On Mon, Jun 18, 2012 at 9:52 AM, Electron wrote: >>What is the range of your AccX, AccY and AccZ values? > > 0..1023 > >>What value gives you zero g? > > ~512 > > >>What value gives you 1g? > > ~573 > > Vibration biases this a lot, around +100 at low RPM and up to +200 at hig= h RPM. > > I talk about average, i.e. not only there's a lot of AC noise depending o= n RPM, > but also this DC bias component which I was surprised to find, illuding m= yself > that the heavy vibrations would have cancelled out anyway (i.e. no DC, wr= ong). I am guessing that you are just seeing more vibration than your accelerometers are designed to handle, which you are guessing yourself. You could mount them on a rubber isolator or get accelerometers that will not saturate at your level of vibration. --=20 Martin K. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .