Im using the internal pullup resistors built inside the Arduino’s .
pinmode (Pin#, INPUT_PULLUP);
You can direct short this internal resistor and read an analog sig as well. it is already in perfect range for detection.
The meter I have will not detect any resistance. The batteries maybe shot they are pretty old. The meter still works, but I should be able to at least get an ohms reading on the condensate. But Im not even seeing a reading there. This would be good info to know; however, I already have a usable reading for detection. Just need to learn how to build the sensor and implement it.
Hopefully this first probe design will work.
I dont follow APL and am trying to get away from any type of filters. This probe will be fairly easy to clean compared to filters and then the need to replace them.
This sensor should never go off. It is there to make sure tar is never ever an issue. If it goes off then corrective action is required somewhere. Something broke, bad fuel. clog some where etc. Fix the issue, clean the sensor and your back in business.