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Ultrasonic Sensors

November 25, 2008 | 6:19 am

I’m looking to use ultrasonic sensors (I think) in an upcoming dance project. My question is, has anybody worked with the Eobody system with this sensor, or a similar system? What kind of data can I expect it to return?

The obvious advantage of ultrasonic is the distance it offers, but can it even tell if there are multiple objects present, such as by intensity + distance, etc?

Has anyone tried positioning multiple ultrasonic sensors in perpendicular axes to track objects?

Thanks!



ico
November 25, 2008 | 1:09 pm

Not sure about Eobody, but FWIW we built a small imote network using
ultrasound to track position by triangulating the listener’s imote. While
thing was generally accurate it had also very slow update in part because we
were unable to change the emitting frequency which caused collisions. Other
consideration is inaccuracies introduced by body occlusion which resulted in
junk data (we filtered all incomplete updates and only accepted ones that
had all three points registered within a single update).

You can sort-of see its performance here (crappy digital camera video):
http://ico.bukvic.net/Temp/crickets.avi
(listener was in this case wired, but could be obviously wireless as well)

Best wishes,

Ico

> —–Original Message—–
> From: maxmsp-bounces@cycling74.com [mailto:maxmsp-bounces@cycling74.com]
> On Behalf Of Ben
> Sent: Tuesday, November 25, 2008 1:20 AM
> Subject: [maxmsp] Ultrasonic Sensors
>
>
> I’m looking to use ultrasonic sensors (I think) in an upcoming dance
> project. My question is, has anybody worked with the Eobody system with
> this sensor, or a similar system? What kind of data can I expect it to
> return?
>
> The obvious advantage of ultrasonic is the distance it offers, but can it
> even tell if there are multiple objects present, such as by intensity +
> distance, etc?
>
> Has anyone tried positioning multiple ultrasonic sensors in perpendicular
> axes to track objects?
>
>
> Thanks!


November 25, 2008 | 8:24 pm


December 1, 2008 | 2:50 am

Thank you everyone for your helpful input!

I think I will use a camera to track the performer in two dimensions, and use the ultrasound to find the third. Hopefully I can report back on how well it goes in the future.

-Ben


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