Understanding Indicator Lights on EXP Controller – VEX Library

Notice there are two different indicator lights on the VEX EXP Controller.

Power LED

The first indicator light is called the Power LED.

EXP Controller with its Power LED highlighted.

There are three possible colors of the Power LED to indicate the status of the VEX EXP Controller Battery and of the VEX EXP Radio Link:

	Controller Status	Controller Battery Status
Solid Green	Controller ON - NOT paired with a Brain	Controller Battery level sufficient
Blinking Green	Controller ON - Paired with a Brain	Controller Battery level sufficient
Solid Yellow	Actively Pairing
Solid Red	Controller ON	Controller Battery level low
Blinking Red	Controller ON - Paired with a Brain	Controller Battery level low
Fast Red Blinking	Firmware on your controller is failing to load. View this article.	N/A

If the Controller is not wirelessly connected to a VEX EXP Brain, see this article for more information about wirelessly pairing a VEX EXP Controller and Brain.

Charge LED

The second is called the Charge LED. This LED will only illuminate when the Controller is plugged into a charger.

EXP Controller with its Charge LED highlighted.

There are three possible colors for the Charge LED: green, red, and gray.

Charge LED Color		Status
	Solid Green	Controller Battery is completely charged
	Solid Red	Controller Battery charge in progress
	Blinking Red	Controller Battery fault
	Off	Not charging

See this article for information on how to charge a VEX EXP Controller.