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A Diagram Explaining the Different States Expressed by the VEX IQ Robot Brain's LED Light.
Robot Brain LED states

The Robot Brain LED can appear in four different states:

  • Blinking Red — The battery is low, but the Robot Brain has a connection to a radio link.

  • Solid Red — The battery is low and the Robot Brain does not have a connection to a radio link.

  • Solid Green — The Robot Brain is ON, the battery has a charge, but the Robot Brain does not have a connection to a radio link. It is currently searching for one.

  • Blinking Green — The Robot Brain is ON, the battery has a charge, and the Robot Brain has a connection to a radio link.