Sending a signal

[Blackwolf]

I am the project head for a section of the project being conducted within my university's engineering club. We are building something called a pain field generator which is a property protection device from an old science project book. How it is set up right now is the device may be modular and one portion of it would contain speakers while the other would contain the controls. My team is building the tripwire which we have handled. the only problem is I am drawing a blank on what we would use to wireless send a signal from the photoreceptor portion of the wire to a "switch" within the PFG some 10-15' away in the center of the room. I know I can setup another laser and shoot a modulated pulse to a reviver on the PFG, but I was thinking more along the line of how devices like the Nintendo DS locally connect wirelessly except on a smaller scale and simpler.

 

[Hemlock_Mike]

BW --- There are wireless units for sale which activate lights etc from small
handheld modules. These are usually found around Christmas time for tree
lights but are available at box stores for about $12. You will need to adapt
the circuits back to basic 12 VDC or whatever and bybass the triac driver.
HMike

These are usually powered by 120 VAC line but internal circuits usually
run at 12 VDC after the small PS circuit.