I have not been able to locate banner sensors which operate as a trip wire type. All of the garage door sensors that I have come across have two wires laminated together with one having a solid black line running on the side. Im guessing that these are positive and negative wires but they could just as easily be one signal and one AC I suppose. But we need DC. Im also welcome to getting a cheaper sensor as garage sensors run at about $40 a set. Any help would be appreciated!
