Water quality of two electrodes, in one of the electrode as a reference, how to output positive and negative level? Water quality of two electrodes is also the two IO mouth of the single-chip microcomputer control, the circuit diagram is as follows, PA, PB as the two electrodes, PROBEA, two PROBEB by microcontroller IO port,

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Such signals, probably only a DAC giving?
If the difference signal, DAC with + op-amp can be good, after all, with two DAC MCU is not too much,