On Thursday 23 February 2017 22:44:19 Jon Elson wrote: > On 02/23/2017 08:31 PM, Gene Heskett wrote: > > But I think its something we may be able to outwit in the hal file. > > > > They appear to have a power save shutdown, and a power up lag. > > > > And seem to have timings independent from each other. This is going > > to cause, unless we scale the encoder down by 4, one edge received > > occurs just as you start to turn it by hand, and again some > > milliseconds later after YOU have stopped turning the dial. When you > > stop moving it, it goes back to zero volts a few milliseconds later. > > Sorry, Gene, you are wrong. They don't power down, but the > detent draws the dial to the state where A=B=0. > If you hold the dial between detents, the A or B outputs > hold at whatever level they should. When you let go, it > drops into the detent again, and outputs are zero. This is > all as it should be. > > YES, it gives 400 quadrature counts per rev, so you need to > scale the encoder by a factor of 4 to get rational units per > detent step. > > Jon > I wondered if that might not be the case, but I still got the same behaviour when I tried to hold it between detents. Maybe my bit of hand shake fooled me. They aren't as steady as they once were. :(
That was just powered up on the table watching it with the fawncy sampling scope. That I haven't 100% learned to run yet, its too darned automatic. Thanks Jon. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
