Pimping my Casio with Oddly Specific Objects' alternate motherboard and firmware
What would be the most power-efficient way to get data or code into something like this without having to take the back off or add a port? Maybe a light sensor, like the old Timex watches? <a href="https://en.wikipedia.org/wiki/Timex_Datalink" rel="nofollow">https://en.wikipedia.org/wiki/Timex_Datalink</a><p>I guess you could do it with a peltier element and the temperature sensor, if you had a lot of time. :)