Electronic – arduino – use a reed relay instead of a reed switch with an Arduino to detect when a magnet is close

arduinoelectromagnetismrelay

I'm using this device:
http://www.radioshack.com/product/index.jsp?productId=2062478

I found this on how to wire it to an Arduino:
http://gncarduino.blogspot.com/2013/04/reed-relays-why-would-i-want-to-use-one.html

Could I somehow utilize this just to test when a magnet was next to the reed relay? Or will an external magnetic field not trigger a reed relay? (is it magnetically shielded perhaps?)

If this is possible, I'm not sure how I'd alter the wiring in place of device I want to control because I just want to use the magnetic field detection with no device to control

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Best Answer

Simplest answer. Try it. The relay is an electromagnet. It depends on magnetism to work. It might be shielded, it might not. Use the continuity feature on a multimeter and a magnet and test it.

If it works, you would wire it like you would a regular reed switch, with the L2 pins connected to ground and an Arduino digital pin set to input (with pullup).

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