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Discussion Starter #1
I was thinking about picking up a random SPDT 12v relay from an automotive store connecting my 12v trigger on my projector and wiring the relay to the leads of the float switch inside the dehumidifier. It would connect to the normally open lead of the relay so when I power on the projector, it shuts off the dehumidifier that is in the same room.

As this is a low voltage application, is there any reason why a simple SPDT 12v relay from an automotive store not work?

I was also thinking of wiring this thing in series with my condensation pump so if the pump fails, it will kill the dehumidifier as well.

Thanks in advance!
 

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As this is a low voltage application, is there any reason why a simple SPDT 12v relay from an automotive store not work?
The control portion from the projector may be low voltage, but is the humidifier control circuit low voltage as well? I know your condensate pump is most likely 120V, right?

You need a properly rated and ul certified relay if you're connecting any portion of it to 120V.

You will also wreck any ul certification on the humidifier and pump if you open them up and play with the wiring.

Best bet is certified and compliant relay controlling an outlet which the pump and humidifier are plugged into.
 

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Discussion Starter #3
There is a microswitch that is triggered when the reseivoir is in place, it is attached to a small wire to the control board. I disconnected it from the board and tested it to verify it is the switch. If the circuit is open, then it stops the humidifier. I was thinking of splicing in the relay switch in series. I did think of doing a 110v relay for the outlet, though could't find a good guide on doing it.
 

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That will work fine. It's probably low voltage on the float circuit as well. You will wreck the UL certification on the machine though
 

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Discussion Starter #5
I decided to reuse some old x10 equipment I have. It required me to get one extra x10 controller.
 
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