Re: Help with encoder

By jove Jon you jarred loose a piece of my brain cells! Run the
motor slowly and lock channel 1 of the scope to an output and find
the matching 90 degree phase shift! I was rotating the shaft by hand
and with 500 ppr it was not possible to find the right pair. Your
description of the positioning problem seems to be on track.

Thanks. As for the part number (to Tim): They are at home and I am
at work so it will have to wait until this evening. Thanks for the
response.

> Using A and B\ is OK,
> they have a 90 degree phase relationship, too. But, if you used A

and

> A\, then you would have
> 180 degree difference between them. The Gecko might actually seem

to

> work OK by counting
> the edges, but it would most likely be making large errors in
> positioning, as it would not
> likely be getting good direction info this way. You should be able

to

> see the 90 degree phase
> shift pretty easily. You might run the motor on a D cell to get a
> constant speed.
>
> So, if the yel-blu signals are 180 degrees out of phase, use yellow

and

> orange, for instance.
>
> Jon