Quote:
Originally Posted by Alan Anderson
I'm guessing you were looking at the black output wire of a QS18VN part, and that you didn't have a pullup resistor connected to it. That output will be pulled to ground when no object is present, and it will float when an object is detected. You were likely seeing ambient 60 Hz noise being picked up by the wire.
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Yes that does indeed make more sense. Now that I think about it, even if it were pulsing HIGH/LOW signals, it would have formed a square wave, not the analog sinusoidal wave that I observed.