While looking for something else, I found the old sample AVR processor I got at a trade show. This thing is about as powerful as an early Apple][ computer. When I got it I connected it to some fine wires salvaged from a power cord and was able to read the device signature. I may have some even smaller ones somewhere. Downside is they need about 2.7v to run although I think the brownout can be set to 1.8. Not sure how small a charge pump can be. Went through that pound of mostly fake chronograps I got from goodwill, So I do have some movements I can use for testing. Curious that the decent stuff like Omega and Heuer do not sell for the low scrap prices the Fosil, MK, and DKNY watches sell for.