Site icon Pallav Aggarwal

Watchy: An Open Source E-Paper Display Watch

Watchy is an ESP32 based smartwatch that uses e-paper display, fully open-source, both hardware as well as software.

Watchy is designed and manufactured by Squarofumi (SQFMI) the same company that also built the Badgy (Badgy is a rechargeable IoT badge with an e-ink display and WiFi connectivity).

It has a minimalistic design using the PCB as the watch body, although users can customize it with different 3D printed enclosures and watch straps.

It is a smartwatch that is also a wearable development platform, allowing users to create their own experience.

What features it has?

ESP32 Pinout

ESP32-PICO-D4GDEH0154D67BMA423DS3231Battery ADCUARTButtons
GPIO 1TX
GPIO 3RX
GPIO 4Button 4
GPIO 5CS
GPIO 9RES
GPIO 10DC
GPIO 12INT2
GPIO 13
GPIO 14INT1
GPIO 18SCLK
GPIO 19BUSY
GPIO 21SDASDA
GPIO 22SCLSCL
GPIO 23MOSI
GPIO 25Button 2
GPIO 26Button 1
GPIO 27INT
GPIO 32Button 3
GPIO 33 ADC

Main Component Datasheets

Open Source Hardware & Software

Watchy is fully open source under the MIT License and OSHWA-certified.

How much is Battery Life?

As per their documentation:

Watchy wakes up every 60 seconds to check the accelerometer, real-time clock and updates the E-Paper display with the latest information. Certain watch faces also turn on WiFi to fetch weather data.

With only timekeeping, Watchy should have a battery life of 5-7 days, while with fetching data over WiFi, it should last between 2-3 days. These numbers can be extended through further optimizations (e.g. sleep during off-hours, waking up only on motion/tilt, etc.).

What could be done better?

Read more information on low power embedded systems design considerations.

What is the cost, where to buy from?

One can buy Watchy from crowd supply, it had a successful campaign.

Watchy is a very good wearable development platform for developers and I can’t wait to see interesting use cases it can be used in.

If you are interested in an E-paper display, this might be useful for you.

I hope you found this post interesting.


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Read my other articles on embedded systems design.

Happy learning to you!


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