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Author Topic: AXICOM IM03GR relay from arduino I/O pins?  (Read 318 times)
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South UK
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Hi all. I want to operate some of these http://uk.rs-online.com/web/p/products/4227063/?cm_mmc=UK-PPC-0212-_-03_Supplier_M-Z-_-TE_Connectivity_Electromechanical_Relays-_-IM03GR from an Arduino.

The coil resistance is stated to be 178 ohms so at 5V I make that about 28mA. Is this OK to draw from a Pin? I don't really want to mess around with a transistor to switch the current. 28mA seems a bit high in any case so could I add a series resistor to lower the coil current or would it not work?

Thanks
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28 mA should be OK.  Don't forget the reversed diode across the coil to absorb the inductive kickback.

There is a total limit of 200mA sourced or sunk.  If they might be on all at once you can only run 7 at a time. If you need to activate more than 7 at a time you can use a transistor and resistor to drive each coil.
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South UK
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Thanks for clarifying that John, very informative!

I shall give it a go.
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