Capacitive Feedback for Resin Height

[quertz]

Hey guys,

It seems to me that we have a few different ways of measuring the capacitance:

jsondags Idea which resembles this:
https://www.arduino.cc/en/Tutorial/CapacitanceMeter
and uses the time needed to charge the capacitor;

The Peachy-Team's idea which is either
using an oscillator with a known frequency and measuring the resonance amplitude or
creating an harmonic oscillator using the capacitor and determining its natural frequency.

Looking at the second solution, maybe you could recreate that oscillator and hook it up to the interrupt pin of the arduino...
According to this http://arduino.datamaster2003.com/f-measurements.htm it should be easily possible to measure kHz-frequency with it which would give us some nice accuracy and keep it away from those annoying 50 Hz.

quertz