Quote:
Originally Posted by JamieGeek
Unless you disconnect the wires from the probes on the tank...
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The three tank probes go into a resistor network in the wiring harness at the probe. The output of the wiring harness is a single wire to the monitor. If you used the three tank wires to connect to the Arduino, they have a ladder network on the other end that would be in the way. Best to just snip out that mess.
I actually found I had 4 of those 4131-103 in my parts box. Unfortunately though, they are only 10KOhm.
5V should not be a problem. The ATMega can run on either 3.3V or 5V, and I think you will find a 5V regulator already on your board you could maybe use. Not sure if it can handle the current demands of the programmable resistor or not, but the UNO boards have a high power regulator for powering other devices.
See, I like to over-complicate things...