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Sensors provide the ability for a robot to receive feedback from the environment. There are a variety of sensors that can be used with the VEX IQ (2nd gen) Brain to obtain different types of input for the robot. The table below provides an overview of what each sensor can do, and examples of how it can be used in a project.
VEX IQ (2nd gen) Sensors
Sensor
Function
Example Uses
Bumper Switch
Tells the robot whether its bumper is pressed (sensor value of 1) or released (sensor value of 0).
Detecting if the robot has bumped into an object, such as a maze wall or game object
Triggering a robot action, when pressed or released
Toggling to turn on or off motors when pressed
Detecting other parts of the robot, such as an arm, when it presses in the bumper
Touch LED
Can detect capacitive touch, such as the touch of a finger.
Can be set to display many colors.
Triggering a robot action when touched
Starting or pausing a program when touched
Displaying different colors during different parts of a program, so it is easier to pinpoint code for troubleshooting
Optical Sensor
Detect the color of an object
Detect an object
Detect the brightness level of ambient light
Measure the numerical Hue Value of an object
White LEDs on the sensor can provide a consistent light source when detecting colors regardless of the surrounding light conditions.
Coding the robot to interact specifically with an item of a certain color, such as sorting cubes by color
Detecting whether an object is present, such as a wall or game object
Triggering the robot to perform a behavior when the light level is at a certain brightness
Understanding precisely how the Optical Sensor is detecting color in varied lighting conditions
Following a line
Detecting whether an object is present
Distance Sensor
Detects if there is an object in front of it
Measures the distance between itself and an object
Determine the relative size of an object
Reports the velocity of an object
Driving forward until the sensor detects that it is a certain distance away from a wall, then stopping driving.
Driving forward a certain distance to pick up a game object
Driving away from an object or surface until it has reached a specific distance
Interacting with an object that is one size and avoiding interacting with an object that is another size, such as picking up only the small balls on a Field
Determining the velocity of an approaching object and printing it on the Brain's screen
Detects and tracks objects, colors, and AprilTags using onboard AI
Detects multiple color blobs at the same time (up to 7)
Recognizes AprilTags for positioning and navigation
Detect and track classroom and game objects (Cubes, Rings, Bucky Balls)
Navigate to or align with AprilTags on the field
Sort or react to objects based on color or type
Make autonomous decisions using visual information
Additional Sensor Information
Note that the VEX IQ (2nd gen) Brain has a built in Inertial Sensor rather than a Gyro Sensor. For detailed information on the sensors described above, see the following articles:
