Sensor Watch<br>Sensor Watch: a board swap for the classic Casio F-91W wristwatch<br>Get Started<br>Order at Crowd Supply
Sensor Watch is a board replacement for the classic Casio F‑91W wristwatch. It is powered by a Microchip SAM L22 microcontroller with built-in segment LCD controller. You can write your own programs for the watch using the provided watch library, program the watch over USB using the built-in UF2 bootloader, and then install the board in your existing watch case to run your own software on your wrist.
Smart ARM power<br>Sensor Watch is powered by the Microchip SAM L22, an ARM Cortex M0+ microcontroller with tons of powerful peripherals.
Long-lived battery<br>Sensor Watch sips single-digit microamperes of power, making this a watch you can wear all year on a single coin cell.
Timeless Timekeeping<br>A highly accurate 32.768 KHz crystal keeps accurate time — and displays it on the original F-91W LCD for a classic look and feel.
Light and sound<br>The LED backlight supports shades of red, green and yellow. With light soldering, you can also use the F-91W’s piezo buzzer.
Sensor Extensible<br>A 9-pin connector breaks out an I²C bus and five GPIO for SPI, UART or analog input, letting you add sensors to Sensor Watch.
Open Source<br>Fully open source hardware and software allow you to buy one or build your own — and remix the firmware to suit your taste.
Preorder at Crowd Supply!
Join the Sensor Watch Discord!<br>Chat with other Sensor Watch users and get help with your own Sensor Watch build.
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Contributions welcome!<br>We do a Pull Request contributions workflow on GitHub . New users are always welcome!
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Follow along on Twitter!<br>Get the absolute latest from the developer of Sensor Watch, plus other posts.
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