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1  Using Arduino / Motors, Mechanics, and Power / Use a 5v relay to trip a 12v relay? on: October 26, 2012, 11:11:51 pm
What I thought would be a quick trip to Radioshack turned into three trips and much confusion.

What I'm trying to do is use my Arduino Uno to turn on and off a 120vAC device (bedroom lamp, Christmas lights, etc).

To make a long story short, the gentleman at Radioshack did not have a 5vDC relay that would handle >1A at 120vAC and suggested I instead use a 5vDC 1A at 120vAC relay to trip a 12vDC 10A at 120vAC relay. Made sense at the time.

So right now I have:

    5vDC relay, rated 1A at 120vAC (SPDT)
    12v relay, rated 10A at 110/120vAC (DPDT)

I bought a 10ft extension cord from Walmart that I cut in half; I want to wire the relays in the middle. So my question is: how do I wire these things up? Where am I getting the 12vDC to trip the second relay? Here's a picture of the two relays and their packaging:
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