<div dir="ltr">Hi Richard<br>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.<br>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 <span id="spanDisplay" name="spanDisplay"><span class="text1"><span class="text2">Neodymium</span></span></span> 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.<br>
<br><br><div class="gmail_quote">On Wed, Sep 3, 2008 at 10:06 PM, Richard Jones <span dir="ltr"><<a href="mailto:rjtp@ihug.co.nz">rjtp@ihug.co.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I came across this shaft encoder arrangement for the Tamiya Twin-Motor<br>
Gearbox: <a href="http://www.noplabs.com/twinmotor/twinmotor.html" target="_blank">http://www.noplabs.com/twinmotor/twinmotor.html</a><br>
This came via the HBRC mailing list. Andrew showed something along these<br>
lines at one of our robotics meetings several years back.<br>
<br>
Richard<br>
<br>
<br>
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