Proximity detector

Posted on Jul 9, 2012    10634

The proximity sensor works on the principle of transmitting a beam of modulated infra-red light from the emitter diode LED2, and receiving reflections from objects passing in front of the beam with a photodiode detector Dl

Proximity detector
Click here to download the full size of the above Circuit.

The circuit can be split into three distinct stages; the infra-red transmitter, the photo-diode amplifier, and a variable threshold comparator.

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