[Cyborg] rumble vest

Nick Burrows shamrockman at shamrockman.net
Wed Mar 31 22:32:51 UTC 2010

Those look like standard IR rangefinders rather than ultrasonic.  The small
beam width of a IR rangefinder makes it so you can generally get away with
closely packed sensors without needing any fancy tricks. The white LEDs look
like they are there to help with the minimum range issue that IR
rangefinders have

If they were ultrasonic, they would be stepping on each other, and echos and
other artifacts are more prevalent. Also ultrasonic equipment tends to be
bulkier than equivalent IR gear.

On Wed, Mar 31, 2010 at 2:40 PM, Eric Boyd <mrericboyd at yahoo.com> wrote:

> I studied the video of those 'crazy laser sensors' and I'm not convinced
> they are laser sensors.  I have attached a screenshot from a still of the
> video, I think it clearly shows something that could be an ultrasonic ranger
> with an LED in the middle.
> Also, the video clearly shows that the range is quite limited - appears to
> be between 1 and 2 feet.  This is entirely consistent with Rachel's
> experience (ultrasonic rangers useless beyond 3 feet), and really limits the
> usefulness of the device to indoor spaces only.
> Still, I'd LOVE to try that headband on, it looks quite intuitive and fun!
> Eric
> --- On *Wed, 3/31/10, Adam Skory <askory at gmail.com>* wrote:
> From: Adam Skory <askory at gmail.com>
> Subject: Re: [Cyborg] rumble vest
> To: "Eric Boyd" <mrericboyd at yahoo.com>
> Cc: cyborg at lists.noisebridge.net
> Date: Wednesday, March 31, 2010, 1:43 PM
> > On Wed, Mar 31, 2010 at 1:36 PM, Eric Boyd <mrericboyd at yahoo.com<http://mc/compose?to=mrericboyd@yahoo.com>
> > wrote:
> >
> http://blog.makezine.com/archive/2010/03/tactile_gaming_vest_lets_you_feel_t.html<http://blog.makezine.com/archive/2010/03/tactile_gaming_vest_lets_you_feel_t.html>
> A couple links beyond that article:
> http://www.k2.t.u-tokyo.ac.jp/perception/HapticRadar/index-e.html
> "We are developing a wearable and modular device allowing users to perceive
> and respond to spatial information using haptic cues in an intuitive and
> unobtrusive way. The system is composed of an array of "*optical-hair
> modules*", each of which senses range information and transduces it as an
> appropriate vibro-tactile cue on the skin directly beneath it."
> Basically Eyes in the Back of the Back, but each sensor/display pair is
> independent it seems. What I really want to know is what these crazy laser
> sensors they're using are and how much (...which is probably there
> somewhere, but I haven't delved deep into it yet...) since we had some much
> trouble with ultra-sound.
> -Skory
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