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induction loop sensor
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johntg:
Im pretty new to circuit design so any help is appreciated.

I bought this induction sensor off of ebay hoping that it would have a relay built in to close a circuit to control my gate. However once received i discovered i received the solid state model that doesnt have a relay with a NO and Common connection rather an Emitter and collector connection. Ive done a bit of testing and im seeing a .2VDC change when the induction loop is triggered by metal. Im looking for help in designing a circuit that can use the emitter and collector connections and switch a Normally open relay.

thank you !!

http://www.renoae.com/product/root/0/82
Doctorandus_P:

--- Quote from: http://www.renoae.com/RelatedFiles/Model%20L-1200%20Data%20Sheet%20%2008-05-03.pdf --- Solid State Output Ratings: Optically coupled field effect transistors. 30 VDC maximum drain to source. 50 mA maximum current. 1.2 VDC maximum transistor saturation voltage.

--- End quote ---

The output acts as a switch. You need to apply an external voltage to it, just as with a regular switch or solid state relay.
soldar:
Wow, that seems like overkill for detecting vehicles on your driveway.

I could not find the pin-out for the connector. In any case, if it has an open collector output you can just use that directly or use it to switch a relay. A relay might not be a bad idea even if not strictly needed because it provides isolation and protection.
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