This is a derivated design from my entry for Hackaday 2024 Business Card Challenge Contest.
It shares the same firmware used in the business card project, it has the same BOM with the exception of the two buttons used and without the two 12-pin break-out connector. I found a 16mm-wide wrist belt from Aliexpress and bought a few of them with different colors.
The wrist watch is powered by a CR2016 coin cell battery (96mAh) and has a sleep power consumption of less than 2uA, the battery life would be more than 3 years based on viewing the time 24 times/day.
Thanks PCBWay for sponsoring the PCB fabrication.
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