Digitise an older engine - ESP32

[MigGat]

Hi, I’ve just added fuel consumption (predicted based on RPM) so if that’s works I’ll share all the code either on GitHub or on here. Plan to test that this next week.

I have just used the examples and stuck it all together but happy to share.

That'd be interesting!

On another topic, I tried today the same solution for the RPM counter, just that it didn't work on my side :/
Tried the exact same critcuit from boatybits/boatymonpy and after testing it at home successfully, tried to connect it to the actual alternator, but 2 things happened:

1) The existing (old style analog) RPM counter stopped working. After disconnecting my circuit worked again.
2) The voltage between connector 1 and 2 from the schematic was 1.9V DC 

   

Any idea what could I have done wrong?

Now that I see the schematic again.. I might I might have reverted the terminals. Ground should go to 1 and W from the alternator should go to 2, is that right? Cause I did it the other way around.

Also, since there is only 1 power source, the ground can come from anywhere? Or is there something specific of the alternator?

Thanks a lot!