I have begun work on a watch project, but it is not a connected watch. I'm just using the TinyScreen for the display. I'm planning to have a TinyDuino, the RTC board, and the display. I guess my questions revolve around battery life, as I'd like to have it powered by the coin cell, and last a long time. In my plan, the display remains powered off until the user presses a button to have the time displayed. Here are a few questions for starters:
- Will those three boards fit just fine in the watch case?
- Can a button on the screen trigger an interrupt so the CPU can sleep?
I'm guessing that if the answer to 2 is no, I'm pretty much sunk already. And if that's so, I'd suggest that it might be nice for a future rev of the board to have one of those buttons available that way, perhaps by cutting a trace and soldering a jumper. Anyway, if I can't use the coin cell, I guess I can use the lithium battery, but that means having to also include the USB board for charging, and makes maintenance a hassle, unless *4* boards plus battery fit in the 3D printed case.
Any other thoughts/advice?