The QTR-1A reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following applications. This sensor is sold in packs of two units.
Want to move quickly from prototype to permanent project? Transfer your half-size breadboarded circuit to this convenient breadboard compatible protoboard (with mounting holes & silkscreening) to create a rugged long-lasting prototype! This version has internal and external power rails
This troubleshooting tool communicates between a PC and any embedded device over most standard serial protocols and a range of 0-5.5VDC. It's a tremendous help when reverse engineering, troubleshooting, observing new hardware, and/or when needing to generate a test signal.