Hello, I am fixing a project right now that is a rube goldberg machine, activated by people walking by. What I want is when someone walks by, it sends a signal to some timer, and then runs the motor that lifts balls up for just one second. So I'm looking for two devices, and I just can't find what I'm looking for. This runs at 120V, and doesn't need varying speeds or anything, it just needs to run for 1 second when a person passes by. I assume that'll take a motion sensing device (preferrably somehting small and hidden like a photoelectric switch) and a timer device.