I have a sensor which uses a moving inductor core to give a proportional output of frequency. I believe it is something like this: - the inductor coil is pin 1 and pin 3 - there is a capacitor between pin 1 and pin 2, and another capacitor between pin 3 and pin 2.
my capacitors measure 44 uF each but the info I have mentioned 22 uF? It says 5vdc on it. It apparently is supposed to output a frequency around 25 kHz. They are a very common washing machine water level sensor, 6601ER1006A or DN-S14T-H.
Can anyone suggest how I can read the output with an arduino?