David

http://www.suntekstore.com/goods-14001970-Wireless+Module+Doppler+Radar+Mic=
r
owave+Motion+Sensor.html

This link has some data and schematics. Look at " document download ".

Cheers

Rodolfo

-----Mensaje original-----
De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]En nombre de
Nily
Enviado el: Monday, February 20, 2012 3:05 PM
Para: Microcontroller discussion list - Public.
Asunto: RE: [EE] Proximity Sensors


Look at this item 120782820889 sold by eBay.

Says detection 20 meters...

-----Mensaje original-----
De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]En nombre de
David Duffy (AVD)
Enviado el: Monday, February 20, 2012 2:42 PM
Para: PicList
Asunto: [EE] Proximity Sensors


Has anyone here done much work with proximity sensors?  I am looking to
trigger an event when someone stands in front of (or walks past) a
specific area in a retail environment.  The sensing must be done from
one side only (no beam break methods).

The sensing range would need to be approx 200mm - 1000mm (8" - 40").
The horizontal detection width would need to be approx 500mm (20") at
end of the range I guess.  There would be multiple sensors, spaced at
approx 600mm - 900mm (24" - 36") intervals.

There is nowhere to mount the sensors apart from near the floor or
*maybe* on the wall higher up.  Ideally the sensors need to stand up to
a bit of abuse from knocks and maybe a splash from a cleaners mop.

Typical machinery proximity sensors would be easy to mount, but seem to
be mostly very short range.  Ambient light can change somewhat so shadow
detection would not be suitable I suspect.

I had thought about ultrasonic "range finders" (as used in robotics) but
they would probably interact when use this close together.  They also
wouldn't stand up to the abuse they'd cop being mounted down low.

I think typical PIRs are going to be too coarse, but maybe there are
better ones than what I've seen so far?
David...

--
___________________________________________
David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: www.audiovisualdevices.com.au
___________________________________________

--
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.1913 / Virus Database: 2113/4821 - Release Date: 02/20/12

--
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.1913 / Virus Database: 2113/4821 - Release Date: 02/20/12

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.