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I like the way you set up the switch. mounting Looks sturdy enough and the switch itself is beefy. My main concern was whether or not my switch would be able to handle the abuse. An omron microswitch...

I'm under the impression that the frequency setting is just that. An adjustable bandpass filter. What you hear on the headphones may or may not be exactly the same as what the software hears but...

I like the fact that it has an audio output. Actually being able to hear what's triggering it during initial setup would give me confidence in it. It could even be recorded simultaneous to a datalog...