Events

Introduction

The Events blocks in VEXcode allow for event-driven coding, enabling different parts of a project to run in response to triggers such as project start, received events, or user interactions. Below is a list of available blocks:

• when timer – Runs a stack of blocks after the timer exceeds a specified time.

• when started – Runs the attached stack of blocks when the project starts.

• when I receive event – Runs the attached stack when a specific event is broadcast.

• broadcast event – Triggers an event without pausing execution.

• broadcast event and wait – Triggers an event and pauses execution until the event’s tasks complete.

when timer

The when timer block activates the attached stack of blocks after a specified amount of time.

The when timer hat block.

  when timer > [1] seconds

Parameters	Description
time	Specifies the number of seconds before the attached stack of blocks starts. Accepts both whole and decimal numbers.

Example

when timer > [2] seconds
[Move the 6-Axis Arm after 2 seconds.]
increment [arm v] position by x:[100] y:[0] z:[0] [mm v] ▶

when started

The when started block runs its stack when the project begins. You can have multiple when started blocks to run multiple stacks of blocks at once.

The When started hat block.

    when started

Parameters	Description
	This block has no parameters.

Example

when started
[Move the 6-Axis Arm 100 millimeters along the x-axis.]
increment [arm v] position by x:[100] y:[0] z:[0] [mm v] ▶

Parameters	Description
	This block has no parameters.

when I receive event

The when I receive event block starts a stack when a matching event is broadcast. You can have multiple when I receive event blocks to run multiple stacks of blocks at once.

The When I receive event hat block.

    when I receive [my_event v]

Parameters	Description
event	The event to be triggered. Users can select an existing event, create a new one, rename the selected event, or delete it.

Example

  when started
  [Move the 6-Axis Arm 100 millimeters along the y-axis.]
  increment [arm v] position by x:[100] y:[0] z:[0] [mm v] ▶
  broadcast [move_y v]

  when I receive [move_y v]
  print [Received!] on console ◀ and set cursor to next row
  increment [arm v] position by x:[0] y:[100] z:[0] [mm v] ▶

broadcast event

The broadcast event block triggers any matching when I receive event hat block. It does not pause the execution of the stack and continues running the next block immediately.

The Broadcast event stack block.

    broadcast [message1 v]

Parameters	Description
event	The event to trigger. Users can select an existing event, create a new one, rename the selected event, or delete it.

Example

  when started
  [Move the 6-Axis Arm 100 millimeters along the y-axis.]
  increment [arm v] position by x:[100] y:[0] z:[0] [mm v] ▶
  broadcast [move_y v]

  when I receive [move_y v]
  print [Received!] on console ◀ and set cursor to next row
  increment [arm v] position by x:[0] y:[100] z:[0] [mm v] ▶

broadcast event and wait

The broadcast event and wait block triggers an event, then pauses execution of the current stack until all triggered when I receive event block stacks have completed.

The Broadcast event and wait stack block.

    broadcast [message1 v] and wait

Parameters	Description
event	The event to trigger. Users can select an existing event, create a new one, rename the selected event, or delete it.

Example

  when started
  [Move the 6-Axis Arm 100 millimeters along the y-axis.]
  increment [arm v] position by x:[100] y:[0] z:[0] [mm v] ▶
  broadcast [move_y v] and wait
  print [Finished moving!] on console ◀ and set cursor to next row


  when I receive [move_y v]
  print [Received!] on console ◀ and set cursor to next row
  increment [arm v] position by x:[0] y:[100] z:[0] [mm v] ▶