Blocks

The VEX AIR Blocks API Reference explains what each VEXcode block does, how its inputs change the drone’s behavior, and how the block can be used in a project.

Use this reference when you want to understand a block before adding it to a project, check what a block reports, or compare similar blocks in a category.

Blocks are used in VEXcode AIR Blocks projects. Python projects use the text-based API section instead.

How to Read a Block Entry

Most block entries include the following parts:

• Block description - Explains what the block does and when it is useful.

• Block image - Shows what the block looks like in VEXcode AIR.

• Parameters - Lists the inputs on the block and explains how each input affects the drone or project.

• Return value - Explains what a Boolean or Reporter block reports.

• Example - Shows one way the block can be used in a project.

Common Block Types

Different block shapes have different jobs in a project.

Block Type	What it means
Stack	A block that performs an action. Stack blocks connect above and below other blocks in a stack.
Hat	A block that starts a stack of blocks when something happens, such as when the project starts or an event occurs.
Boolean	A block that reports True or False. Boolean blocks are often used inside conditions, such as if then or wait until blocks.
Reporter	A block that reports a value, such as a number or text. Reporter blocks are often used inside other blocks.
C block	A block that wraps around other blocks and controls when or how they run, such as repeating blocks or if then blocks.

Example Block Entry

move

The move block moves the drone in four specific directions using the current move velocity.

move forward stack block

    move [forward v]

Parameters	Description
direction	Move the drone in one of the following directions: forward right left reverse

Example

    when started
    [Move forward for 2 seconds.]
    take off to [500] [mm v] ▶
    move [forward v]
    wait [2] seconds
    land ▶