Laser light

As I've mentioned before, I've got this ridiculously complex layout where three old DC trains are controlled by an Arduino so they run automatically.

To do so, I need to know when they pass certain points on the track. The IR sensors I've been using have been way too sensitive to different warmths of light, so I have resorted to using laser light and detectors. Hopefully that should fix some of the spurious triggering I am getting.

I do love a good bit of geek action :-)