Andy, I read the datasheet and it looks really easy.
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. at $2.50 each, this is a cool part. The weird thing is the 26.5V supply voltage (clearly made for one customer...). That means an extra power supply and level converters on the outputs. It would be nicer if there was a 5V part (I didn't look for one.) Given that it's built for automotive, it is as close to indestructable as you can easily get for an electronics part. jerry On Wed, Jul 29, 2015 at 10:45 AM, andy pugh <bodge...@gmail.com> wrote: > On 29 July 2015 at 18:41, andy pugh <bodge...@gmail.com> wrote: > > > > > I can't find a source for the sensor in the US. > >> > > > > I think this is the one: > > http://www.digikey.com/product-detail/en/A1233LK-T/620-1487-ND/3878417 > > > > > Actually, that's a 2-channel one, rather than the 1-channel. I don't know > how you would detect the index (the car encoders have a missing-tooth > index) > > -- > 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
