Andy, Thanks for the info about how the cars came to use a missing pulse. I love how these historic things come back around. It's great that the standard railroad gauge is set to the width to the wheels of a roman war chariot.
jerry On Wed, Jul 29, 2015 at 12:21 PM, andy pugh <bodge...@gmail.com> wrote: > On 29 July 2015 at 19:42, Jerry Scharf <jsch...@finsix.com> wrote: > > The "dual channel" is the independent output of the two hall effect > > transducers (available only in the surface mount part.) The other two > > outputs are direction (simple binary pin) and speed. Speed is the XOR of > > the two transducers, so it produces a full square wave for each magnet > pass > > under the device. You can then either time between edges of the square > wave > > to get an instantaeous angular velocity or between square waves to get > the > > rotation rate. Way easier that looking for a missing pulse. > > > > Most LinuxCNC applications (especially a lathe spindle) need an index > pulse. > Car engines need an index pulse too, but they do that by having a missing > tooth. (traditionally it was a shorter tooth on the starter ring-gear). > > 26.5 is absolute max voltage. The normal working range is 5 to 24V, so it > will work in just about any automotive application. > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Jerry Scharf FINsix IT 650.285.6361 w 650.279.7017 m ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
