IR emitter/reciever pair for close-range optical detection. This is a very popular infrared line/object sensor used in many robot designs. These sensors have an effective range of approximately 6mm (1/4"), which makes them ideal for line detection. Four leads. 1 Each Line/Object Detector (IR) BEMLOI$2.99 QRD1114 Datasheet (PDF) Copyright © 2003-2008 E-Clec-Tech. All rights reserved. All other materials and logos are copyrighted by their respective owners, or companies.