On Wed, 2010-12-01 at 12:59 -0500, Stephen Wille Padnos wrote: ... snip > What you really want is an edge detector that's controlled by the home > switch. When the switch output is 0, the output of the detector is 0. > When the home switch is 1, the next rising edge of the encoder will set > the detector output high until the home switch goes back to 0. This > would effectively delay the switch output until an index is seen, but > would leave the home switch output high until the switch is no longer > active, which is a requirement of a home switch. > > I haven't written out the actual logic, but I could sure do it with an > AVR :) > > - Steve
I think there is another problem if the home switch edge "fuzzy" zone can have more than one index pulse in it. Each home and index system needs to take into account how wide the home pulse is, how wide the worst-case home fuzzy zones are, and how close are the index pulses. Having a 180 degree lead screw flag is looking attractive. So, home AND flag AND index? -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
