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'[OT] Differential inputs (was:Handicap Mouse &Comp'
|Typically the 'Guard' electrode surrounds the two active electrodes to
short out surface leakage currents and improve signal/noise ratio.
is 2 cm. If placed in between the electrodes it is to ensure the best
in the noise pickup to maximize the CMRR.
You can get readymade electrodes (as used for myoelectrically controlled
from Otto-Boc, or other electrically powered prosthetic makers
(Schmidel?). Check with
your local prosthestist or hospital rehab department for local sources
The Otto Boc electrode has a single switched output (with adjustable
controlling open/close of an electric hand so you may be able to use it
as input to mouse switches or the 'mousekeys' program (Microsoft
pgm) with a suitable scan code stuffer.
A now defunct local company (Leaf electronics) made an interface that
a single EMG electrode to control both opening and closing with a single
by use of a graded muscle contraction. A light contraction would open
the hand, a strong
one would close it. I presume that this is now commercially available
but I haven't checked.
Another local company specializes in building devices to assist
with computer control.
There are many other companies out there, and most of their engineers
happy to answer questions about their technology.
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