On Friday 02 October 2009, Andy Pugh wrote: >2009/10/2 Steve Blackmore <st...@pilotltd.net>: >> On page 6 I changed the sampling rate to base thread. >> >> http://filebin.ca/wacbfm/screenshots.pdf > >Aha! I see noisy encoder signals. That seems to be confusing the >velocity calculation (but possibly not the position calculation) >I am also a little surprised that the mark-space ratio on channels A >and B differs. I don't know enough about the subject to know if that >matters. > Yes it does Andy. If the lack of a 50% duty cycle places one edge closer than the other, then it can miss-track because of miss counts at a much lower rpm going one way than the other.
The ideal is a 50-50 duty cycle, with the edges of one signal at exactly the center of the flat part of the signal from the other channel. Regardless of direction its being turned. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> Robot, n.: University administrator. ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
