Using Telemetry with Flight Controllers

I. Principle

The telemetry module enables data communication between the flight controller and ground control stations (such as Mission Planner, QGroundControl), facilitating remote monitoring of flight status, parameter adjustment, and mission upload operations. Different telemetry devices may have different pin definitions, so it is necessary to confirm the interface definition of the telemetry module before wiring to ensure proper connection.
In general, we recommend using UART4 on the flight controller as the communication port for the telemetry module, but the specific interface may vary depending on the flight controller model.

II. Equipment Preparation

1) Flight Controller: This tutorial is applicable to any of the following flight controllers: SpeedyBee F405 WING APP / SpeedyBee F405 WING MINI / CoreWing F405 WING V2.
2) Telemetry: Using Weikong telemetry as an example.
3) Ground Control Station: Mission Planner GCS.

III. Specific Operations

1. Wiring between Flight Controller and Telemetry Module
Connect the telemetry module to UART4 on the flight controller according to the following wiring rules:

Flight Controller Port	Telemetry Module Port	Description
4V5	VCC	Power Supply (4.5V)
TX4	RX	Data Transmission (FC TX → Telemetry RX)
RX4	TX	Data Reception (FC RX ← Telemetry TX)
GND	GND	Ground

Important

✅ Important Notes：
1. RX-TX Cross Connection: The flight controller's TX needs to be connected to the telemetry module's RX, and RX to TX to avoid communication failure due to incorrect signal direction.
2. Power Supply Stability: Some telemetry modules (such as 500mW or higher power modules) may require independent power supply to avoid unstable operation due to insufficient power from the flight controller.

2. Configure Telemetry Parameters—Using Weikong Telemetry as an Example

Important

If the telemetry does not come with a ground station, consult the merchant's customer service or the relevant manual to confirm the baud rate used by the telemetry.

1. Connect the Weikong telemetry to the PC via USB, open Device Manager to check the port number (drivers need to be installed in advance).
   
   For driver installation tutorial, refer to: CP2102 Driver Installation Tutorial (Windows).
2. Open the Weikong Assistant software and follow these steps to connect:

Important

The baud rates of both the air-end and ground-end telemetry must be set to the same value!

• Select the corresponding port number for the telemetry.
• Select the baud rate, the default baud rate for Weikong telemetry is typically 57600.
• Click the Connect button.
  

Important

The interface will not change at this point. You need to click the radio icon in the toolbar to bring up the settings interface. If the connection is normal, Weikong Assistant will retrieve configuration information such as the telemetry module model.

• When opening the settings interface for the first time, you need to click 读取设置。 first.
• If you have modified the telemetry parameters, click 修改设置 to write the parameters to the module.
• 
  3. Configure Ground Control Station Parameters

1. Go to Configuration/Tuning.
2. Go to Full Parameter List.
3. Search for SERIAL4.
4. Set the value of SERIAL4_BAUD to the telemetry's baud rate.
5. Click Write Parameters.
   
   4. Verify Telemetry Functionality

Important

Connect the telemetry air-end to the flight controller and the telemetry ground-end to the computer

1. Open Mission Planner GCS, select the port used by the telemetry, select the corresponding baud rate for the telemetry, and click Connect.
2. After a successful connection, you can click Link Statistics to view the data.
   3) If you cannot establish a connection, please check the baud rate set in the telemetry ground station and the baud rate selected when connecting to Mission Planner.
   

IV. Q&A

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