[amsat-bb] Optical shaft encoders

Daniel Cussen dan at post.com
Wed Mar 16 22:53:58 UTC 2016

You could use an interface like this one:

to read the optical/hall effect encoders. One of the main problems
with this setup is that there is no absolute position sent, so any
pulses missed result in increasing and increasing errors. Also if
there is no end stop switches you can end up moving too far damaging
coax cables.

Normally it is recommended to use separate screened cables for the
sensors to try prevent noise pickup.

Can you link to the sensors you are using and what exact problems are occurring?

On 16/03/2016, Robert McGwier <rwmcgwier at gmail.com> wrote:
> I would like to consider adding optical shaft encoders to augment or
> replace the hall effect sensors in use on an Alfa Spid az/el installation.
> We have the high resolution sensors and are experiencing some annoying
> anomalies that have been very difficult to trace and are detrimental to
> autonomous operation at our ground station at Virginia Tech.
> Any information or help would be appreciated.
> 73s
> Bob
> N4HY
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