A PIC can measure the time an ultrasonic pulse takes to travel.  That is
how the tapeless tapemeasures work.  Infrared travels too fast for a PIC
to measure.  You would need some external hardware to measure anything
less than a mile.

Sherpa Doug

> -----Original Message-----
> From: angus morrison [mailto:angus@ANGSTROM.UK.COM]
> Sent: Thursday, March 28, 2002 1:12 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: Measurment of distance via infrared?
>
>
> I need tt measure distance somehow - i.e. whether there is an
> object in
> front of a sensor or not... is it possible to use a PIC to
> measure a very
> rough calculation of reflection distance, - you know the same
> way one of
> those tapeless tape measures work?
>
> anyone any experience/ideas?
>
> angus.
>
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>
>

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