On Thu, 5 Mar 2020 at 03:14, Gene Heskett <ghesk...@shentel.net> wrote:

> encoder. But from reading that, I fail to deduct a source for cmd.deriv.

It's a feed-forward input, and the source would be the velocity output
from the motion controller for that joint.
(ie, the motion system outputs both a current position _and_ current
velocity for each joint actuator)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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