The color of the Brain’s LED indicates the status of the Brain, the VEX IQ Robot Battery, and the VEX IQ Radio Link.
|Brain ON - Robot Battery level sufficient - with NO Radio Link (searching).
|Brain ON - Robot Battery level sufficient - with good Radio Link.
|Robot Battery level low - with No Radio Link
|Robot Battery level low - with good Radio Link
Note: Depending on the battery load, if the battery drops into the red zone, the LED will remain that color until it is powered off, but the Robot Brain LCD Screen will always show the current voltage level.
Click either of these links for further instruction: