--=======61712D8D=======
Content-Type: text/plain; x-avg-checked=avg-ok-3C0DBD4; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 8bit

I won't be able to use the line of sight triangulation method (w/ laser or
light) because the object is free moving.



At 03:09 PM 12/19/2003 +1100, Liam O'Hagan wrote:

>Make your own "GPS" system.
>
>Use a bunch of transmitters at know locations, and trianguate your
>position...
>
>Transmitters can be something like visible light or laser
>
> > -----Original Message-----
> > From: James Tu [SMTP:james@2-BIT-TOYS.COM]
> > Sent: Friday, December 19, 2003 5:43 PM
> > To:   PICLIST@MITVMA.MIT.EDU
> > Subject:      Re: [EE:] Wireless and location sensing
> >
> > The ultrasonic rangefinder is cool.  I was hoping for something that would
> > tell me "who" and "how far."
> >
> > Is there anything besides GPS that will do that?   My application won't be
> > able to use GPS because it will be indoors.
> >
> >
> > At 10:02 PM 12/18/2003 -0500, you wrote:
> >
> > >Some ultrasonic ideas here:
> > >
> > >http://www.ottawarobotics.org/articles/ultrasonic/ultrasonic.html
> > >
> > >DOC
> > >
> > >http://www.robot-one.ca
> > >
> > >
> > >
> > >
> > >At 08:46 PM 12/18/2003 -0800, you wrote:
> > >>Trying to do research on the following and thought I post here, too.
> > >>
> > >>I'm creating a device that communicates wirelessly and will be aware of
> > >>other devices around it...AND it needs to know how far away the other
> > >>object is.  The distance that I'm talking about is a few feet to a few
> > >>meters.
> > >>
> > >>Ex:  The device needs to know that device A is two feet from it and that
> > >>device B is 3 meters from it.
> > >>
> > >>What's available out there?
> > >>
> > >>Thanks!
> > >>
> > >>James
> > >>
> > >>--
> > >>http://www.piclist.com hint: PICList Posts must start with ONE topic:
> > >>[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>---
> > >>Outgoing mail is certified Virus Free.
> > >>Checked by AVG anti-virus system (http://www.grisoft.com).
> > >>Version: 6.0.532 / Virus Database: 326 - Release Date: 10/27/2003
> > >>
> > >>--
> > >>http://www.piclist.com hint: PICList Posts must start with ONE topic:
> > >>[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
> > >
> > >--
> > >http://www.piclist.com hint: PICList Posts must start with ONE topic:
> > >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
> > >
> > >
> > >
> > >
> > >
> > >
> > >---
> > >Incoming mail is certified Virus Free.
> > >Checked by AVG anti-virus system (http://www.grisoft.com).
> > >Version: 6.0.532 / Virus Database: 326 - Release Date: 10/27/2003
> >
> > James Tu
> > james@2-bit-toys.com
> >
> > --
> > http://www.piclist.com hint: PICList Posts must start with ONE topic:
> > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
> >
> >
> >  << File: ATT00000.txt >>
>
>--
>http://www.piclist.com hint: PICList Posts must start with ONE topic:
>[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>
>
>
>
>---
>Incoming mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.532 / Virus Database: 326 - Release Date: 10/27/2003

James Tu
james@2-bit-toys.com

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics



--=======61712D8D=======
Content-Type: text/plain; charset=us-ascii; x-avg=cert; x-avg-checked=avg-ok-3C0DBD4
Content-Disposition: inline


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.532 / Virus Database: 326 - Release Date: 10/27/2003

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics



--=======61712D8D=======--