At work we have much used door between the floor and the offices. As it has no window, there are a lot of near collisions. Adding a window is not an option.
Does anyone know of a system with a pair of PIRs and simple warning lights? Something where a person approaching the door would cause a light on the other side of the door to go on. I know I could cobble together something easily enough, but a commercial solution would be more likely to be approved.
Thanks,
-Brian