Capacitive Sensor application help

Discussion in 'The Projects Forum' started by emily123, Feb 17, 2013.

  1. emily123

    Thread Starter New Member

    Feb 16, 2013
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    0
    I wish to use capacitive sensors on two sides of a block to sense the pressure change when pressed. The block surfaces would allow a displacement of about 2mm.

    Could anyone please help me proceed?
     
  2. panic mode

    Senior Member

    Oct 10, 2011
    1,321
    304
    does it have to be contactless sensing? what is your budget? what output type you expect for given change (analog or discrete?)

    while there is plenty of industrial prox sensors, most are inductive, few are capacitive and fewer are with analog output (rare means harder to find and more expensive).
    if you can attach metal plate as target to side of block that changes dimension, you could take advantage of more common inductive linear prox sensors such as
    IWRM-08U9501/S35 (0..2mm)
    FCM1-1804G-V3U2 (0..4mm)
    etc.

    otherwise, check things like:
    http://www.lionprecision.com/capacitive-sensors/cpa100.html

    there are also ultrasound and laser displacement sensors at even higher cost and usually bigger range than what you need.
     
  3. emily123

    Thread Starter New Member

    Feb 16, 2013
    3
    0
    No, there would be human finger contact on the surfaces, I mean the surface would be be actually deformed and the deformation needs to be sensed to digital output.I need analog output which would be proportional to the deformation.

    Budget, well I need good sensitivity. Budget isn't an issue, but I wish to achieve this using capacitive sensing. Is that not a viable approach?
     
  4. panic mode

    Senior Member

    Oct 10, 2011
    1,321
    304
    it is and i posted one such part number. of course there are others too.
     
  5. emily123

    Thread Starter New Member

    Feb 16, 2013
    3
    0
    Alrighty! Thank you !
     
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