If I was to use an ACS712, software would need to sample the output. That sample would be in the form of a loop that would check the output say 1000 times. That would replace the filter. In order to achieve the voltage needed to drive the logic, that resulting output from the loop could be fed into another softwate program that drives an Arduino output signal which could be 5 volts DC. That output could then drive the signal logic via hardware or software. Just another way of achieving the same goal. The advantage here is that there would be no 1.4V drop. I may have considered this, but all 123 detectors are now wired and tested.
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