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Clearly I'm just winging the electronics side of things, I have only amateur knowledge I have ordered the following relay, http://vi.raptor.ebaydesc.com/ws/eBayISAPI.dll?ViewItemDescV4&item=261286454204&category=36328&pm=1&ds=0&t=1435542120862 Will it be safe to split the negative from a...

(Mine is 12v version) The PIR sensor simply allows 12v through, http://www.qiannipicture.com/pic/UploadFile/P0/SKU192518/8933CCCECB339ACE13E6D246439999D223C6179CC9D2369D7393D2649A3356CBC626CFC98123C6999DA0CC.jpg I just thought considering it's not powering anything, just signalling an alarm...

If we have a PIR that has a 12v signal wire but no ground/negative output is it safe to just use positive 12v wire to the camera without negative?