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<?xml-stylesheet type="text/xsl" href="https://community.arm.com/utility/feedstylesheets/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>motion  sensors</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/39287/motion-sensors</link><description> 
i want to do room security system,in that i want detect the person
or anything entered in the room not only from door from any side of
the room,so plz suggest me which sensors i have to use for this 

 
Thanking you, 
Mujeeb 
 </description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: motion  sensors</title><link>https://community.arm.com/thread/142896?ContentTypeID=1</link><pubDate>Mon, 23 May 2011 04:47:00 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:55ed3760-a368-4a87-93e1-9d0d6b106c58</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;a href="http://securitysolutions.com/mag/security_pros_cons_volumetric/"&gt;securitysolutions.com/.../&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;
There are hundreds of other magazines and thousands of other
websites related to this topic - you have plenty of material to work
on!&lt;/p&gt;

&lt;p&gt;
It&amp;#39;s not like this is some new or obscure field!&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: motion  sensors</title><link>https://community.arm.com/thread/139919?ContentTypeID=1</link><pubDate>Mon, 23 May 2011 04:14:40 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:20da2ea9-ff66-44a5-951c-7e7c45a45a3f</guid><dc:creator>Per Westermark</dc:creator><description>&lt;p&gt;&lt;p&gt;
Heat-based sensors are cheap and works reasonably well but can be
fooled, as you see in MI films. If they don&amp;#39;t see a temperature
variation moving between the facettes of the sensor, it will not
generate any alarm.&lt;/p&gt;

&lt;p&gt;
How about a laser scanner? Either having a large number of mirrors
and have the ray bounce around before reaching a detector. Or use
galvanometers and sweep the ray around the room and detect the
expected intersection points. See LADAR or LIDAR.&lt;/p&gt;

&lt;p&gt;
Or go for a web cam and analyze the image - a number of web cams
or graphics cards comes with software for that kind of image
processing, sending emails or similar in case they detect a
change.&lt;/p&gt;

&lt;p&gt;
Use a three-dimensional microphone setup and listen for sound.
With volume processing you can figure out if the sound is comming
from inside the room or if it is just outside noise.&lt;/p&gt;

&lt;p&gt;
Or maybe go for ultrasonic range finding - an arrayed sonar with
multiple sound emission points to avoid dead zones.&lt;/p&gt;

&lt;p&gt;
Maybe pressure sensors in the floor?&lt;/p&gt;

&lt;p&gt;
Or if the room isn&amp;#39;t too large (or if you place the sensoring
system in floor or roof) you could go for a capacitive system,
reacting to the water in our bodies.&lt;/p&gt;

&lt;p&gt;
Sensors analyzing the variation in CO2 in the room.&lt;/p&gt;

&lt;p&gt;
Options, options. Lots of physical properties can be used to
create an alarm. It&amp;#39;s just a question of allowed cost. Allowed size.
Allowed sensitivity. Allowed probability of false alarms. Allowed
visibility.&lt;/p&gt;

&lt;p&gt;
In the end, you can&amp;#39;t really have any problem finding a possible
solution. Then it&amp;#39;s just standard work, figuring out what hardware +
software that would be needed to implement the solution. So it falls
back to you. What problem do you want to solve. What resources do you
have. What have you done. What problems have you seen.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: motion  sensors</title><link>https://community.arm.com/thread/136492?ContentTypeID=1</link><pubDate>Mon, 23 May 2011 03:44:47 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:839873f3-2db3-4693-a81b-ba86d8445d67</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;i&gt;&amp;quot;then you&amp;#39;ll be able to detect ram raiders knocking down the
walls&amp;quot;&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
What about attacks through the ceiling?&lt;/p&gt;

&lt;p&gt;
Or tunnelling up through the floor?&lt;/p&gt;

&lt;p&gt;
&lt;i&gt;&amp;quot;subspace sensors might be useful&amp;quot;&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
Maybe also an infinite improbability detector - for people
appearing for unlikely reasons...?&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: motion  sensors</title><link>https://community.arm.com/thread/133913?ContentTypeID=1</link><pubDate>Mon, 23 May 2011 03:28:48 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:42ab8549-9f22-4223-8aa6-46f002a313ef</guid><dc:creator>blah blah</dc:creator><description>&lt;p&gt;&lt;p&gt;
you need a microswitch against each wall.&lt;br /&gt;
then you&amp;#39;ll be able to detect ram raiders knocking down the
walls.&lt;/p&gt;

&lt;p&gt;
subspace sensors might be useful.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: motion  sensors</title><link>https://community.arm.com/thread/116384?ContentTypeID=1</link><pubDate>Mon, 23 May 2011 03:05:33 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:0dfe11b6-d727-4839-a97e-463466656ee2</guid><dc:creator>Mujeeb Shaik</dc:creator><description>&lt;p&gt;&lt;p&gt;
i have gone through Pyroelectric Infrared Sensor IRA-E940ST1
Series but i am not getting up to how much range it will sense and is
it accurate or not ,better than this any sensor is there please
suggest me....&lt;/p&gt;

&lt;p&gt;
Thanking you,&lt;br /&gt;
Mujeeb&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: motion  sensors</title><link>https://community.arm.com/thread/104880?ContentTypeID=1</link><pubDate>Mon, 23 May 2011 01:03:21 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:31903e78-92bd-4402-9e7b-9210c5245920</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;p&gt;
You said that &lt;b&gt;you&lt;/b&gt; want to do this project; so, again:&lt;/p&gt;

&lt;p&gt;
What research &amp;amp; study have &lt;i&gt;&lt;b&gt;you&lt;/b&gt;&lt;/i&gt; done to find out
what kind(s) of sensors are usually used by this kind of system?&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: motion  sensors</title><link>https://community.arm.com/thread/79313?ContentTypeID=1</link><pubDate>Mon, 23 May 2011 00:29:41 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:73aca556-115a-4448-9918-79c22cef9ca9</guid><dc:creator>Mujeeb Shaik</dc:creator><description>&lt;p&gt;&lt;p&gt;
i want to use motion sensors to find the entrance of person or any
other moving things entered in to room from any side of the room not
only from entrance door of room&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: motion  sensors</title><link>https://community.arm.com/thread/66613?ContentTypeID=1</link><pubDate>Mon, 23 May 2011 00:26:07 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:051bf68e-9b68-4b7f-8ea0-1cf8ef860b49</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;p&gt;
What research &amp;amp; study have &lt;b&gt;you&lt;/b&gt; done to find out what
kind(s) of sensors are usually used by this kind of system?&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>