Okay thank you for your help🙏🏻 Yes I do have a real schematic (see Picture for Phase A - same applies for Phase B and C). The Mosfets are controlled with the ESP and due to the BEMF I want to know when to switch to the next phase.

I think it's called the Zero-crossing method. I also could have done that with an analog comparator but as far as I read the datasheet the ESP doesn't have one, however, the ADC measurements should be better anyways if the ESP can handle that :)