I was looking at the way they did the position sync. And they didn't :( OK, here's how I'd do it: add small magnets at the bottom of the clock hands, and use t

I was looking at the way they did the position sync. And they didn't :( OK, here's how I'd do it: add small magnets at the bottom of the clock hands, and use the ESP's built-in Hall effect sensor to detect them. You can distinguish between hands using the magnetic field orientation.