Laser train detector for model railroads
thingiverse
Mounting plates for a KY-008 650Nm laser and a photocell, configured for use in a model railroad occupancy detector. Lase3r sits in one plate on one4 side of the track, and the photocell sits in the other across the track. When installed they should be aligned so that the laser hits to photocell. When a train is present it prohibits the photocell from seeing the laser, giving you a change in condition detectable with an Arduino microprocessor. I have code for an Arduino that throws a relay when a train is detected with this laser. Very easy to write yourself, but message me if you need it.
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