4.2.3. The GPIO Tab
The GPIO Tab allows you to interact with all the general purpose user I/O components on your board. You can turn LEDs on or off and detect I2C target devices connection status.
The following sections describe the controls on the GPIO tab.
The read-only I2C target devices control displays the connection status of devices which can be accessed by I2C bus. Unplug some devices to see the graphical display change.
The User LEDs control displays the current state of the user LEDs. Toggle the LED buttons to turn the board LEDs on and off.