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Discussion Starter #1
Would it be possible to take the 12V from the Computer Power Supply (CPS) and run it through a security light motion detector. I would like to use the motion sensor as a trigger.
 

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All you need is a relay with a 110V coil . Just hookup the relay coil to the sensor and run the 12V through the relay.
 

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Discussion Starter #5
Man, I knew you'd be the guy to answer me this!

So Mr, Wookie...can you give it to me a bit more in Lay Man's language. I see a lot of "relay with a 110V coil" on the web when I google it...some as much as $60...So for the Garage/home haunter with less than 36 days to setting up...what my solution?
 

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You can get a relay from Radio Shack for $10.99. http://www.radioshack.com/product/index.jsp?productId=2049721

Or my favorite store for electronic parts All Electronics for $1.75. http://www.allelectronics.com/make-a-store/item/RLY-453/120-VAC-RELAY-DPDT-12-AMPS/1.html



All you do is connect the wires that go to the light socket in the sensor to the coil inputs on the relay. Then connect one of the wires (lets say the +) from the 12v power to the COM connector on one side of the relay. Then connect the positive wire from the prop to the NO (normally open) connection on the same side of the relay and connect the negative wire from the power supply to the negative wire on the prop.

There is a simpler way of doing this if all you want to do is supply power to the prop when the sensor is triggered. Just connect the prop to the power supply and plug the power supply into one of those light socket plug adaptors screwed into the sensor's light socket. Of coarse this only works if you're only trying to power this one prop.
 

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Discussion Starter #10
ok just to clarify before I plug this thing in and hope for the best....

I am using a section of a power cord with the female end cut off.
 

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Discussion Starter #12
then the positive wire from the 12V supply to the Common on the relay and the positive from the motor to the Normally Open terminal on the same side of the relay...? Then just connect the Neg's together.
 

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So I connect the black and white wire to the Coil terminals on the relay...?
Ok, you have a black, white and green wire on the cord that goes to the wall plug and a black, white and red wire on the sensor. Connect the black and white wires on the cord and sensor black to black and white to white. Just ignore the green wire, there's no ground on the relay or sensor. Connect a piece of white wire (just to keep the color coding consistent) to the white wires you connected. Connect that white wire to one of the coil terminals. Connect the red wire from the sensor to the other coil terminal. The sensor is now setup to activate the relay.
 

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Discussion Starter #16
Ok, got it wired all up and when I run (plug it in) it just doesn't stop running. Doesn't seem that the motion detector is even working. The only time that the motor stops running is when the relay clicks over. But that is for a short second and then the relay clicks over again and it begins again. Side note, I have not put the capacitor in line yet; don't know if that is an issue or not.

 

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What sensitivity level is the sensor set to? It looks like the sensor keeps tripping so it might be set too high. Since the sensor detects changes in the IR image it "sees" even a slight movement of the sensor or even a car driving past a window in its field of view will register as a change. Try putting something solid about a foot or so in front of the sensor. We need to find what is causing it to unintentionally trigger. I'll check back in a little while I've got something I need to do right now.
 

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The electrical tape is covering the light sensor? I'm assuming it's one of those sensors that only works at night. Maybe the tape isn't as opaque as it looks. It all depends on what wavelengths the light sensor is sensitive to. If the light sensor is right on the edge of disabling the sensor for daytime it 'could' be the issue. I'm baffled as well and I'm just trying to eliminate possibilities here.
 
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