This is a VERY Beta version of some code I wrote for a BB gun based shooting gallery.
The basics of it, you use metal spoons that make contact with a back plate that completes the circuit.
When this occurs, it triggers the target being hit.
I have test code I still need to clean up, for items such as a shot counter (using a MIC), time between shots, hit counters, reaction timers and the like.
More details in the forums.
Shooting Gallery on our Forums
Rough Demonstration on Youtube