Infrared Model Train Detector Circuit - schematic of the model train detector circuit working of the circuit is straight forward when light from infrared sender d1 is relected by the wagon of the model train ic1 through infrared photo sensor d2 receives the recovered signal at its input point pin3 model railroader is the world s largest magazine on model trains and model railroad layouts we feature beginner and advanced help on all model railroading scales including layout track plans model railroad product reviews model train news and model railroad forums this simple and economical ir model train detector circuit is intended especially for those hobbyists who wish to infrared remote control tester p marian 08 04 2010 ir train detectors infrared proximity sensors for detecting model trains on the track may be used as a reflective detector sensors in the roadbed or as an interrupt detector sensors look across the track schematic.

of the model train detector circuit working of the circuit is straight forward when light from infrared sender d1 is relected by the wagon of the model train ic1 through infrared photo sensor d2 receives the recovered signal at its input point pin3 coded pulsed infrared proximity sensors for detecting model trains on the track pulsing modulation allows the detector to ignore ambient lighting coded pulsing allows each detector to ignore the ir signals of other nearby detectors it briefly shows 5 volts on the output pin when a passing train reflects infrared light back into the detector although the software could be changed to deal with either sensor you would have to throw a switch or do something on the circuit board to let the program know which type of sensor was in use our system of train detection works by shining a beam of infrared upwards from the track if anything is above.

the beam it will reflect some of the infrared back when our boards see this reflected infrared they know rolling stock is above



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