Now, the next one is the real deal. This is my second design. Not as tight and tiny but incorporates the full setup, including the LCD connector, programming/debugging connector, larger external antenna, flex PCB and battery connectors.

I plugged it in, and this time quite literally fell off my chair. No seriously my chair is on wheel and I slipped.

I used nail scissor clippers to trim the flex PCB. Plugged it in. Boom! The design worked out of the box, including BLE!

The pre-alpha watch in a box, testing the power consumption with a 200mA battery, BLE at -40db. Estimated life of that setup without any power tuning would be about 5000 hours (~200 days).

To give you an idea how hard this is, it takes a team of highly qualified people working for months to get to this stage. I did it over a few weekends in my bedroom listening to Gert van Hoef.