I'm having trouble again with a set of relays. It is the small set that only has the two relays on the board. I've tried wiring them every way imaginable and they still won't work properly. The only way they will come on at all, is if I put my 5 VDC to the VCC terminal, and they will not actuate with the outputs from the controller. I've tried them with two different Arduino Uno's. I'm also not sure which is the proper placement for the jumper. I'm not sure what I'm doing wrong. Any help would be appreciated.
closed as not a real question by Olin Lathrop, W5VO♦, The Photon, Oli Glaser, Kortuk♦ Jul 16 '12 at 14:28
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You will need to provide more details for us to be helpful. I can't tell from your question whether you are working with standalone relays or some relay that are already a part of a PCB.
If it isn't soldered in place, test the relays by energizing the coil and testing for continuity with the ohm setting on your multimeter. To energize the coil, supply a voltage to the primary side and hook up the secondary side to your DC common, aka the ground. If it is a mechanical relay you will hear a click. Typically, relays use A1 and A2 for the primary/secondary sides of the coil and 11, 12, 14, 24, and a few different numbers for different contacts.
All of the pins should be described in the relay's datasheet.