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How to replace light bulb load in a motion sensor circuit? Answered

I am using a outdoor light replacement motion sensor to trigger a relay which will turn on a fog machine for some Halloween effects. The setup is pretty simple and I am going to enclose the components in a project box so the motion sensor can be hidden near the walkway to my house.

My problem is the motion sensor requires the load of a light bulb in the circuit to operate so that the relay can be engaged but I don't want to have a light since this is suppose to be hidden in the dark. My first thoughts were to just replace the bulb with one or more resistors in the circuit but I am not sure if this will be possible or dangerous (in terms of heat).

How should I set up the relay circuit to have a load but not have a light bulb? Since my timeline to get this complete is the next couple days for Halloween I need to find options which I can source locally (radio shack, home depot, etc.). Any thoughts?

Discussions

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ecknight6754
ecknight6754

10 years ago

i am asuming that your fog machine is 110V.  Just hook up the fog machine to the internal relay of the motion light.  We did something like this for a project.  Except we needed 5V out.  Anyways all the motion sensor is, is a relay that when tripped turns on lights just replace lights with fog machine.  only problem i see is that fog machines take time to work (heat up).

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cbulloch
cbulloch

Answer 10 years ago

You're correct, the fog machine is 110V. My initial plan was to just use the motion sensor relay but for some reason I couldn't figure out how to properly connect it to the fog machine circuit. Which is why I went this direction.

I just need something that can replace the light bulb load that doesn't cause heat problems or create a big light source.

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cbulloch
cbulloch

Answer 10 years ago

I am considering a cell phone charger as the load for the short term. They are small, and don't put out much heat. It could act as the load.