Vex Robotics

Vex motors have how many wires?

• 2 wire

• 3 wire

• 1 wire

• 4 wire

What helps the motors run on the Vex Test Bed?

• Servos

• Limit switch

• Encoder

• Motor controller

Check which of the following are digital sensors

• Limit Switch

• Flashlight

• Ultra Sonic Range Finder

• Bump Switch

Check which of the following is an analog sensor

• Limit Switch

• Light Sensor

• Line Follower

• Potentiometer

How does a potentiometer work?

• –Internal mechanical stops prevent potentiometer from turning a full revolution

• –Excess torque against the internal mechanical stops will cause them to wear away

• –Measures rotation of a shaft

  between 0 and ~265 degrees

• –Analog sensor

Which of the following are true for the Ultra Sonic Range Finder?

• –Similar to how bats and submarines

  sense distance

• –Digital sensor returns distance values between 0 and 255 inches or the equivalent centimeters or millimeters

• –Returns values of -1 or -2 if used outside of this range or if a return signal is not sensed

• Is an analog sensor

This sensor can control the distance which a robot moves by monitoring the angle at which the wheels attached to the shaft encoder spin. Which sensor is it?

• Flashlight

• Optical Shaft Encoders

• Motors

• Servos

Check the following that are responsible for the movement of the robot?

• Servos

• Flashlight

• Motors

• LEDs

The line follower needs what color to operate?

• White

• Yellow

• Blue

• Black

The Ultrasonic Finder works by which of the following?

• •Ultrasonic Range Finder detects objects in a “cone” field of view

• •Sensor detects object distance from the center of the sensor

• Plays music

• •Sensor distance calculations based on sound waves