1. Introduction
Welcome to the iFlight Borg Series! This manual provides detailed instructions for the setup, operation, and maintenance of your Borg 5S RX Flight Controller. The Borg 5S RX FC is specifically designed for racing FPV applications, offering unmatched performance and reliability.
Key Features:
- Built-in ELRS 2.4GHz Receiver with integrated antenna for reliable connection.
- Compatibility with external antennas for enhanced flexibility.
- Supports 3S to 8S LIHV battery inputs, providing versatility for various racing setups.
- Integrated 12V BEC for stable power to your VTX system, allowing remote control VTX switching.
- FPC cables for secure connections with ESCs.
- SH1.0 connectors for enhanced reliability across all other interfaces.
2. Specifications
| Parameter | Value |
|---|---|
| Input Voltage | 4-8S (Support LIHV battery) |
| MCU | AT32F435RGT7 |
| Gyro | ICM42688 |
| Barometer | N/A |
| OSD Chip | AT7456E |
| Flash | 16MB (Blackbox flash) |
| UARTs | 4 |
| Motor Outputs | 4 |
| I2C Serial | Non support |
| VTX Protocol | Support DJI MSP/Smartaudio/IRCTramp/HDZero |
| LED Controller | Yes |
| Beeper Pad | Yes |
| Firmware Target | IFLIGHT_BLITZ_ATF435 (Betaflight) |
| Mount Pattern | 20x20mm (φ4 holes) |
| Dimensions | 34x27mm ±1 |
| Weight | 6.8g ±1 |
| BEC | 5V 2.5A, 12V 2A (12V with VTX switch) |
| High-concerned chemical | None |
| Is Electric | No Battery |
| Is Batteries Included | No |
3. Package Contents
The following items are included in your package:
- 1 x Borg 5S RX Flight Controller
- 1 x Cables set
- 5 x Silicon grommets
4. Setup and Wiring
Careful wiring is crucial for the proper function of your flight controller. Refer to the detailed wiring diagram below for all connections. Ensure all connections are secure and correctly polarized.
4.1. Wiring Suggestions
- UART 1: For VTX (HD / Analog)
- UART 2: For ESC Telemetry
- UART 4: For Built-in ELRS receiver or SBUS input
- UART 5: For GPS or other sensors requiring a serial port
4.2. Connecting Digital Transmitters (DJI O3 Air Unit / DJI Vista)
Connect your DJI O3 Air Unit or DJI Vista to the flight controller as follows:
- GND: Ground
- 9V: 9 Volt Power
- TX1: Transmit Data (to Air Unit/Vista RX)
- RX1: Receive Data (from Air Unit/Vista TX)
Note: If using an ESC from another brand, please consult the ESC's specific wiring diagram.
4.3. Connecting Other Receivers
If you are using an external receiver instead of the built-in ELRS, connect it to the flight controller as follows:
- GND: Ground
- 5V: 5 Volt Power
- RX4: Receive Data
Important: If using an external receiver, you must disable the built-in ELRS receiver in Betaflight CLI. Type resource SERIAL_RX 4 NONE and then save.
4.4. Connecting LED and Buzzer
- LED: Connect to FC's GND, 5V, and LED pads.
- Buzzer: Connect to FC's GND and BZ- pads.
4.5. Connecting ESC (4-in-1)
Connect your 4-in-1 ESC to the flight controller using the provided FPC cables or by soldering to the pads:
- GND: Ground
- BAT: Battery Voltage
- M1, M2, M3, M4: Motor Signals
- CUR: Current Sensor
- TLM: Telemetry
- RX2: Receive Data (for ESC Telemetry)
Note: If using an ESC from another brand, please consult the ESC's specific wiring diagram.
4.6. Connecting VTX and Camera
- Analog VTX: Connect to FC's GND, 12V, and VTX pads.
- Camera: Connect to FC's GND, 5V, and CAM pads.
4.7. Connecting GPS Module
Connect your GPS module to the flight controller as follows:
- GND: Ground
- 5V: 5 Volt Power
- TX5: Transmit Data (to GPS RX)
- RX5: Receive Data (from GPS TX)
Note: GPS/RX5 pads cannot be remapped to UART1.
4.8. Mounting Pattern
The Borg 5S RX Flight Controller features a 20x20mm mounting pattern with M4 holes. Ensure proper isolation and secure mounting within your FPV frame.
5. Operating Instructions
5.1. Initial Configuration (Betaflight)
- Connect the flight controller to your computer via the USB-C port.
- Open the Betaflight Configurator software.
- Ensure the correct firmware target (IFLIGHT_BLITZ_ATF435) is selected and flash the latest stable Betaflight firmware.
- Perform initial setup steps including accelerometer calibration, port configuration (based on your wiring), receiver setup (ELRS binding or external receiver configuration), and mode assignments.
- Verify motor direction and ESC protocol settings.
- Save and reboot the flight controller.
5.2. ELRS Binding (Built-in Receiver)
To bind the built-in ELRS 2.4GHz receiver to your ELRS transmitter module:
- Power on the flight controller three times, waiting for the LED to flash slowly between each power cycle. On the third power cycle, the LED should flash rapidly, indicating binding mode.
- Activate binding mode on your ELRS transmitter module.
- Once bound, the receiver LED on the flight controller will become solid.
5.3. VTX Control
The integrated 12V BEC allows for VTX power switching via your remote control. Configure a switch in Betaflight to control the VTX power output as needed.
6. Maintenance
- Regular Inspection: Periodically check all solder joints and connections for signs of wear, corrosion, or damage.
- Cleaning: Keep the flight controller free from dust, dirt, and debris. Use a soft brush or compressed air for cleaning. Avoid using liquids directly on the board.
- Firmware Updates: Regularly check for and apply the latest Betaflight firmware updates to ensure optimal performance and access to new features.
- Physical Protection: Ensure the flight controller is adequately protected within your drone frame to prevent damage from crashes or impacts.
7. Troubleshooting
- No Power: Double-check battery connections and ensure the input voltage is within the 4-8S range. Inspect for any short circuits.
- No Receiver Signal: Verify ELRS binding procedure. If using an external receiver, ensure the built-in ELRS is disabled in Betaflight CLI and the external receiver is correctly wired and configured.
- Motors Not Spinning: Check ESC connections, motor direction in Betaflight, and ESC protocol settings. Ensure motors are armed correctly.
- OSD Issues: Confirm OSD chip (AT7456E) is recognized in Betaflight. Check VTX and camera connections.
- Flight Instability: Re-calibrate accelerometer. Check for loose components or vibrations affecting the gyro. Review PID settings in Betaflight.
- USB Connection Problems: Try a different USB-C cable or port. Ensure Betaflight Configurator is up-to-date.
8. User Tips
- Always perform a dry run and bench test after any wiring changes or firmware updates before actual flight.
- Utilize the Blackbox feature (16MB flash) to log flight data for tuning and troubleshooting.
- Consider using conformal coating on the FC for added protection against moisture and dust, especially in outdoor environments.
- For optimal performance, ensure your ELRS transmitter module and receiver firmware versions are compatible.
9. Warranty and Support
For warranty claims, technical support, or further assistance, please contact the IFLIGHT Official Store or refer to their official website. Keep your proof of purchase for any warranty-related inquiries.