I am working on designing a light bar about 30 inches long, that would have some type of beams at about 6in intervals casting parallel beams perpendicular to the bar. These beams would need to detect an object passing through them, displaying a flashing light, or illuminating a sensor light indicating that the beam was broken. It would need to be battery powered, and able to be turned on and off remotely by wireless. Has anybody got any ideas or could you refer me to where I could begin to read about components necessary to assemble this idea.