3 - 80cm E18-D80NK Infrared Proximity Sensor

This Infrared Reflectance Sensor Module carries a single infrared LED and phototransistor pair in an inexpensive, tiny module that can be mounted almost anywhere and is great for obstacle detection of robot and home alert system.The optimal sensing distance is within 50cm (20 inches). Building interactive work is as easy as piling bricks, just plug it to our Arduino Sensor Shield with a buckled cable, and make it looks professional and neat.The Infrared Reflectance Sensor Module simply gives a digital signal when it detects infrared reflection from a person or object, so the code is exactly as the one we would use for a push button. The infrared proximity switch module is a reflection-type photoelectric sensor which integrates transmitting and receiving infrared beams function. Infrared proximity switches work by sending out beams of invisible infrared light. A photo-detector on the proximity switch detects any reflections of this light. These reflections allow infrared proximity switches to determine whether there is an object nearby.