Looking for a rotary position sensor

Discussion in 'The Projects Forum' started by Santhakumar, Aug 23, 2016.

  1. Santhakumar

    Thread Starter Member

    Mar 17, 2015
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    Hi ,

    I have been looking for rotary position sensing device (might be angle measuring Device)
    I Don't want to use any magnet (Hall effect sensors)..so help me with Inductive or capacitive angle measuring device if available.

    -Santhakumar.
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Googling 'optical rotary encoder' will find you some.
     
  3. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    You might also look at capacitative encoders, such as the AMT/CUI ones: http://www.cui.com/amt-modular-encoders

    If you search on mechanical encoders (e.g., at DigiKey), you will find a lot of inexpensive ones. CUI makes the too.

    John
     
  4. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    A potentiometer with a linear-taper makes a great and simple angle measuring device. Simply connect the two static legs to positive and ground reference - then measure the wiper pin to get your angle as the pot is turned. The higher the pot quality, the better performance is possible.
     
  5. hp1729

    Well-Known Member

    Nov 23, 2015
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    Through how many degrees of rotation and with what precision?
     
  6. Santhakumar

    Thread Starter Member

    Mar 17, 2015
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    At least 180 degrees.I want it to be contactless. Precision can be 5 degrees
     
  7. crutschow

    Expert

    Mar 14, 2008
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    If you tell us exactly what you are trying to measure the rotational angle of, we can give better suggestions.
     
  8. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    The capacitative sensors are contactless and well more accurate than 5°. Since you mention "angle measuring device" a simple accelerometer will give angles relative to Earth well within your 5° criterion. It is a simple calculation to find the angle between two legs, given that data (assuming 2 dimension).
     
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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    One problem with incremental encoders is they need to be referenced at power on, the absolute are typically 12bit with up to 16bit available.
    The CUI John mentions have absolute as well as incremental.
    This is a simple BCD etc.
    upload_2016-8-24_12-26-32.png
     
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