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'[OT] people detector, cheap, low consume,'
2000\03\30@221511 by Mark Newland

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Sounds like I may like to have this for a hobby project that I want to build.
Imagine a tripod with a motorized turret on top.  Mount on top of it a battery
operated, water type, squirt gun. Have the IR heat sensers track the little kid
walking by and use ultrasonics to detect range.  When the kid gets within
range.....ZAP!!!

Now imagine putting this directly in front of your friends front door and watch
him get into the house.

Andrew Hooper wrote:

{Quote hidden}

> {Original Message removed}

2000\03\31@022741 by D Lloyd

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Hi,

Check out this month's New Scientist (Black Holes edition); there is an article
in there about using locusts eyes for vision detection. They test the responses
by showing them clips from battle sequences from Star Wars. Probably not quite
what you had in mind [ ;-) ] but distributed computing using very simple sensors
appears to be the "in vogue" way of implementing cheap vision systems.

Dan


'[OT] people detector, cheap, low consume,'
2000\04\01@142726 by Mauricio Jancic
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Thank you for your answers, but, dont you have anything using infrared or ultrasound?
       Mauricio Jancic

-----Mensaje original-----
De:     Dale Botkin [SMTP:spam_OUTdaleTakeThisOuTspamBOTKIN.ORG]
Enviado el:     S‡bado, 01 de Abril de 2000 01:41 p.m.
Para:   .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Asunto: Re: [OT] people detector, cheap, low consume, and esay to build,is that too much?

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

{Quote hidden}

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

2000\04\01@143554 by David VanHorn

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At 04:27 PM 4/1/00 -0300, Mauricio Jancic wrote:
>Thank you for your answers, but, dont you have anything using infrared or
ultrasound?
>        Mauricio Jancic

Infrasonic works too.
Cheap. Condenser mic, filter, amplifier.
Fiddly to adjust, but reliably senses doors opening and the like.
Not "reliable", also senses wind rattles etc.
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2000\04\01@144216 by Dale Botkin

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I don't, but there are a lot of Web pages detailing how to use ultrasonic
ranging.  The IR stuff I have seen has all been for very short range
obstruction detection or monitoring a beam for intrusion sensing.

> {Original Message removed}

2000\04\01@151918 by Dave Johnson

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Dale Botkin wrote:

>The IR stuff I have seen has all been for very short range
>obstruction detection or monitoring a beam for intrusion sensing.
There are "Pyroelectric" sensors designed specifically to detect warm
bodies. Info on one particular sensor is at:

http://www.acroname.com/robotics/parts/parts.html#sns

Not particularly cheap, though...

Dave Johnson

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