Nick Bild shows how one can keep tabs on their fitness with a C64-themed smartwatch that wirelessly syncs data to a Commodore 64 computer.

The project uses an Arduino Micro and a LilyGo TTGO T-Watch-2020 V1.

I previously built the C64 Watch, which is a Commodore 64-themed Lilygo T-Watch 2020 with an onboard BASIC interpreter. But for a smartwatch to be really useful, it needs to be able to sync with a computer. Sure, I could easily sync it with a modern computer, but I thought it would be way more fun to come up with a way to wirelessly sync with an actual Commodore 64 computer.

The C64 Watch has an onboard infrared transmitter, so it is possible to encode any arbitrary data into a series of IR pulses. I used an IR receiver paired with an Arduino Micro to decode IR signals sent by the watch, then put that data, along with a latch signal, on pins of the C64’s user port.

See the video below and more in the post here.