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'[OT] people detector, cheap, low consume, and esay'
2000\03\30@214733 by Mauricio Jancic

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Hi people,
       I'm looking for some ideas on how to make a "people detector". The idea is to make a device that plays a pre-recorded voice message (ISD14000 series) each time someone is in front (or near) it.
       At the first time, I was thinking on a Datalogic infrared sensor (abou U$S 120 + 21% (taxes) here in Argentina). But there were two problems: 1st.  The high price in relation to the rest of the circuit.                                    
                                               2nd. As it must be battery powered i make some calc on the total consume and it was too much for me. According to specifications the sensor consumes 25 to 30 mA (the same that the isd when playing) and that get's me to a 2.5 weeks with a 12Ah and 12 v battery.
                                               
                                               3rd. It isn't very nice to put such device on this simple circuit.

       So, wath im looking for is some bright and ease to build ideas on infrared or ultrasound "spectrum".
       Do you have any??

       Thank in advance, Mauricio.

2000\03\30@215827 by Andrew Hooper

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How about using a Heat Detector.?

I have a circut floating around that was designed for animals, it detects
not
only the heat when an animal walks past but also detects the direction the
animal was going.

An IR or RF proximity sensor could also work.

Regards
Andrw
{Original Message removed}

2000\03\30@221045 by Dale Botkin

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Mauricio,

I saw something that might be just the thing you need.  A single 555
timer, two resistors, pretty much nothing else.  I don't know how far off
it could detect a person, but check it out:

http://www.rdrop.com/~marvin/  (the PARTS home page); click the "Projects"
link and look all the way at the bottom.  The circuit was originally in a
stud sensor for finding objects in walls, the page there shows it in use
as an object sensor for a robot.

I plan to build one next week.  I want to mount it along with a PIC and an
LCD display to make a cubicle-wall-mounted BS meter to hang underneath my
nameplate at work!  <grin>

Dale


On Thu, 30 Mar 2000, Mauricio Jancic wrote:

{Quote hidden}

---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov

2000\03\31@004427 by David Huisman

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Hi,
I have designed a very low cost movement detector (appears in RF Design
magazine 1986). It works at 1.5Ghz, is simple to build and can go directly
to PIC AD ip

2000\03\31@010826 by David VanHorn

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

At 02:30 PM 3/31/00 +1000, David Huisman wrote:
>Hi,
>I have designed a very low cost movement detector (appears in RF Design
>magazine 1986). It works at 1.5Ghz, is simple to build and can go directly
>to PIC AD ip


Is this webbed somewhere?

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Version: PGPfreeware 6.5.2 for non-commercial use <http://www.pgp.com>

iQA/AwUBOORoZoFlGDz1l6VWEQLfpQCffoDERtD1qSRAt/1h+ev+zaubxbwAoKDB
44oXKQI4sL4zbAaTahTWVHD/
=Wnfj
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2000\03\31@033023 by Dr. Imre Bartfai

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Hi,
here in Hungary you can get a lot of ready-made IR burglar sensor for
about $20, off-the-self. Why reinvent the wheel?

Regards,
Imre


On Thu, 30 Mar 2000, Mauricio Jancic wrote:

{Quote hidden}

2000\03\31@034515 by Alan B Pearce

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How about a CCTV camera. You could probably use a slow scan rate so your
hardware does not need to be blindingly fast to deal with video rates, and store
the background image of the unoccupied area. then detect when the image changes
from the stored background image. With luck you could probably use one camera to
detect several positions - e.g. people in front of show cases, or whatever you
had in mind.

2000\03\31@070916 by paulb

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Dale Botkin wrote:

> http://www.rdrop.com/~marvin/  (the PARTS home page);

 OK, power on pins 8 and 16.  Is that by any chance a Z8?
--
 Cheers,
       Paul B.

2000\03\31@071318 by Andrew Kunz

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If you figure it out, Vista Research near SF, CA would like to know about it.
What they have now is expensive, expensive, expensive, and difficult.

http://www.vrinc.com

Andy











Alan B Pearce <spam_OUTA.B.PearceTakeThisOuTspamRL.AC.UK> on 03/31/2000 03:42:51 AM

Please respond to pic microcontroller discussion list <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>








To:      PICLISTspamKILLspamMITVMA.MIT.EDU

cc:      (bcc: Andrew Kunz/TDI_NOTES)



Subject: Re: [OT] people detector, cheap, low consume, and
         esay to build,              is that too much?








How about a CCTV camera. You could probably use a slow scan rate so your
hardware does not need to be blindingly fast to deal with video rates, and store
the background image of the unoccupied area. then detect when the image changes
from the stored background image. With luck you could probably use one camera to
detect several positions - e.g. people in front of show cases, or whatever you
had in mind.

2000\03\31@102147 by jamesnewton

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see:
http://techref.massmind.org/io/sensor/meat

(you know, people are mostly meat...)

---
James Newton .....jamesnewtonKILLspamspam.....geocities.com 1-619-652-0593
http://techref.massmind.org NEW! FINALLY A REAL NAME!
Members can add private/public comments/pages ($0 TANSTAAFL web hosting)


{Original Message removed}

2000\03\31@124605 by Scott Dattalo

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On Fri, 31 Mar 2000, James Newton wrote:

> see:
> http://techref.massmind.org/io/sensor/meat


Also, checkout this:

http://www.4qd.co.uk/ccts/pdet.html

(I haven't built it)

Scott

2000\03\31@195509 by Dale Botkin

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8 and 16?  I only see two 8-pin packages...  one's a 555, the other is +
on 1, - on 8, looks like a 12c508 or something.

Dale

On Fri, 31 Mar 2000, Paul B. Webster VK2BZC wrote:

> Dale Botkin wrote:
>
> > http://www.rdrop.com/~marvin/  (the PARTS home page);
>
>   OK, power on pins 8 and 16.  Is that by any chance a Z8?
> --
>   Cheers,
>         Paul B.
>

---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov


'[OT] people detector, cheap, low consume, and esay'
2000\04\01@064627 by paulb
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Dale Botkin wrote:

> 8 and 16?  I only see two 8-pin packages...  one's a 555, the other is
> + on 1, - on 8, looks like a 12c508 or something.

 OK, I was looking at http://www.rdrop.com/~marvin/parts/issue14.pdf .
At what were you looking?
--
 Cheers,
       Paul B.

2000\04\01@114500 by Dale Botkin

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On Sat, 1 Apr 2000, Paul B. Webster VK2BZC wrote:

> Dale Botkin wrote:
>
> > 8 and 16?  I only see two 8-pin packages...  one's a 555, the other is
> > + on 1, - on 8, looks like a 12c508 or something.
>
>   OK, I was looking at http://www.rdrop.com/~marvin/parts/issue14.pdf .
> At what were you looking?
> --
>   Cheers,
>         Paul B.
>

The link for the page itself is
http://www.rdrop.com/~marvin/other/otherprj.htm, it's all the way at the
bottom of the page.  It's another, MUCH simpler stud sensor circuit that
uses only one wire as an antenna.

Dale
---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov

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