Hi Pierre,

Great design. I have a couple questions that I think are obvious but I want to double check
This is a screenshot of the basic components for each flip dot

1. Why have a second N-channel FET in front of the P-channel FET for FLIP_A_ON? Is it because you don't want to sink any current at that GPIO when the the pin is low? I ask because 12V / 100k = ~120uA and I'd assume the GPIO can sink in the 10s of mA no? I agree your design is more robust, but just a thought based on part count.
2. Any specific reason why you're using two separate pins for off and on instead of one and inverting the logic? Something like this:

I’m staring at the design, and I know from watching the breakfast vids that it works but I don’t understand how the current flows through the coil(inductor) when the charged side of the cap is connected to Gnd. Anyone know of a spice or other sim I could watch or play with. Or if someone could dumb it down for me. :)

Hi,

Nice work! I'm interested to push your design further, I see the used regulator can handle -20V to +38V so I guess it is already the more robust one. However it is unclear to me where you placed the free-wheel diode ? I would put it once per board between GND and 12V but wanted to ask for confirmation.

Thanks for your help

Are or would you be interested in selling one of these?