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Posted by kartoun on January 20, 2008, 10:15 am
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Hi,
I'm looking for an accurate distance sensor (I guess that a sonar will
be the best).
The sensor I'm looking for should be interfaced easily with a PC
(RS-232, USB).
Thanks!
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Posted by Deep Reset on January 20, 2008, 11:15 am
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> Hi,
>
> I'm looking for an accurate distance sensor (I guess that a sonar will
> be the best).
>
> The sensor I'm looking for should be interfaced easily with a PC
> (RS-232, USB).
>
> Thanks!
"Best" depends on a whole number of factors - range, update rate,
accuracy...
Sonar doesn't work too well in noisy environments and may not work too well
at extremely close range..
Deep
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Posted by D Herring on January 20, 2008, 12:59 pm
Please log in for more thread options kartoun wrote:
> Hi,
>
> I'm looking for an accurate distance sensor (I guess that a sonar will
> be the best).
>
> The sensor I'm looking for should be interfaced easily with a PC
> (RS-232, USB).
You're asking for two things in one package:
- a distance/range sensor
- a communications link
As for distance/range, check out both ultrasound (sonar) and the Sharp
GDP2Dx (e.g. GDP2D12) infrared sensors.
Ultrasound:
- greater distances
- larger sensing "cone"
IR:
- higher refresh rates
- generally cheaper & easier to use
- often less noisy
- suffer less crosstalk between multiple sensors
Both technologies can suffer from unusually absorptive or reflective
materials.
As for communications, many cheap micros will do. PIC, basic stamp,
MSP430, ARM, Arduino, ... Here, its generally best to find something
with a supportive community. RS232 is generally easier to program
than USB, though a few good USB chipsets have come out in the recent
years.
- Daniel
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Posted by kartoun on January 20, 2008, 3:45 pm
Please log in for more thread options > kartounwrote:
> > Hi,
>
> > I'm looking for an accurate distance sensor (I guess that a sonar will
> > be the best).
>
> > The sensor I'm looking for should be interfaced easily with a PC
> > (RS-232, USB).
>
> You're asking for two things in one package:
> - a distance/range sensor
> - a communications link
>
> As for distance/range, check out both ultrasound (sonar) and the Sharp
> GDP2Dx (e.g. GDP2D12) infrared sensors.
> Ultrasound:
> - greater distances
> - larger sensing "cone"
> IR:
> - higher refresh rates
> - generally cheaper & easier to use
> - often less noisy
> - suffer less crosstalk between multiple sensors
>
> Both technologies can suffer from unusually absorptive or reflective
> materials.
>
> As for communications, many cheap micros will do. =A0PIC, basic stamp,
> MSP430, ARM, Arduino, ... =A0Here, its generally best to find something
> with a supportive community. =A0RS232 is generally easier to program
> than USB, though a few good USB chipsets have come out in the recent
> years.
>
> - Daniel
Thanks for your answer.
Perhaps do you know what sonar sensors are installed on the PatrolBot?
They look bigger than the $25-$40 sonar sensors exist on the market.
http://img.linuxexpres.cz/2005/6/roboti/patrolbot.jpg
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Posted by D Herring on January 20, 2008, 5:31 pm
Please log in for more thread options kartoun wrote:
> Perhaps do you know what sonar sensors are installed on the PatrolBot?
> They look bigger than the $25-$40 sonar sensors exist on the market.
> http://img.linuxexpres.cz/2005/6/roboti/patrolbot.jpg
Those look a lot like the classic Polaroid transducers.
For example, see
http://www.acroname.com/robotics/parts/R13-INST.html
- Daniel
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>
> I'm looking for an accurate distance sensor (I guess that a sonar will
> be the best).
>
> The sensor I'm looking for should be interfaced easily with a PC
> (RS-232, USB).
>
> Thanks!