Programming instructions

accessories
sensor accessories
Optical Shaft Encoder Kit
Optical Shaft Encoder Kit • 1
For More Information, and additional Parts & Pieces refer to:
www.VexRobotics.com
Limited 90-day Warranty
This product is warranted by Innovation First against manufacturing defects in material and workmanship under normal use
for ninety (90) days from the date of purchase from authorized Innovation First dealers. For complete warranty details and
exclusions, check with your dealer.
Innovation First, Inc.
1519 IH 30 W
Greenville, TX 75402
08/07
Basic Optical Shaft Encoders are commonly used for position
and motion sensing. Basically, a disc with a pattern of cutouts
around the circumference is positioned between an LED and a light
detector; as the disc rotates, the light from the LED is blocked in a
regular pattern. This pattern is processed to determine how far the
disc has rotated. If the disc is then attached to a wheel on a robot,
it is possible to determine the distance that wheel traveled, based
on the circumference of the wheel and the number of revolutions it
made.
With the Quadrature Encoder, there are 2 output channels. Only
one output can be used as a basic Optical Shaft Encoder. The
term quadrature refers to the situation where there are two output
channels; that is, two square waves 90 degrees out of phase with
each other, being outputted by the unit. The two output channels of
the Quadrature Encoder can be used to indicate both position and
direction of rotation.
YOU MUST HAVE A
PROGRAMMING KIT
TO USE THIS SENSOR!
Optical Shaft Encoder x 2
Screw x 4 (8-32, 3/8”) Keps Nut x 4
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