4-1 Multiplexing Analog Signals into Labview

Discussion in 'The Projects Forum' started by ryan_o, Sep 25, 2009.

  1. ryan_o

    Thread Starter New Member

    Sep 25, 2009
    2
    0
    Hello,

    I have built a custom PCB using 16 force sensors, and necessary op-amps to create an output of 0-5V which I capture using a 16 channel National Instruments DAQ card. My desire now is to expand the sensor count and use the same capture card so I'm guessing I will have to multiplex at the cost of sampling rate.

    Could someone please point me in the right direction to do this? I've never used multiplexing circuits and am not really sure where to start. Ideally I would like to use a 4-1 analog multiplex for 64 sensors into 16 inputs. Is it possible to then demultiplex through software (labview)? It would be perfect if I could have a timed signal as follows:

    sens1-sens2-sens3-sens4-sens1-sens2-sens3-sens4 ...

    I would like to maintain a minimum of 100Hz for each channel, but ideally 1000Hz is what I'm after.

    Thanks for your help!
     
  2. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,039
    287

    Howdy:

    I don't know what your budget is for this. If you're using a PXI cage, there are multiplexers available for doing just this:

    http://zone.ni.com/devzone/cda/tut/p/id/6304

    Eric
     
  3. ryan_o

    Thread Starter New Member

    Sep 25, 2009
    2
    0
    Sorry no PXI, I'm using a USB-6210, and cost is unfortunately a factor. Thanks for the suggestion though!
     
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