROM emulation; 32 KB retained SRAM
Clock
32.768 kHz crystal and RTC; software frequency and temperature compensation
Sensors
Temperature sensor and infrared phototransistor
ADC
12-bit, with oversampling to 16-bit resolution

Display & controls

6
Compatibility
Replacement board for Casio F-91W and compatible A158W cases; donor watch required
Backlight
Red, green and blue PWM-controlled LED
Controls
Contacts for three interrupt-capable watch buttons
Audio
Inductor-boosted piezo buzzer
Optional LCD
92-segment display versus stock 72-segment; expanded icons and alphanumeric characters
Optional accelerometer
LIS2DW sensor board with activity, tap and interrupt support

Expansion & power

5
Programming
Onboard Micro USB; double-tap reset for UF2 drag-and-drop updates
Sensor connector
Nine pins: nominal 3 V, I²C with pull-ups and five GPIO
GPIO functions
Analog input, interrupts, digital I/O, SPI, UART, PWM and external wake; multiplexed by pin
Battery
CR2016 coin cell; maker comparison claims 1–2 years, dependent on firmware
In-case dimensions
34.5 × 37.5 × 8.5 mm in the referenced Casio case

Software

3
Firmware
Open-source Movement watch faces and applications
Online builder
Select watch faces and download a compiled UF2 image
Applications
Clock, alarms, stopwatch, interval timers, world time, calculator, games and TOTP
What still needs checking
  • The finished watch’s water resistance depends on the donor case and reassembly; it is not an independently tested rating for this modification.

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