Configuring the output

Create a new row in the outputs tab of the main window

Double-click on the bottom row where the description says Double-click row to add new config… and enter a description for the output. For example, enter Parking brake for an LED that will show the state of the parking brake.

Open the output configuration dialog

Click the button with three dots in the Edit column for the row created in the previous step.

Filter the output presets

On the Sim Variable tab, use the Filter Preset List dropdowns to filter by Microsoft, Generic, and Controls.

Select the parking indicator preset

Use the Select Preset dropdown to select the PARKING BRAKE INDICATOR preset.

Select the board and device type for the output

On the Display tab, use the Module and Use type of dropdowns to select your connected board and the LED / Output device type.

Select the LED to use for display

Use the Select Pins dropdown to select the LED device that should display the output value.

Close the dialog and try it out

Click the OK button to close the dialog, then spawn an airplane in Microsoft Flight Simulator.

Make sure the MobiFlight Run button is clicked in the toolbar, then try toggling the parking brake in the simulator. The attached LED should light up when the parking brake is applied.