Comrades;
 
I have a project with a stepper controlled needle indicator.  I have a simple 8 bit input.  I have a maximum needle speed.  The problem is that I have a jerky needle motion.  I have an IIR filter in the software, and you can see the needle jerk in chunks that resemble binary distances.  (IE the needle surges less and less as it homes in).  I need good snappy response, but I need the needle to move smoothly.  Are there any filter gurus out there that can identify my problem?
 
Thanks
Chris Eddy
Pioneer Microsystems, Inc.