On 08/02/2015 04:21 PM, John Kasunich wrote: > He has a homemade encoder with less than perfect 50/50 > duty cycle and less than perfect 90deg phase shift.
This reminds of shopping for opto sensors for making encoders. For my MPG I chose sensors with a very small window or effectively a narrow beam, so the sensor On/Off region is small. I cut the 100 edge disk so the edges were within a couple thousandths of the target location. My oscilloscope shows very regular 50% signals as far as I can tell. Another sensor configuration I've seen uses a wide window with a very fine pitched mask and disk. The whole widow turns light or dark within the pitch of the mask. With this in mind, I would tend to fix the encoder hardware before playing with software. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
