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josquill
Joined: 28 Dec 2001
Posts: 23
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 22 Apr 2003 4:27 Need sensor of Movement |
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Hi
I need any circuit for "sensor of movement"
tnks.
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techie
Joined: 05 Feb 2002
Posts: 834
Helped: 42
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| 22 Apr 2003 5:06 |
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1. Movement (shock). You can use a piezo buzzer as a sensor. You can even use a mecahnical relay to sense some amount of shock. Or you could use an accelerometer if you want to spend money.
2. Movement (displacement). LVDT, linear encoders, reisitance sliders.
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sugm
Joined: 11 Dec 2001
Posts: 61
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| 22 Apr 2003 5:36 |
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| RF doppler sensor can do it
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ab2k2
Joined: 03 Jan 2002
Posts: 2
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| 29 Apr 2003 2:01 |
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| May I know which brand and model of RF doppler sensor is cheapest?
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mr_ghz
Joined: 01 Apr 2002
Posts: 294
Helped: 2
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| 06 May 2003 20:58 |
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The problem of such sensor are that they are mostly fabricated for OEM's.
So there is nearly no chance to get a single one.
One possibility is to get a door-opener and to reuse it's doppler-module
(most a gunn-source with demodulator). Most of them are working on
the K-Band (24GHz), but there also exist (bigger ones) at X-Band (10GHz)
Perhaps you will find on the internet something if you search with terms
like 'gunn source', 'doppler module' or 'movement sensor'
Greets
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proton
Joined: 31 May 2001
Posts: 78
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| 06 May 2003 21:47 |
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search for an old microwave anti-theves device. It works in the 10ghz band tipycally.
proton
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