I am trying to build an RV theft deterrent for my motorhome. I don't want a system that alerts my smart phone to a break in. I am a believer in scaring the bad guys away before they cause damage. I envisage a wireless PIR that I can fix to the top of the coach windshield pointing 45 degrees down. Inside, and pointing out through the windshield is an emergeny vehicle LED flashing light red & blue. This light is powered by a 12 volt dash outlet. I need some kind of receiver /switch that can receive the motion signal and open the switch to turn on the LED light. This last component is the difficult one to find. Any ideas?

I am trying to put together a scare light for the inside of a motorhome to point out the windshield. I have a 12 volt 4 watt LED emergency vehicle light that I want to connect to a motion sensor. I cobbled together a PIR detector and the light and it worked OK. However I want the sensor behind the windshield for security and weather protection. The emergency vehicle lights are very intense and should be a good deterrent. I have read about a new type of radar detector that can see through glass whereas a PIR cannot. Does anyone know about these type of sensor and can recommend one that is adjustable for day/night as well as timing and sensitivity. I have several 12 volt outlets in the area where I would like to install.