Existing Hall Effect Circuit - Need Digital Output
Okay. . Jeff had a good idea about using a "hall effect" circuit. In fact, the water softener already has one! Theres a probe just outside the Turbine Wheel and the wire is external and goes to the Control Unit Circuit Board.
So, there's obviously an existing circuit on the board that "counts" the revolutions of the turbine and makes the LED blink when water is flowing. IT knows how much water is being used, because that's how it determines when to regenerate ~ after a certain amount of water has passed through.
Now, how do I get that information out of there? Digital readout?
I measured the voltage across the leads coming from the "Hall Effect Probe". There are 3 ~ Red, Black and Green. There's a constant 10.5 volts between the Red and Green. When water is flowing, theres between 5.6 volts and 6.1 volts between the Red and Black. When water isn't flowing, I get 5.6 volts between Red and Black.
So can I either tap into the existing circuit and then feed the output to a digital readout that'll at least give me "total pulses" or, ideally, total gallons used or is there a way to make another circuit that feeds off of the 3 lines coming from the probe?
Thanks again in advance for your help!
PS I have some good close-up pictures of the existing board, probe, etc. if it'll help!