Author Topic: Accurate distance measuring sensors?  (Read 2305 times)

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Offline amadcowTopic starter

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Accurate distance measuring sensors?
« on: September 29, 2008, 08:53:52 AM »
Are there any accurate distance measuring sensors available?  I need the precision to be at least .5".  Right now, there aren't any other requirements besides the precision.  I'm just looking for recommendations.

Offline ArcMan

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Re: Accurate distance measuring sensors?
« Reply #1 on: September 29, 2008, 09:20:20 AM »
The Sharp GP2Y0A21YK may meet your needs, but that depends on what distance away from the object your sensor will be.  Check out the specs here:

http://www.sparkfun.com/commerce/product_info.php?products_id=242

Offline benji

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Re: Accurate distance measuring sensors?
« Reply #2 on: September 29, 2008, 10:16:26 AM »
after 1 meter you wont get that precision with the sensor Arcman mentioned ,the range is from 30 to 150 cm,,its still a great sensor,i used it for mapping
good ol' BeNNy

Offline amadcowTopic starter

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Re: Accurate distance measuring sensors?
« Reply #3 on: October 01, 2008, 07:51:21 PM »
Thanks for the suggestions.
How sensitive are those sensors to texture, color and material of the reflecting object?

Are there any other sensors available?  I'm trying to compile a list of possible options.

Offline dsheller

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Re: Accurate distance measuring sensors?
« Reply #4 on: October 02, 2008, 11:24:26 AM »
There is a ultrasonic sensor made by parallax that is pretty precise, to increase precision though you should probably know what temperature it is in the operating environment and code for that accordingly.

Offline pomprocker

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Re: Accurate distance measuring sensors?
« Reply #5 on: October 02, 2008, 03:44:52 PM »
There is a ultrasonic sensor made by parallax that is pretty precise, to increase precision though you should probably know what temperature it is in the operating environment and code for that accordingly.



You would also want to use a higher resolution timer for the parallax ping. Maybe also hook it up to the capture pin on an atmega

Offline amadcowTopic starter

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Re: Accurate distance measuring sensors?
« Reply #6 on: October 02, 2008, 10:57:23 PM »
Thanks for the suggestions everyone.  I was curious of how the resolution of sonar was when sensing objects ~1m away.  Could it be used to map a thin pole that was an inch or so in diameter?

Offline Admin

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Re: Accurate distance measuring sensors?
« Reply #7 on: October 08, 2008, 05:52:20 AM »
Quote
I was curious of how the resolution of sonar was when sensing objects ~1m away.  Could it be used to map a thin pole that was an inch or so in diameter?
Short answer, yes.

Check the sonar datasheets, it will/should tell you.

 


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