Touch LED#

Introduction#

The VEX IQ Touch LED is both a light and a button. It can glow in different colors to give feedback, such as signaling that the robot is ready, showing which mode is selected, or matching a color detected by another sensor, and it can detect when it’s being touched, letting you start or change a robot’s behavior with a tap.

Below is a list of all blocks:

set Touch LED color#

The set Touch LED color stack block sets the color of the Touch LED using the current transition speed and brightness settings.

    set [TouchLED1 v] color to (none v)

Parameters

Description

touch led

Which Touch LED’s color to set, configured in the Devices window.

color

Sets the LED’s color to:

  • none — Turns off the Touch LED
  • red
  • green
  • blue
  • white
  • yellow
  • orange
  • purple
  • red violet
  • violet
  • blue violet
  • blue green
  • yellow green
  • yellow orange
  • red orange
You can also insert the Optical color name and Color color name reporter blocks to make the Touch LED match the color currently detected by the Optical Sensor or Color Sensor.

Example

    when started
    [Blink the TouchLED off and on.]
    forever
    set [TouchLED1 v] color to (green v)
    wait (0.5) seconds
    set [TouchLED1 v] color to (none v)
    wait (0.5) seconds

    when started
    [See what color the Optical Sensor is detecting.]
    forever
    set [TouchLED1 v] color to ([Optical1 v] color name)
    wait (0.5) seconds

set Touch LED fade#

The set Touch LED fade stack block sets how fast the Touch LED will transition between colors.

    set [TouchLED1 v] fade to [slow v]

Parameters

Description

touch led

Which Touch LED’s transition speed to set, configured in the Devices window.

transition speed

The speed at which the Touch LED will transition to the next color:

  • slow
  • fast
  • off – The color changes instantly with no transition. This is the default behavior of the Touch LED.

Example

    when started
    [Slowly fade TouchLED colors.]
    set [TouchLED1 v] color to (green v)
    set [TouchLED1 v] fade to [slow v]
    wait (2) seconds
    set [TouchLED1 v] color to (red v)

set Touch LED brightness#

The set Touch LED brightness stack block sets the brightness of the Touch LED.

    set [TouchLED1 v] brightness to (50) %

Parameters

Description

touch led

Which Touch LED’s brightness to set, configured in the Devices window.

brightness

The brightness of the Touch LED from 0 to 100 as a percent.

Example

    when started
    [Light up the TouchLED with different brightnesses.]
    set [TouchLED1 v] brightness to (25) %
    set [TouchLED1 v] color to (green v)
    wait (2) seconds
    set [TouchLED1 v] brightness to (100) %

Touch LED pressed#

The Touch LED pressed Boolean block reports whether a Touch LED is currently being pressed.

  • True — The Touch LED is being pressed.

  • False — The Touch LED is not being pressed

    <[TouchLED1 v] pressed?>

Parameters

Description

touch led

Which Touch LED to check, configured in the Devices window.

Example

    when started
    [Change the TouchLED color when it is pressed.]
    set [TouchLED1 v] color to (green v)
    wait until <[TouchLED1 v] pressed?>
    set [TouchLED1 v] color to (blue v)

when Touch LED#

The when Touch LED hat block runs the attached stack of blocks when the Touch LED is pressed or released.

    when [TouchLED1 v] [pressed v]

Parameters

Description

touch led

Which Touch LED to check, configured in the Devices window.

state

When the attached stack of blocks will run: pressed will run when the Touch LED is pressed down, and released runs when the Touch LED is released.

Example

    when [TouchLED1 v] [pressed v]
    [Turn green briefly when pressed.]
    set [TouchLED1 v] color to (green v)
    wait [2] seconds
    set [TouchLED1 v] color to (none v)
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