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Back to the old thread..<div><br></div><div>I would be interested in a more precise description of that simple trick actually...</div><div><br></div><div>or is there a paper or some reading ???</div><div><br></div><div>How do you calculate the exact x-y-z position from that ??</div><div><br></div><div>Thanks </div><div><br></div><div>Luigi</div><div><br></div><div><br></div><div><br><div><div>Am 17.04.2008 um 22:52 schrieb <a href="mailto:Inventor-66@comcast.net">Inventor-66@comcast.net</a>:</div><br class="Apple-interchange-newline"><blockquote type="cite"><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="4" style="font: 14.0px Helvetica">Normally one would use two 3-axis accelerometers and some signal processing to get a full 6-DOF (Degree Of Freedom) tracker, but there is a simple trick that uses only one.<span class="Apple-converted-space"> </span>What you do is you obtain pitch, roll, and yaw from the gravity vector, or low-pass-filtered component, and the X, Y, and Z from the dynamic acceleration, or high-pass-filtered component.<span class="Apple-converted-space"> </span>It isn't perfect but it does save you a sensor</font></p> </blockquote></div><br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div><div>>---------------------------------------<</div><div><br class="webkit-block-placeholder"></div><div>Luigi Rensinghoff</div><div><a href="mailto:luigi.rensinghoff@freenet.de">luigi.rensinghoff@freenet.de</a></div><div><a href="skype:gigischinke">skype:gigischinke</a></div><div><a href="ichat:gigicarlo">ichat:gigicarlo</a></div><div><br></div></div></span></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline"> </div><br></div></body></html>