Digitise an older engine - ESP32

[MusaSailing]

Hi!

Thank you so much for your quick response!

Finally, I found a website that has the temperature curve! Just in case someone needs it for FAS only-one-terminal Temperature Sensor here you can find it: https://www.si-parts.com/en/temperature-...20045.html

I will try tomorrow once I get to my sailboat.

@Boatingbaileys I found another problem and don't know if you face it: I would like to keep the analog temperature clock. If I followed your voltage divider correctly, what happened is that when I connect the ESP32 to the positive and negative of the temperature sensor, the clock rise to 120º.

I am not an expert in electronics, just small projects, so I asked ChatGPT ? He is saying that sharing ground between ESP32 and the sensor generates a "Ground Loop" and that I should use an optocoupler/optoisolator.

Did you keep your analog clock? If yes, it is working correctly? Or are you just using the digital one?

Thanks!