- each output lights a red/orange led on the module when active - so a light sensor would be something but they seem to be analog mostly
Would it be possible to solder on a line to sense when voltage is present on each of those LEDs? That would be the cheapest option I can think of presuming there's a LED for every output you're wanting to detect activity on.
Train inhabitants to turn light off when not in use - cheap, safe and ups your claim to be the alpha dog
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