Vex CORTEX Manual de Instruções descarregar pdf (Página 130)

accessories

sensor accessories

Optical Shaft Encoder Kit, continued

Optical Shaft Encoder Kit • 2

For More Information, and additional Parts & Pieces refer to:

www.VexRobotics.com

Technical overview

The Optical Shaft Encoder uses an infrared light sensor to detect

illumination from an infrared LED passing through slots cut in

the circumference of a rotating wheel.

From basic geometry, we know that the circumference of a circle is

equal to (pi) times the diameter of the circle.

The distance travelled by a wheel, then, is simply the circumference of

the wheel times the number of revolutions the wheel has made.

For a standard wheel in the Vex Inventor’s kit, the diameter is 2.75”.

So the distance the wheel travelled would be:

x π (pi = approx. 3.14)

circumference

distance = (circumference) x (number of revolutions)

distance = 8.64” x (number of revolutions)

diameter of wheel

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Vex CORTEX Manual de Instruções Página 130