Hall-Effect Tachometer

[GeorgesOatesLarsen]

Should get these thoughts written down as an issue,

Here are the two candidates I am looking at, as far as tachs are concerned:

Good, but it is latch:
https://www.digikey.com/en/products/detail/texas-instruments/DRV5011ADLPG/11625531

Good alternative:
https://www.digikey.com/en/products/detail/diodes-incorporated/AH3365Q-P-B/6575183

Around 5mA draw, excluding power drawn by readout supply, but that should be tiny since the ESP32 is CMOS.

[GeorgesOatesLarsen]

Through-hole hall-effect sensors, since they have a sensitivity axis conveniently perpendicular to the board plane!