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Convertion from adc to si unit for LISY300AL Gyro

Posted by alex sasha on March 26, 2011 at 5:35am

hello,

i  am  using  a  Gyro  LISY300AL  with  dspic30f4011 ( the  same development  plate from  sparkfun),

how  can  i  convert  adc  result  from  gyro  to SI   unit,  for  example  to  rad/sec.

resolution  of  adc  is  10 bit,

and  the  sensetivity  of  the gyro  is  3.3  mv.

15/mv/degree/sec.

 

thanks.

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Replies

  • T3
    William Premerlani March 27, 2011 at 11:39am
    Hi Sebastion and Alex,

    By the way, the conversion factor depends on whether or not you configure the A/D to produce left justified or right justified results. My preference is left justified, it improves the resolution of downstream computations when you oversample. But, coming back to this discussion....

    In the case of right justified, there are 1024 steps on the ADC.

    With a reference voltage of 3.3 volts, that is 3.22 millivolts per step.

    The sensitivity of the LISY gyro is 3.3 millivolts per degree per second.

    You divide 3.22 millivolts per step by 3.3 millivolts per degree per second to get 0.9765 degrees per second per step.

    Which comes out to be 0.017 radians per second per step.

    Best regards,
    Bill
  • Sebastian Gralla March 26, 2011 at 6:14am

    so you have 1024 steps on your ADC

    I assume that you reference volatge is 3.3V

    -> each ADC step is 3.22mV

    -> each ADC step is 0.465°/s

     

    conversation to rad/s -> 0.00812rad/s/step

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