Possibly the Doppler radar can be restricted to a shorter range by attenuat=
ing the signal.
Perhaps a wire mesh in front of the unit.
There is also a pot that claims to adjust the range.....
gus

> On Feb 20, 2012, at 6:03 PM, David Duffy (AVD) wrote:
>=20
> Thanks for the link.  I checked them out but they have a min range of 3=20
> metres, which will cause triggering by people way outside the target rang=
e.
> David...
>=20
> On 21/02/2012 9:42 AM, Nily wrote:
>> David
>>=20
>> http://www.suntekstore.com/goods-14001970-Wireless+Module+Doppler+Radar+=
Micr
>> owave+Motion+Sensor.html
>>=20
>> This link has some data and schematics. Look at " document download ".
>>=20
>> Cheers
>>=20
>> Rodolfo
>>=20
>> -----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
>>=20
>>=20
>> Look at this item 120782820889 sold by eBay.
>>=20
>> Says detection 20 meters...
>>=20
>> -----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
>>=20
>>=20
>> 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).
>>=20
>> 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.
>>=20
>=20
> --=20
> ___________________________________________
> 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
> ___________________________________________
>=20

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