Originally Posted by
Bernett
When I ran my OS engine with the Stirlingkit CDI I attached an electronic tachometer to it using a Y connector to the hall sensor line. It worked. Which means you should be able to obtain rpm data using a Y connector to possibly a arduino or 32 chip. Then you could program your controls to try to match rpm’s through your throttle curve. It is easy for me to suggest that but I’m sure more difficult to actually accomplish.
The hall sensor likely gives a 5v level output pulse.
The esp 32 series want a 3.3 volt level signal and might be damaged by a 5 volt signal.
To make this work a "level shift" circuit needs to be put in between to make 3.3v out of the 5 volt.hall sensor output
https://www.espboards.dev/sensors/ky-051/ is a example that could work.