Ranging sensor advice wanted

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Ranging sensor advice wanted

Post by mantrid » Wed Jan 30, 2013 8:38 pm

Post by mantrid
Wed Jan 30, 2013 8:38 pm

Hi

I'm looking for a physically small ranging sensor that can range up to
about 10ft (about 3 meters) from around 3 inches in.
It doesnt need to be very accurate - small size is more important.

Does anyone have any guidance they could offer?

I have looked at ultrasonic - they tend to be short range and rather bulky
And Laser solutions - tend to have safety issues but I'm not too sure
about those

I was wondering if it was possible to increase ultra-sonic range by somehow focusing the beam and using a single device transducer for tx and rx

Any technology that is reliable, safe to use - reasonably low cost and small
is of interest.

Any suggestions welcome.

TIA

M.
Hi

I'm looking for a physically small ranging sensor that can range up to
about 10ft (about 3 meters) from around 3 inches in.
It doesnt need to be very accurate - small size is more important.

Does anyone have any guidance they could offer?

I have looked at ultrasonic - they tend to be short range and rather bulky
And Laser solutions - tend to have safety issues but I'm not too sure
about those

I was wondering if it was possible to increase ultra-sonic range by somehow focusing the beam and using a single device transducer for tx and rx

Any technology that is reliable, safe to use - reasonably low cost and small
is of interest.

Any suggestions welcome.

TIA

M.
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Post by limor » Thu Jan 31, 2013 11:21 pm

Post by limor
Thu Jan 31, 2013 11:21 pm

you mention laser and ultrasonic in one sentence.
one costs 10$ the other 2000$
what's your budget and application?
single sensor for 3 inch to 10 feet is challenging.
you mention laser and ultrasonic in one sentence.
one costs 10$ the other 2000$
what's your budget and application?
single sensor for 3 inch to 10 feet is challenging.
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Post by mantrid » Fri Feb 01, 2013 12:47 pm

Post by mantrid
Fri Feb 01, 2013 12:47 pm

Hello limor

I think your pricing is quite a bit skewed there...
Although you can spend that much on laser devices if you buy
industrial commercial modules. Others are available that can be
modulated. I did look before coming here.

I know its challenging thats why I'm asking for help.
The application doesn't matter. The problem I have is how best
to approach the ranging issue in a cost effective manner.
Hello limor

I think your pricing is quite a bit skewed there...
Although you can spend that much on laser devices if you buy
industrial commercial modules. Others are available that can be
modulated. I did look before coming here.

I know its challenging thats why I'm asking for help.
The application doesn't matter. The problem I have is how best
to approach the ranging issue in a cost effective manner.
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Post by limor » Sat Feb 02, 2013 1:06 pm

Post by limor
Sat Feb 02, 2013 1:06 pm

I would use two sensors one for short range with ultrasound and one for long range maybe with lasers (geometric tricks like NEATO not time-of-flight).

I haven't seen much on DIY LIDAR. There's this component http://www.eodevices.com/main_eodmain_frameset.htm
but once you add the optics you don't really save much compared to HOKUYO

Can you share what you found?
I would use two sensors one for short range with ultrasound and one for long range maybe with lasers (geometric tricks like NEATO not time-of-flight).

I haven't seen much on DIY LIDAR. There's this component http://www.eodevices.com/main_eodmain_frameset.htm
but once you add the optics you don't really save much compared to HOKUYO

Can you share what you found?
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Post by limor » Sat Feb 02, 2013 7:35 pm

Post by limor
Sat Feb 02, 2013 7:35 pm

Maybe you mean this http://www.parallax.com/StoreSearchResu ... fault.aspx
?

It is a geometry triangulation solution. no modulation or time of flight..
Maybe you mean this http://www.parallax.com/StoreSearchResu ... fault.aspx
?

It is a geometry triangulation solution. no modulation or time of flight..
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Post by mantrid » Mon Feb 04, 2013 2:05 pm

Post by mantrid
Mon Feb 04, 2013 2:05 pm

Thanks for the links - they look well worth checking out.
I've also discovered some ultrasonic transducers that I may be
able to drive to do the job. Or part of it. 10ft appears to be a max for those so I'm guessing they would only work under ideal conditions. (no good to me)
Sure I'll share anything specific I get to test.
Thanks for the links - they look well worth checking out.
I've also discovered some ultrasonic transducers that I may be
able to drive to do the job. Or part of it. 10ft appears to be a max for those so I'm guessing they would only work under ideal conditions. (no good to me)
Sure I'll share anything specific I get to test.
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Post by voodoochile » Wed Mar 20, 2013 3:00 am

Post by voodoochile
Wed Mar 20, 2013 3:00 am

Check out sharp 2D120x. Cheap to buy & amazing! These are ir range finders. Check out my youtube link. I use 4 of these sensors on my Irowe 4550 robot.

http://www.youtube.com/watch?v=N7GJsiNy5iM
Check out sharp 2D120x. Cheap to buy & amazing! These are ir range finders. Check out my youtube link. I use 4 of these sensors on my Irowe 4550 robot.

http://www.youtube.com/watch?v=N7GJsiNy5iM
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Post by voodoochile » Wed Mar 20, 2013 3:00 am

Post by voodoochile
Wed Mar 20, 2013 3:00 am

Check out sharp 2D120x. Cheap to buy & amazing! These are ir range finders. Check out my youtube link. I use 4 of these sensors on my Irowe 4550 robot.

http://www.youtube.com/watch?v=N7GJsiNy5iM
Check out sharp 2D120x. Cheap to buy & amazing! These are ir range finders. Check out my youtube link. I use 4 of these sensors on my Irowe 4550 robot.

http://www.youtube.com/watch?v=N7GJsiNy5iM
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Post by mantrid » Thu Mar 21, 2013 5:53 pm

Post by mantrid
Thu Mar 21, 2013 5:53 pm

voodoochile wrote:Check out sharp 2D120x. Cheap to buy & amazing!


Thanks voodoochile.
I did look at the longer range one (The one you quote only goes up to 30cm) but they don't seem accurate enough or with quite the range I need

The one I looked at http://www.phidgets.com/products.php?ca ... _id=3522_0 would have been very close on acceptable
range but IR is just too unreliable for me in varied settings and the reliability would be aggrovated by working close to max range all the time.

Otherwise a very useful sensor though.
voodoochile wrote:Check out sharp 2D120x. Cheap to buy & amazing!


Thanks voodoochile.
I did look at the longer range one (The one you quote only goes up to 30cm) but they don't seem accurate enough or with quite the range I need

The one I looked at http://www.phidgets.com/products.php?ca ... _id=3522_0 would have been very close on acceptable
range but IR is just too unreliable for me in varied settings and the reliability would be aggrovated by working close to max range all the time.

Otherwise a very useful sensor though.
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