Original Arduino IR sensor module for train detection

On this module I separated the infrared sensor emitter and receiver. These details deployed relative to the rails by 45 degrees and are located at a certain height above the rails. Also on the receiver is a black slit mask that removes stray radiation.

The height of the sensor and the IR-LED above the rails for different scales is selected experimentally based on the minimum horizontal continuous line of wagons in your collection.

This design allows you to get a guaranteed signal of the presence of a train at the sensor zone. The system works correctly at any speed of the train, any the number of cars or types of cars and any length of the train.