Eye

Introduction

The VEX VR Eye Sensor can detect objects and identify their color, brightness, and hue. It also allows you to adjust detection range and lighting settings for more accurate readings.

Below is a list of all available blocks:

• eye near object? – Returns whether the Eye Sensor is near an object.

• eye detects color? – Returns whether the Eye Sensor detects a specific color.

• eye brightness – Return the brightness detected by the Eye Sensor.

• when eye – Executes the attached stack of blocks when the Eye Sensor detects or loses an object.

eye near object?

The eye near object? block returns a Boolean indicating whether or not the Eye Sensor detects an object within range.

• True – The sensor has detected an object.

• False – The sensor has not detected an object.

  <[FrontEye v] is near object?>

Parameters	Description
eye	The Eye Sensor to detect objects with.

Example

  when started
  [Stop driving after detecting an object.]
  drive [forward v]
  wait (0.1) seconds
  wait until <[FrontEye v] is near object?>
  stop driving

eye detects color?

The eye detects color? block returns a Boolean indicating whether the Eye Sensor detects a specified color, based on the detected hue value.

• True – The sensor detects the specified color.

• False – The sensor does not detect the specified color.

  <[FrontEye v] detects [red v]?>

Parameters	Description
eye	The Eye Sensor to detect colors with.
color	The color to detect: red – A detected hue value between 340°-20°. green – A detected hue value between 80°-145°. blue – A detected hue value between 160°-250°.

Example

  when started
  [Stop driving after detecting a green object.]
  drive [forward v]
  wait (0.1) seconds
  wait until <[FrontEye v] detects [green v]?>
  stop driving

eye brightness

The eye brightness block returns the brightness detected by the Eye Sensor from 0% to 100%.

  ([FrontEye v] brightness in %)

Parameters	Description
eye	The Eye Sensor to detect brightness from.

Example

  when started
  [Display whether a detected object is bright.]
  drive [forward v]
  wait until <[FrontEye v] is near object?>
  wait (0.1) seconds
  if <([FrontEye v] brightness in %) [math_less_than v] [70]> then
    print [Object not bright.] ▶
  else
    print [Bright object!] ▶

when eye

The when eye block runs the attached stack of blocks when the selected Optical Sensor detects or loses an object.

    when [FrontEye v] [detects v] an object :: hat events

Parameters	Description
eye	The Eye Sensor to use.
state	Which action to trigger the hat block: detects loses

Example

    when [FrontEye v] [loses v] an object :: hat events
    [Find an object when it is lost.]
    turn [right v]
    wait until <[FrontEye v] is near object?>
    stop driving