John H posted:
...I'm close enough for what I'm looking for. I will try it in a short tunnel. The angle with two sensors works up to 10" apart.
I assume you mean black heat-shrink tubing over the receiver (black sensor) to give it tunnel-vision? I'm thinking that in conjunction with adjusting the sensitivity control might increase your 10" range - not that you need more distance.
In the nit-picky department I notice lights briefly flicker at end of train...maybe beam going through the railings on the rear of the caboose? That would be an application for a time-delay circuit or a relay module with time-delay capability.
And are you planning to de-solder the emitter or just use "half" of two modules? If the latter, I'd cover the unused emitter so it does not get reflected back and mimic the beam when it hits a shiny car/engine with irregular features.
