Accelerometer Data Help

Discussion in 'The Projects Forum' started by monkles, Feb 9, 2010.

  1. monkles

    Thread Starter New Member

    Aug 6, 2009
    9
    0
    Hey guys,

    Trying to use an accelerometer at the moment for a project im working on. Im using a SHIMMER and I was just wondering how to use the accelerometer data and how I convert it into g's. It's a tri-axial accelerometer and this is and example of the raw accelerometer data.

    2201,1975,2018,2223,2188,2046,63416
    2202,1980,2015,2226,2196,2046,63736
    2203,1982,2012,2214,2170,2046,64056
    2199,1982,2014,2223,2185,2046,64376
    2198,1983,2008,2203,2151,2047,64696
    2194,1983,2016,2209,2152,2046,65016
    2201,1981,2019,2222,2181,2046,65336
    2198,1983,2016,2215,2169,2046,120
    2199,1977,2013,2221,2183,2047,439
    2197,1976,2008,2204,2147,2046,759
    2203,1983,2011,2211,2154,2047,1079
    2202,1986,2019,2223,2183,2046,1399

    The only observation I can make is that the values in the right column don't go above 66000!! Can anyone tell me what these values mean and what they're measured in?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Do you have the data sheet for the accelerometer? What is it's output like? What is reading that output?
     
  3. monkles

    Thread Starter New Member

    Aug 6, 2009
    9
    0
    This is the datasheet for the accelerometer and I am using Biomobius software which saves the accelerometer data to a file.
     
    Last edited: Feb 9, 2010
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    More information is needed.
    1. What was the accelerometer doing to produce those numbers?
    2. How can one distinguish one channel from another?
    3. What was the resolution of the ADC that read in the data? What is the full scale response?
    4. What does Biomobius software do? Did it scale the input in some way?
    5. Was there a set of amplifiers between the ADC and the accelerometer output? If so, what was the gain?
    6. Help us out - what is a "SHIMMER", in some detail.
    7. If one is available, post up a schematic of the circuit.
     
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