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Vehicle Loop Detector

Discussion in 'Electronic Projects' started by chemelec, Jul 15, 2007.

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  1. chemelec

    chemelec Well-Known Member

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  2. Conrad_Turbo

    Conrad_Turbo New Member

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    Thanks! I might be putting something like this in my driveway and tie it to some outside lighting. :D
     
  3. wizy

    wizy New Member

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    that good staf
     
  4. dave

    Dave New Member

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  5. Hydrogenboy

    Hydrogenboy New Member

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    Just a question, but how do you make the coil? I know it says it has to be 4 - 6 feet in Diamater, and about 3 - 4 turns, but how do you make that? Do you get something that is 4 - 6 feet in diamater, and just wrap wire around it?
    Thanks.
     
  6. chemelec

    chemelec Well-Known Member

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    It Doesn't have to be That Size, But for detecting a Car, that works good.

    One Way to wind the coil: just stick some wooden sticks in the ground, with a spacing as needed, than wind the coil around them to make that diameter of a coil. When finished, tape the wires to hold them together and remove the sticks.

    Or if you want to try a smaller coil, wind it loosly around a Garbage can, than tape the wires together so thay stay as a coil and remove it from the can.
    For a Smaller Coil like this, You might need 10 to 15 turns.

    Hope this helps.....Gary


     
  7. Hydrogenboy

    Hydrogenboy New Member

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    Yes, it helps.
    Thanks.
     
  8. reyarba

    reyarba New Member

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    This is interesting. I always wondered about those marks on the asphalt road at the crossings. Would be very interesting to build similar systems.

    Thanks for this project.
     
  9. Hydrogenboy

    Hydrogenboy New Member

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    Another question (yes I ask alot!) Does the wire have to be stripped, or can it be insulated?
    Thanks.
     
  10. kchriste

    kchriste New Member Forum Supporter

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    Definitely insulated! Preferably placed inside plastic conduit or something similar if you intend to bury it in the ground.
     
  11. chemelec

    chemelec Well-Known Member

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    Any Vinal Covered wire is OK, Just buried as is.
    (Like a 16 or 18 gauge Solid house wire is good.)
     
  12. wmerrin

    wmerrin New Member

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    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?

    Wally
     
  13. chemelec

    chemelec Well-Known Member

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    Forget the PVC Pipe. It is NOT NEEDED!

    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.
     
  14. praveen kumar singh

    praveen kumar singh New Member

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    ya its great!!!!!
     
  15. yehey

    yehey New Member

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    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.
     
  16. chemelec

    chemelec Well-Known Member

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    Aproximately 18uH.
     
  17. Warpspeed

    Warpspeed Member

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    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.
     
  18. butyokz

    butyokz New Member

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    thanks it would really help... nice one
     
    Last edited: Sep 13, 2009
  19. The Mad Professor

    The Mad Professor New Member

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    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.
     
  20. colin55

    colin55 Well-Known Member

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    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.
     
    Last edited: Oct 23, 2009
  21. maxmcp

    maxmcp New Member

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    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!

    Max
     
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