My Cart

Using Optical Switches. How do they work?October 22, 2012

breadboard -300Applying micro controllers to the real world often involves sensing motion, position or the proximity of objects.  A very simple sensor is the optical switch consisting of an IR LED emitter and an IR-sensitive phototransistor.  These can be arranged to detect directly transmitted light (photo interrupter) or the reflection of light (proximity detector) and they can be packaged into a self-contained sensor or used as separate emitter / receivers.  The photo below shows an interrupter type and a proximity detector type that may be purchased for less than a buck a piece.

Via and Source: Digital DIY

Leave a Reply