Low-cost Position Sensor

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< PIC Project ~ Low-cost Position Sensor

eric

Posted: Sun Aug 27, 2006 10:22 am Post subject: Low-cost Position Sensor

Site Admin Joined: 01 Jan 1970 Posts: 311

H. Lindberg
Ever wanted to build a positioning
encoder? Here’s one and you do not
even need any sensors. The circuit
uses an LED as a light emitter and
another LED as a light receiver. This is
possible due to the ability of the LED to
generate a very tiny current when light
is shining into it, almost like a small
solar panel. A red LED is used because
tests indicated that they gave the best
results. It is possible though to use a
different colour than red and the best
combination might be found by trial
and error. Please note that not all red
LEDs give the same result, so you
might have to get hold

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