Searching \ for '[EE]: Ultrasonic detector' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=ultrasonic+detector
Search entire site for: 'Ultrasonic detector'.

Exact match. Not showing close matches.
PICList Thread
'[EE]: Ultrasonic detector'
2003\05\23@052251 by Tal

flavicon
face
Hi

Can an US detector work outdoor?
or it need a defined space like a room or in-car only?
I want to use it as a visitor signal near the house gate.

Regards

Tal

"I have not failed. I've just found 10,000 ways that won't work."
Thomas Edison

--
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

2003\05\24@050318 by Peter L. Peres

picon face
A us sender/detector pair will work anywhere but outside it is very prone
to interference. Unlike pir it will react to cats, moving grass,
newspapers carried by the wind, birds, and larger insects.

Inside they work much better because things do not move so much and they
set up a standing wave pattern whose disturbance causes the alarm. This
gives much more signal than an open field sonar or reflector type sensor
as you would use outdoors.

Imho get a pir based sensor and modify it to suit your purpose. And make
very sure the sun cannot illuminate it, no matter what the time of day.

Peter

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.

More... (looser matching)
- Last day of these posts
- In 2003 , 2004 only
- Today
- New search...