Arduino Using IR Sensors For Remote Detection

How to wire IR sensor for remote detection on model railroads. Shows you how to easily add IR emitters and senors between track rails without having to cut large hole for sensor bodies.

IR detectors are normally provided with 5 mm LEDs.  These are too large to fit between HO scale rails.  By changing them to 3mm size they fit between the rails and fit there without detracting from the appearance of the layout.

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