searching for AC signal presence sensor with digital output, adjustable threshold

tom reaney's picture

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Joined: Jun 08, 2019

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searching for AC signal presence sensor with digital output, adjustable threshold
June 8, 2019 - 1:13pm

i am looking for an off the shelf sensor that can sense a wire buried 100mm underground (my soldering and custom circuit days are long behind me). my initial thought is to sense frequency signal strength. wire is carrying 230v, 50hz, 50mA although current can be upped if required. ideally sensor should have a digital output with sensitivity/threshold trip value adjustable for calibration.

im looking at eddy current sensors - too expensive,  hall effect sensors, inductive proximity sensors but cant see the wood for the trees.

any ideas, inspiration or thoughts gratefully received.

thanks,

tom.

 

Aswinth Raj's picture

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Joined: Aug 16, 2016

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off the shelf methods are not cheap
June 8, 2019 - 1:42pm

I think what you are trying to do is detect wires that are routed inside the walls. Well there are many ready made toold available for that but they are a bit expensive. The most crude way is to use a clamp meter in NCV mode. These meters have hall sensor and well beem when they come across a wire. However the trade off will be with acurracy and the wire should be live for this to work