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Auto Car Wiper

Discussion in 'Electronic Basics' started by harore, Oct 16, 2006.

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  1. harore

    harore Guest

    Hello..

    I was thinking to make an auto car wiper. I want to know what is the
    best sensor to use for the circuit. Hope you guys can help me.

    Thanks.


    -harore-
    http://www.hobbyelectroniccircuits.com
     
  2. Sjouke Burry

    Sjouke Burry Guest

    How do you intend to wipe out a whole car???????????
    For havens sake, the required battery power alone
    will be enormous.
     
  3. default

    default Guest

    As in windshield/windscreen wiper?

    They use mechanical switches for sensors.
     
  4. harore

    harore Guest

    what I meant is windshield wiper. sorry for the trouble. I want to make
    the wiper automatically switched on when rain drops to the windshield.
    My car is just a small car I used for electronic project. The problem
    is I don't know what sensor I need to use. What do u suggest?
     
  5. jasen

    jasen Guest

    I think a conductive grid is usually used, don't have it "live" all the time
    as that'll wear ir out, just ping it for a microsecond or so every few seconds.

    Bye.
    Jasen
     
  6. Imagine if you will, the wire antenna that is laid against the inside of the
    windshield glass. 2 wire side by side carrying a small signal that is
    coupled between the wires. When the outside of the windshield gets wet, the
    water acts as capacitor connected to the 2 wires and thus you get more
    signal on the receive wire. There you have a capacitive coupling rain
    sensor. You can use that to activate the wipers with of course the signal
    and trigger circuits. Hope this gives you ideas. :)
     
  7. Puckdropper

    Puckdropper Guest

    That's why it will have an alternator on board. :)

    Puckdropper
     
  8. Puckdropper

    Puckdropper Guest

    That's an interesting idea. I've seen "rain detection" circuits that are
    basically two wires spaced a drop's space apart, and I was thinking
    that'd never work for a windshield. With your idea, it's possible to
    cover a much larger area and thus turn the wiper on when needed.

    Puckdropper
     
  9. harore

    harore Guest

  10. default

    default Guest


    Came across a circuit the other day similar to what Mr. Thompson was
    suggesting. That's how I'd do it too - less problems with electrode
    corrosion and dirt build up giving false positives - like you'd run
    into with a contact sensor.

    http://www.imagineeringezine.com/PDF-FILES/capgage.pdf

    It is for a level gauge in a tank, but could be adapted for on/off
    indications easily enough. I doubt you'd need a crystal controlled
    oscillator for it, and moving the frequency higher may make it more
    sensitive with less electrode area . . .

    Another possibility is using a mechanical humidity sensor - nylon rope
    webbing, under tension, seems to elongate when it is wet. Its
    possible to make a decent mechanical humidity sensor from horse hair
    (sold for violin bows) - but that wouldn't be ideal for outside.
     
  11. Dan Akers

    Dan Akers Guest

    "I was thinking to make an auto car wiper. I want to know what is the
    best sensor to use for the circuit. Hope you guys can help me."

    Re: You can purchase window defrost strip repair "paint" at automotive
    parts outlets. This is a conductive paint that is used to repair the
    heat strips that are laminated onto automotive windows; usually the
    rear window. It adheres well to glass. You could apply this to the
    outside of the windshield in two, closely spaced strips, to act as the
    sensor. When the glass between the strips becomes wet, this would
    provide the conductive path for your wiper activation circuit. I
    suppose you would have to experiment with spacing and placement of the
    "strips".

    Dan Akers
     
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