Infrared Detection with 74HC04

Posted on Mar 22, 2013

The two basic parts for working with IR are the emitter and the detector. The emitter is typically an LED that emits near-infrared light. A typical wavelength is 880nm, which is just beyond the human eyes ability to see. Many suppliers, new and surplus, can provide you with sources of LED emitters. A typical IR detection system will use two emitters. By controlling when the emitters are active, the detection system can determine simple directional information: Left, Right, or Front.

Infrared Detection with 74HC04
Click here to download the full size of the above Circuit.

There are several types of detectors for IR light. There are photo-diodes, photo-transistors, and a couple others. Usually, you buy IR emitter/detector pairs, which are tuned for each other. This is recommended when buying surplus, since chances are someo

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