it is a good idea to incorporate the transmitter and the receiver into the same box and use some refelctor. This would also allow us to have use plug/sensor. We will evaluate this idea. Thanks. This is a really good idea.

We are trying to keep the system as simple as possible, so the whole system would be wired. Wires between the sensors (TX, RX) and the cameras as well. Radio control would be definitely more comfortable but also more expensive and less reliable.

For my own purposes, wires are no problem. However I want to keep system latency as low as possible and radio interfaces would introduce an additional delay (as it needs coding-decoding plus loads of communications problems has to be addressed). I think, that at least in the beginning we will stick to the wires.