Programming instructions

Reference
Project Lead The Way © and Carnegie Mellon Robotics Academy © / For use with VEX
®
Robotics Systems
Glossary • 11
Glossary continued
Two-way Communcation: See Communcation, Two-way
Ultrasonic Sensor: A sensor that measures distance by emitting ultrasonic sound waves, then measuring how long it
takes them to echo back off of objects or surfaces in the environment. The Ultrasonic Sensor then reports the calculated
distance back to the controller.
Uploading: Transferring data (usually gathered data) from the robot controller to the computer. See also Downloading.
Variable (mathematics): A stand-in for a not-yet-known value in a mathematical equation. Once a variable’s value has
been found, the value can be substituted anywhere in place of the variable.
Variable (experimental): A factor that is either manipulated or measured during the course of an experiment. See also
Independent Variable, Dependent Variable.
Variable (programming): A “container” for a value. The programmer may choose to store a value (perhaps a sensor
reading) in the variable, and use it in a later operation (display it to the screen at the end of the program, for instance). The
programmer may also choose to perform mathematical operations on the stored value, such as adding 1 to it.
Wavelength: The distance between successive equivalent points
on a wave. For example, the distance between two neighboring
peaks on the wave.
While Loop: is a control ow statement that allows code to be
executed repeatedly based on a given boolean condition.
Worm Gear: A special type of gear that uses a screw-like shaft
and a wheel with slanted teeth to reduce speed or transmit torque
between nonparallel axles. Also has the special properties of
being a “one-way” gear and having effectively only one tooth for
gear ratio calculations.
Wavelength
Distance
Pressure
Wavelength
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