HPXGRC 2.4G ExpressLRS ELRS Receiver Instruction Manual

1. Product Overview

The HPXGRC 2.4G ExpressLRS (ELRS) Receiver is a compact and high-performance receiver designed for FPV (First Person View) freestyle and long-range drone applications. Utilizing the ExpressLRS protocol, it offers reliable control and telemetry capabilities for your DIY drone projects.

2. Specifications

Below are the detailed technical specifications for the HPXGRC ELRS 2.4G Receiver:

3. Packing List

The product package includes the following items:

• 1 x HPXGRC ELRS 2.4G Receiver
• 1 x Heat Shrink Tubing
• 4 x Connection Wires
• 1 x T-Antenna

4. Setup Instructions

4.1 Wiring Diagram

Connect the receiver to your flight controller according to the following diagram. Ensure correct polarity and pin assignments (TX, RX, 5V, GND).

4.2 Firmware and Binding

1. Install Antenna: Carefully connect the provided T-antenna to the IPEX1 connector on the receiver.
2. Power Up: Connect the receiver to your flight controller, ensuring the flight controller is powered.
3. Firmware Flashing (if necessary): If your receiver's firmware is not compatible with your transmitter module, you may need to flash the appropriate ExpressLRS firmware. This typically involves connecting the receiver to a computer via a UART connection on the flight controller or a dedicated ELRS flasher, and using the ExpressLRS Configurator software. Refer to the official ExpressLRS documentation for detailed flashing procedures.
4. Binding Procedure:
   • Power on your receiver three times in quick succession (power cycle). The LED on the receiver should flash rapidly, indicating it is in binding mode.
   • On your ExpressLRS compatible transmitter module, initiate the binding process. This is usually done through the Lua script or a dedicated bind button.
   • Once bound, the LED on the receiver should turn solid, indicating a successful connection.

5. Operating Instructions

Once the receiver is successfully installed and bound, it will operate automatically when powered on and within range of your ExpressLRS transmitter.

• Control Signal Reception: The receiver will continuously receive control signals from your transmitter, translating your stick inputs into commands for the flight controller.
• Telemetry Output: The receiver provides 100mW telemetry output, allowing your transmitter to receive real-time data from your drone (e.g., battery voltage, RSSI, link quality). Ensure your flight controller and transmitter are configured to utilize this telemetry data.
• Refresh Rate: The receiver supports refresh rates from 25Hz to 500Hz, with D1000Hz mode available for ultra-low latency applications. The actual refresh rate will depend on your transmitter's configuration.

6. Maintenance

Proper maintenance ensures the longevity and reliable performance of your ELRS receiver:

• Keep Dry: Avoid exposing the receiver to moisture or liquids. If it gets wet, disconnect power immediately and allow it to dry completely before re-applying power.
• Protect from Impact: While the receiver is small, physical impact can damage internal components. Use the provided heat shrink tubing for protection and mount it securely within your drone.
• Inspect Connections: Regularly check all wiring connections for looseness or damage. Ensure the antenna is securely attached to the IPEX1 connector.
• Cleanliness: Keep the receiver free from dust, dirt, and debris, which can interfere with its operation.
• Temperature: Avoid operating or storing the receiver in extreme temperatures.

7. Troubleshooting

If you encounter issues with your HPXGRC ELRS receiver, consider the following troubleshooting steps:

• No LED Activity:
  • Check power connections (5V and GND) to ensure the receiver is receiving power.
  • Verify the flight controller is powered on.
• Receiver Not Binding:
  • Ensure your transmitter module is also in binding mode.
  • Confirm that the receiver and transmitter are running compatible ExpressLRS firmware versions.
  • Check the binding phrase (if used) on both the receiver and transmitter.
  • Try power cycling the receiver three times rapidly to enter binding mode.
• Poor Range/Signal Loss:
  • Ensure the antenna is correctly installed and not damaged.
  • Check for obstructions or interference between the drone and the transmitter.
  • Verify the transmitter power output settings.
  • Ensure the antenna is positioned optimally, away from carbon fiber or other conductive materials.
• No Control Input:
  • Confirm successful binding (solid LED on receiver).
  • Check UART connections (TX/RX) between the receiver and flight controller.
  • Verify flight controller configuration (e.g., UART selected for serial receiver, CRSF/SBUS protocol selected).

8. User Tips

This section typically contains helpful advice and common solutions gathered from user experiences and frequently asked questions. As no specific user reviews or Q&A data were provided, here are some general tips for ELRS receivers:

• Antenna Placement: Always ensure your receiver's antenna is mounted away from carbon fiber frames and other electronics to maximize signal reception and range. Using zip ties or heat shrink to secure the antenna elements can prevent damage.
• Firmware Updates: Regularly check the official ExpressLRS project for the latest firmware updates. These often include performance improvements, bug fixes, and new features. Always update both your receiver and transmitter module to the same major firmware version for compatibility.
• Binding Phrase: For convenience and security, consider setting a unique binding phrase in the ExpressLRS Configurator for both your receiver and transmitter. This allows for automatic binding without needing to manually enter bind mode.
• Heat Shrink Protection: Utilize the provided heat shrink tubing to protect the receiver board from short circuits, dust, and minor impacts.

9. Warranty and Support

For warranty claims, technical support, or further assistance, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.

For general information and community support regarding ExpressLRS, visit the official ExpressLRS project website and community forums.