How to Read Indicator Lights on the VEX IQ Controller

Notice there are two different indicator lights on the Controller. The first indicator light is called the Power / Radio Link LED.

There are two possible colors of the Power / Radio Link LED to indicate the status of the VEX IQ Controller Battery and of the VEX IQ Radio Link:

Power / Radio Link LED Color Status

Solid Green Controller ON - Controller Battery level sufficient - with NO Radio Link (searching)

Blinking Green Controller ON - Controller Battery level sufficient - with good Radio Link.

Solid Red Controller Battery level low - with No Radio Link

Blinking Red Controller Battery level low - with good Radio Link

If the Controller’s LED is not blinking, the Controller is not wirelessly connected to the VEX IQ Robot Brain. Connecting with the Tether Cable overrides the wireless connection and the Controller’s LED will show solid green. Click here for instructions for properly linking (wirelessly connecting) the Controller with the Brain.

The second is called the Charge LED. 

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

Click here for instructions for charging the Controller Battery.