LM2917 and XBand Motion Sensor help

Discussion in 'The Projects Forum' started by JerseyTechGuy, Feb 11, 2012.

  1. JerseyTechGuy

    Thread Starter New Member

    Feb 11, 2012
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    0
    I am working on a project where I am reading High/Low changes from an XBand Motion sensor from Parallax (32213). While the software solution works fine it is a resource problem as I have other sensors to read from the Micro Processor in it's scanning loop. Someone recommended looking at using an LM2917 FtoV converter so I can simply read the voltage on an analog input to the MP (I think the max is 3.3v).

    Does anyone have experience with the LM2917 that can suggest a circuit to use for this? I can handle the software end, my hardware skills are a bit rusty.
     
  2. DickCappels

    Moderator

    Aug 21, 2008
    2,653
    632
    The LM2917 is a pretty simple circuit. Used it once, a very long time ago and the chip did its job without any problems. Have a look at the example circuit in the upper-left hand corner of the document at the URL below. All you would need to do is scale the parts for your particular desired frequency range.

    http://www.freeimagehosting.net/prauh
     
    Last edited: Feb 12, 2012
  3. JerseyTechGuy

    Thread Starter New Member

    Feb 11, 2012
    2
    0
    I'll probably have to write some software to figure out the frequency range when motion is detected. Not sure of the range. Thanks for the link!
     
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