Ok, the FMM uses a 3.5mm jack similar to headphones for its 4 inputs, but looks as if each jack has 3 or 4 contacts. I would assume these contacts are ground, a power (+5VDC likely), and one or two signal wires.
Power and ground, obviously to power the sensor circuit for flow sensors and optical sensors. One signal port to send the open/closed when using the optical sensor, either full ground or full 5VDC. When placed in flow mode, sends a voltage based on speed of the pump. Or that is at least what I would expect.
Reason I am asking, I have a thought of adding a fluid level sensor to my FMM using the sensor in the link:
https://www.adafruit.com/product/265...4mJyOKYKlAaWNY
Obviously not supported, but if I knew the basics of the voltage in/out, I could adapt the sensor to the Apex. Anyone have any luck with something like this?
Thanks in advance!
Dan
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