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HELPME.DOC
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1993-05-12
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Most problems with glove accuracy can be attributed to one or
more of the following conditions (in order of commonness):
1) Sensors on or near hard, smooth surfaces. This problem can
be difficult to correct. The ideal place to use the glove is in
a 20' x 20' "room" with ALL WALLS (and ceiling) CARPETED. You
want to get as close to this ideal as you can. Try taping a
thick blanket up against a wall and attaching the sensors
directly to the blanket. If its still not good enough, start
putting blankets up on other walls. You will notice
dramatically better response the "softer" your make your
environment. The problem results because the ultrasonic waves
emitted by the glove (and measured by the sensors) tend to
bounce off smooth hard surfaces. The circuitry interprets the
glove position based on the assumption that the waves are coming
DIRECTLY FROM THE GLOVE. Waves that have been reflected off ANY
object in the room WILL be interpreted incorrectly, and WILL
cause the glove to seem "glitchy" or prevent the glove cursor
from sensing certain positions correctly. "Soft" surfaces made
of thick fabric or foam dampen the waves enough to keep the
sensors from getting confused. It can be disappointing to learn
that the sensors may not belong on a computer monitor, or for
that matter a TV, but this problem is function of the design of
the Power Glove. I have not tried anechoic foam yet, but I have
heard that putting some behind the sensors will stop almost all
the glitches.
2) Objects between glove and sensors. It should be obvious that
the ultrasonic waves cannot travel through objects on their path
to the sensors. Less obviously, objects that are simply in the
vicinity of the path between the glove and the sensors will
reflect ultrasonic waves and cause problems as described in #1.
3) Glove too near or too far from sensors. You should keep the
glove between five and ten feet away from the sensors. If the
glove gets too close, it will become unable to sense certain
positions, and perhaps even fail to detect changes on an entire
axis. If the glove gets too far away, it will "move" even when
you hand is still. Also, the position reported will be
"grainier" that is, it will lose resolution.
4) Connector is wired incorrectly.
This problem can only occur if have built the connector
yourself! If you have verified all of the above and the glove
still fails to work as expected, you should check the wiring.
Another easily overlooked factor is the voltage. Though I have
not experimented with this, I've read messages which state that
the voltage MUST be between +4.5V and +5.5V. If you are using
the 5V wire from your computer, there's nothing to worry about
as long as your computer behaves normally. The keyboard
connector and the joystick connector also have reliable 5V
wires. I've also read messages stating that the connector
should be RFI shielded. Personally, I think that if you solder
the connector and keep the wires outside of your computer case,
you should be OK.
5) Glove is defective - RARE!!! Toys R' Us and other places
are selling "used" (perhaps reconditioned?) gloves that can be
identified by a very beat-up looking box. Be suspicious of any
glove that came in such a box, or any glove that fails to
respond AT ALL after repeated verification of the connector.
6) Weird hardware - RARE!!! A few kinds of parallel ports are
not "bidirectional". There is no sure way to test this except
to read the documentation that came with the computer (or
parallel port add-on). The only other possible problem could be
that your computer is too slow for the software (very unlikely)
or the software is incompatible with your computer, which is
nearly impossible. (Rend386 only runs on '386s or better, Object
Glove demos only on '286s or better.)
Copyright 1992 Mark Thomas Pflaging