Fixing Banggood T3 Flight Mode and Voltage Display Errors in INAV Ground Station

I. Problem Description

Problem 1: When using the BangFeng T3 VTX, switching flight modes with the RC transmitter switch does not change the flight mode displayed on the VTX screen.

Important

Under normal circumstances, the flight mode should change according to the RC transmitter channel position

Problem 2: When using the BangFeng T3 VTX, the voltage displayed on the VTX screen does not match the actual voltage

Important

Under normal circumstances, the actual voltage should be displayed. As shown in the image above, the current flight controller input voltage should be 15.2v

II. Cause Analysis

Causes of incorrect flight mode display:

• Correct port protocol not set in the ground control station
• Or MSP is enabled on the port
  Causes of incorrect voltage display:
• The BangFeng T3 VTX firmware itself has issues and cannot display voltage correctly

III. Solutions

3.1 How to Fix Incorrect Flight Mode Display

Important

Accelerometer calibration must be completed first before switching flight modes

Important

Note: When performing accelerometer calibration, be sure to remove the flight controller from the airframe and place it on a flat surface for calibration to improve accuracy and ensure flight stability!

• Click Calibration.
• Click Calibrate Accelerometer.
• Perform calibration according to the diagram.

Important

After calibrating each side, you need to click Calibrate Accelerometer once.

Important

The diagram below corresponds to the above accelerometer calibration.

Important

After calibration is complete, click Save and Reboot.

CoreWing F405 WING V2:

• Click to enter the port page
• Set the telemetry output baud rate of UART3 to 115200
• Set the protocol to MAVLink, click save and restart
  

3.2 How to Fix Incorrect Voltage Display

• After powering on the ground unit, short press the power button to bring up the main menu
• Short press the power button to select the next item
• Short press the M key to confirm the sky end, click on cell count, and set to 1S

Important

The BangFeng T3 VTX firmware itself has issues, regardless of the number of battery cells used, you must select 1S to display correctly

IV. Verification

Important

After modifying parameters in the ground control station and VTX menu, be sure to disconnect power from all devices, including the flight controller and VTX sky/ground units

Important

If the flight controller is using INAV firmware, accelerometer calibration is also required, otherwise switching flight modes will not change

1. Power on all devices again and bind them
2. After the RC transmitter and receiver are successfully bound, toggle the flight mode switch to confirm if it changes
   

Important

Due to BangFeng T3 VTX firmware issues, the flight mode names set in the ground control station may differ from those displayed on the screen

3. You can verify if the voltage in the upper left corner of the screen is displayed correctly by comparing it with the voltage displayed in the ground control station
   BangFeng T3 VTX Screen:
   
   INAV Ground Control Station:
   

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