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ultrasonic sensors

Discussion in 'Sensors and Actuators' started by stranger, Jun 18, 2010.

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  1. stranger

    stranger

    3
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    Jun 18, 2010
    i am planning to use car revers parking sensors for sensing in robotics and i found out that there are two kinds of sensors

    one kind have sensors with 3 pins.......which i guesses as vcc ground and signal.....


    the other have two pins so i thought they act as variable resistors depending on distance.....

    am i right?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,363
    2,758
    Jan 21, 2010
    probably not

    If you have part numbers for these parts then you could google for them and see what you get.
     
  3. ChosunOne

    ChosunOne

    351
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    Jun 20, 2010
    Don't know if this helps you, stranger, but the alarm industry used to use lots of ultrasonic sensors decades ago, before they were supplanted by passive infrared sensors. I don't know how the car sensors work, but the ones in alarm systems measured relative velocity between source and target, and operated on doppler effect by comparing the frequency transmitted to the return freq of the echo.

    Dunno if that helps, but I thought I'd toss it out just in case.
     
  4. stranger

    stranger

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    0
    Jun 18, 2010
    yeah.........thanks a lot.......
     
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