AP Flight Controller USB Extender Board LED Status Explanation

Confirm that the flight controller firmware is set to ArduPilot (INAV settings are not applicable, and the connection light does not illuminate under normal conditions). Connect to the flight controller, click on "Initial Setup," proceed to "SERVO OUTPUT," and verify if the 12 channels are displayed as shown in the following image: 

If the channel configuration is normal and the expansion extender board light is not working properly, please contact after-sales service. 

#Flight controller status light indication.

The flight controller is designed with two types of indicator lights: one is the monochrome LEDA (green light) and LEDB (blue light) on the F405WING mainboard, and the other is the Neopixel RGB LED on the USB Extender board.

Monochrome LED Status Explanation

After power-up, the green light usually displays the system status, while the blue light indicates the GPS status. Each flashing sequence in the table below repeats once per second.

For example, when entering ESC calibration mode, the green light will flash at a 50% duty cycle at 4Hz, alternating with the blue light.

RGB LED Status Explanation

Red and blue alternating fast flash: Initializing sensors. Do not move the aircraft.

Red, blue, and green alternating fast flash: Entering ESC calibration mode.

Normal Status

Blue slow flash: Motors locked, GPS not positioned. Auto, loiter, and return-to-home modes require GPS positioning.

Blue steady: Motors unlocked, GPS not positioned.

Green slow flash: Motors locked, GPS positioned, flight controller status normal and ready to unlock at any time.

Green fast flash: Motors locked, GPS positioned (high precision), flight controller status normal and ready to unlock at any time.

Blue steady: Motors unlocked, GPS positioned.

Abnormal Status

Yellow double flash: Unlock check anomaly (cannot unlock at this time, need to connect to the configurator for a check).

Yellow single flash: Executing lost control protection Radio failsafe (pre-set lost control protection logic, default is to hover or return-to-home mode).

Yellow fast flash: Executing battery protection Battery failsafe (pre-set battery protection logic, default is to return home).

Yellow and blue alternating fast flash: GPS positioning drift or GPS lost satellites.

Red and yellow alternating fast flash: EKF failure or IMU sensor failure.

Another type of RGB outputs four-channel RGB LED colors through the LED socket on the WIFI board. The flashing status and colors are the same as the RGB lights on the USB extender board. However, the number of LEDs can be individually defined, up to a maximum of 32.

The brightness and number of LEDs can be controlled by modifying NTF_LED_BRIGHT and NTF_LED_LEN.