Eye

Introduction

The VEX VR Eye Sensor can detect objects and identify their color, and brightness.

Below is a list of all available blocks:

• eye near object – Reports whether the Eye Sensor detects an object within range.

• eye detects color – Reports whether the Eye Sensor detects a specified color.

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

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

eye near object

The eye near object Boolean block reports whether the Eye Sensor detects an object within range.

• True — The Eye Sensor detects an object.

• False — The Eye Sensor does not detect 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 Boolean block reports whether the Eye Sensor detects a specified color.

• 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 green blue

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 reporter block reports how much light is reflected back to the Eye Sensor, as a percentage from 0% to 100%.

A higher percentage means more light is reflected back to the Eye Sensor. A lower percentage means less light is reflected back.

  ([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 hat block runs the attached stack of blocks when the selected Eye Sensor detects or loses an object.

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

Parameters	Description
eye	The Eye Sensor to use.
state	When the attached stack of blocks will run: detects – An undetected object is now detected loses – A detected object is now no longer detected

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