First, I am a complete newbee. I help to provide the technical support for a high school television program. We would really like to set up a wireless tally system for our live productions, mostly sports, and seven camera. We use a tricaster which provides approx 3V to one of eight db15 pins, depending on which camera is selected in the switcher. Basically I need to take that numbered input (pins 1-7) and based on that input, have a corresponding led shine on a box attached to the camera. Transmission range needs to cover a football field or baseball diamond, so 100M or so line of sight. Anybody out there that can give me a guiding hand? I teach physics so have the ability to understand most of what people say, and am reasonably technically oriented. I have some limited coding experience (old stuff like basic and fortran 4) so can probably work through it if pointed in the right direction.
I know that there are options available to purchase, but two things interfere with that. One, they are expensive, and two, I think I would have fun (and the kids have fun) building them and solving out own problem.