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Travis Goodspeed's Goodwatch might be interesting. It's a complete watch pcb replacement for casios, but the info there might give some ideas.
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I just got the crazy idea that I could stuff a 433mhz transmitter in there (smallest looks like 0.4" x 0.2"), and then I'd be wearing a watch that would know when I got home and send out the signal to turn the lights on and heat up the dab rig.
This can be done over existing Bluetooth LE without putting anything inside? the 433 transmitter could be attached to something else (let's say Pi Zero W or cheap nrf52 board) that sits at home and connects to the watch over BLE. Seems easier to me than breaking the watch.
AkosLukacs
fanoush
@DrAzzy
How much space is there for other devices in the watch?
I just got the crazy idea that I could stuff a 433mhz transmitter in there (smallest looks like 0.4" x 0.2"), and then I'd be wearing a watch that would know when I got home and send out the signal to turn the lights on and heat up the dab rig.