Cycling 74 » Topic: Ultrasonic Sensors http://cycling74.com/forums/topic/ultrasonic-sensors/feed Tue, 18 Jun 2013 20:35:10 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/ultrasonic-sensors/#post-41037 <![CDATA[Ultrasonic Sensors]]> http://cycling74.com/forums/topic/ultrasonic-sensors/#post-41037 Tue, 25 Nov 2008 06:19:34 +0000 blf05@fsu.edu 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!

]]> http://cycling74.com/forums/topic/ultrasonic-sensors/#post-145742 <![CDATA[Re: Ultrasonic Sensors]]> http://cycling74.com/forums/topic/ultrasonic-sensors/#post-145742 Tue, 25 Nov 2008 13:09:26 +0000 ico 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!

]]> http://cycling74.com/forums/topic/ultrasonic-sensors/#post-145743 <![CDATA[Re: Ultrasonic Sensors]]> http://cycling74.com/forums/topic/ultrasonic-sensors/#post-145743 Tue, 25 Nov 2008 20:24:27 +0000 Roald Baudoux

]]> http://cycling74.com/forums/topic/ultrasonic-sensors/#post-145744 <![CDATA[Re: Ultrasonic Sensors]]> http://cycling74.com/forums/topic/ultrasonic-sensors/#post-145744 Mon, 01 Dec 2008 02:50:49 +0000 blf05@fsu.edu 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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