Forget the PVC Pipe. It is NOT NEEDED!Originally Posted by wmerrin
Magnetometers use a "Hall Effect" Device to detect Magnetic Field Changes.
This is considerably Different from my system and not very easy to build for the average person.
Vehicle Loop Detector
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30th October 2007 06:48 AM #11wmerrin
How are the magnetometer sensors used in some vehicle detector systems constructed? An example is:
http://www.smarthome.com/7313.html
What goes in the PVC pipe?
Wally0
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30th October 2007 01:35 PM Thread Starter #12chemelec
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3rd November 2007 01:44 PM #13praveen kumar singh
ya its great!!!!!
0
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30th August 2009 07:30 AM #14yehey
Coil loop inductance
What inductance are we looking at on this coil? I am making a mini version of this. Like a few inches, somehow I cannot get it to work.
0
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30th August 2009 01:22 PM Thread Starter #15chemelec
Aproximately 18uH. Originally Posted by yehey
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All Emails to me Must Contain the Word \"Electronic\" in the \"Subject Line\"
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13th September 2009 03:22 AM #16Warpspeed
A better way to make really BIG buried coils is to get some multi strand data cable, and just connect all the conductors in series.
That way, the underground loop is already waterproof, only the ends where all the connections are, needs to be protected.
And that can be above ground, or even indoors.0
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14th September 2009 06:29 AM #17butyokz
thanks it would really help... nice one
0Last edited by butyokz; 14th September 2009 at 06:35 AM.
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22nd October 2009 09:55 PM #18The Mad Professor
Why stop there?
A smaller version that could use inductance changes to detect a person would make for a really useful way of controlling garden path lights.. or even maybe dance floors...think Michael Jacksons 'Bille Jean' video.0
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23rd October 2009 08:16 PM #19colin55
The vehicle detector may work but the output of the LM393 is not connected to the LED correctly. The whole circuit could be done much simpler with a 74c14. A 4 turn coil 6feet diameter will be about 60uH not 18 uH as you suggest. Using 60uH coil and 470n capacitor produces resonance at approx 30kHz.
0Last edited by colin55; 23rd October 2009 at 08:45 PM.
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10th November 2009 02:25 PM #20maxmcp
Lm392n
Hi,
I am fairly new to the electronics projects scene, this project looks good, I am finding it a little difficult to find a LM393, but have found a LM392N which seems to have the same pin outputs. Does anyone know whether I could use this instead of the 393, or a good electronics supplier in the UK?
Thanks!
Max0
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