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Event-based programming

If your dog brings you his leash or sits by the door, he’s letting you know that he needs to go outside. In school, when your teacher asks a question and sees you raise your hand, they believe you know the answer and would like to answer the question. These behaviors are also known as “triggers.”

Your dog knows that bringing you his leash or sitting by the door is the trigger that lets you know he needs to go outside. So, when you see him sitting by the door with his leash, you react to the trigger by taking him outside. Raising your hand is the trigger that lets the teacher know you would like to answer the question. The teacher then reacts to the trigger by calling upon you.

Event-based programming in robotics is when certain robot behaviors trigger the robot to do certain things or react to certain triggers.

Controller: Clawbot Control

Now, you’re ready to download the Clawbot Controller with Events example project and use the Controller to operate the Clawbot, its Arm, and its Claw, all at the same time!

Clawbot Controller with Events Example Project

Ensure you have the hardware required and your engineering notebook. Open VEXcode V5.

Materials Required:
Quantity Materials Needed



Charged Robot Battery


VEX V5 Radio




Tether Cable


VEXcode V5


USB Cable (if using a computer)


Engineering Notebook

Before you begin the activity...

Do you have each of these items ready? The Builder should check each of the following:

  • Are all the motors and sensors plugged into the correct port?

  • Are the smart cables fully inserted into all of the motors?

  • Is the battery fully charged?

  • Is the Controller paired with the Robot Brain?