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nvp
Joined: 16 Sep 2003
Posts: 76
Location: EARTH
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 30 Sep 2003 9:44 pir motion detector epe |
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Does anyone has idea about How Motion Detector Works..
Also any material or good site...welcome...
Regards
NVP
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artem
Joined: 22 May 2003
Posts: 1652
Helped: 91
Location: Turan
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30 Sep 2003 10:48 pir detector comparator circuit |
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Popular one implemented by means of heat detector sensor (I do not know how it is exactly called in english) with mirros reflecting heat to it The mirros define sensor detection area and direction . When moving subject crossses particular mirror area , the heat sensor output value will be changed ,and this will be detected by comparator circuit .
But there are another types , which based on induction parameters change , optical radar based ,
ultrasound radar based (but these are not so popular)...
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Google
AdSense
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30 Sep 2003 10:48 Ads |
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yev15
Joined: 22 Mar 2002
Posts: 49
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30 Sep 2003 11:58 Re: Motion Detector!!! |
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| Artem is talking about an Active IR sensor. Search for "Active Infra Red Sensor" in Google, and You will find a lot of materials.
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xirix
Joined: 26 Jun 2001
Posts: 156
Helped: 1
Location: Romania
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30 Sep 2003 13:21 Re: Motion Detector!!! |
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| See Murata pyroelectric infrared sensors.
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SphinX
Joined: 25 Jan 2002
Posts: 1069
Helped: 28
Location: EGYPT
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30 Sep 2003 13:31 Re: Motion Detector!!! |
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Hi,
There is an article in EPE Mag about "Super motion detector" with schemtices + pcb
PM me if you need it.
Bye
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msdnge
Joined: 12 Dec 2001
Posts: 26
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01 Oct 2003 6:04 Re: Motion Detector!!! |
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| I need it . Please contact me @ leontsimus(at)yahoo.com . Thank you so much.
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nvp
Joined: 16 Sep 2003
Posts: 76
Location: EARTH
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01 Oct 2003 7:34 Re: Motion Detector!!! |
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Can U pls tell me the cost and availability of the same.
Regards
Poli Kitti
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nvp
Joined: 16 Sep 2003
Posts: 76
Location: EARTH
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01 Oct 2003 7:37 Re: Motion Detector!!! |
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Hello Friends
here is the Circuit and principle of motion detector
http://electronickits.com/kit/complete/surv/ak-510.pdf Also one of the good site about electronics http://electronickits.com/kit/complete/surv/
Regards
Poli Kitti
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techie
Joined: 05 Feb 2002
Posts: 850
Helped: 43
Location: Pakistan
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| 01 Oct 2003 18:38 |
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| Most motion detectors work around a PIR passive infra red detector. This sensor, coupled with a "fresnel lens" makes a simple motion detector. The fresnel lens is made out of a plastic sheet with blocks of caocave lesn like portions that impart a vairable angle sensitivity to the PIR detector. A heat source like a human being emits radiations and that radiation causes a ripple in the PIR sensor because of the fresnel lens. This ripple (AC signal) is amplified and fed to a comparator and then a timer to make a complete sensor.
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