[chbot] Shaft Encoder

[Charles Manning]

Hi Richard
There's an alternative that we are dabbling with using a Hall Effect sensor
that is probably a lot easier to do than shaft encoders.
The Hall Effect sensor is just a 3-pin transistor like device that detects a
magnetic field (eg. UGN3141 from South Island Components). The magnet can be
one of those tiny 2.5mm Neodymium magnets embedded in a gear (Drill a hole
and glue it in). Since some of gears inside the gearbox rotate quite fast
you can get pretty good resolution.


On Wed, Sep 3, 2008 at 10:06 PM, Richard Jones <rjtp at ihug.co.nz> wrote:

> I came across this shaft encoder arrangement for the Tamiya Twin-Motor
> Gearbox: http://www.noplabs.com/twinmotor/twinmotor.html
> This came via the HBRC mailing list. Andrew showed something along these
> lines at one of our robotics meetings several years back.
>
> Richard
>
>
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