Close Range Object Sensor - detect objects at closer ranges with greater precision

Modulated IR Detector Kit, (Item #3-337) SRP $21.95 Detect objects without physical contact! This tiny kit emits a beam of modulated infrared light & watches for the reflection, recognizing its own "carrier tone" it rejects all other signals, even of the same light wavelength! Includes all parts, tiny PC board (just 1.8 x 2.1 x 0.9 cm) and complete instructions. Requires careful soldering. Power it with 5V, standard TTL output. Detects up to several inches away (depending on surface). You can even extend the emitter and detector with fiber optics for precision detection.