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'[EE]: Measurment of distance via infrared?'
2002\03\28@130447 by angus morrison

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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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2002\03\28@131110 by Douglas Butler

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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 removed}

2002\03\28@132616 by H. Carl Ott

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Angus

There are a few approaches:
Here are just a couple of leads:

1. An off the shelf solution with analog output:
www.acroname.com/robotics/parts/R21-IR05.html:
Sharp, makes the sensor Acroname is just one outfit that sells it.

2. Hacking a 'standard' ir receiver module to measure distance:
http://www.mil.ufl.edu/imdl/handouts/sharphack.pdf


Hope that helps.

carl

At 06:11 PM 3/28/2002, you wrote:
{Quote hidden}

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2002\03\28@193534 by michael brown

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> 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,

How far of a distance.  Sharp makes infrared range finding modules.
http://philohome.free.fr/sensors/gp2d12.htm  10 - 80 cm

michael brown

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'[EE]: Measurment of distance via infrared?'
2002\04\02@033424 by Archmage
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Hey I saw the message about the sharp IR modules
does any one know who sell them in Canada individually
Future sells them in units of 100
I only need 2

thanks

Paul R

{Original Message removed}

2002\04\02@120227 by Dave Mumert

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Hi Paul

Active had them in stock in Calgary.  There are 4 models $12-$18.  They are
a bagged product so should be available at any Active store.

Dave

> Hey I saw the message about the sharp IR modules
> does any one know who sell them in Canada individually
> Future sells them in units of 100
> I only need 2

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2002\04\02@125957 by Herbert Graf

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Saw a couple on the shelf at Active in Toronto... TTYL

{Quote hidden}

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