HGLRC ELRS 2.4GHz ExpressLRS RX Nano Module User Manual

1. Introduction

This manual provides detailed instructions for the HGLRC ELRS 2.4GHz ExpressLRS RX Nano Module. It covers product features, specifications, installation, operation, and troubleshooting to ensure optimal performance and safe use with FPV RC Quadcopter Racing Drones.

Figure 1: HGLRC ELRS 2.4GHz ExpressLRS RX Nano Module

2. Safety Information

Always follow these safety guidelines during installation and operation:

• Ensure all connections are correct before powering on the device.
• Avoid short circuits during soldering or wiring.
• Operate the module within its specified voltage range.
• Keep the module away from moisture and extreme temperatures.
• Refer to the flight controller's manual for compatible wiring and setup procedures.

3. Product Features

• Dual Installation: Solderable and plug-in options for flexible installation and detachment.
• High Refresh Rate: Ensures minimal latency and enhanced responsiveness for a smoother and more reliable control experience.
• Durable Construction: Designed to withstand the rigors of various environments, ensuring long-lasting performance.
• Compact Design: Space-efficient form factor for constrained installations without performance compromise.
• Wide Compatibility: Compatible with various systems, easily integrated into different settings to meet diverse user needs.

Figure 2: Compact design of the ELRS receiver (11.18 x 12.45mm)

4. Product Specifications

Figure 3: Detailed specifications of the ELRS Receiver

5. Product Components (Packing List)

The package includes the following items:

• HGLRC ELRS 2.4GHz ExpressLRS RX Nano Module
• Omni-directional antenna
• Connection wires

Figure 4: Contents of the product package

6. Installation and Wiring

6.1 Installation Options

The ELRS Nano Module offers both solderable and direct plug-in installation methods, providing flexibility for various setups.

Figure 5: Illustration of solderable and pluggable installation

6.2 Wiring Diagram

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

Figure 6: Standard wiring diagram for the ELRS receiver

7. Binding and Operation

7.1 Binding Procedure

To bind the receiver with your transmitter module:

1. Power on the receiver three times quickly. After the third power-on, the LED light on the receiver will flash at intervals of 1.5 seconds and then flash twice, indicating it is in binding mode.
2. On your remote control, turn on the ELRS Lua script and click the BIND button to initiate the binding process.

Figure 7: Example of ELRS binding screen on a transmitter

8. Firmware Flashing

Firmware updates can be performed via Wi-Fi mode or by connecting to the ground station through the flight controller.

8.1 Wi-Fi Wireless Flashing

1. Prepare the firmware first.
2. Enter the receiver into Wi-Fi mode.
3. Use a mobile phone or computer to connect to the receiver's Wi-Fi network (name: ExpressLRS RX, password: expresslrs).
4. After connecting, it will automatically jump to the flashing interface. If it does not, enter 10.0.0.1 in your browser address bar to access the flashing interface.
5. Select the prepared firmware file and flash.

8.2 Wired Flashing

Connect the receiver to the flight controller, set the port and protocol, then turn on the ELRS ground station. Select the corresponding brand and model, and then flash the firmware.

9. Troubleshooting (Frequently Asked Questions)

9.1 Which brands of TX module can the HGLRC elrs2.4g receiver pair with?

ELRS is an open-source project. Any brand can be linked, provided the following three conditions are met:

1. The receiver and TX module are both 2.4G or 915MHz.
2. The firmware version of the receiver is consistent with the firmware version of the TX module (e.g., 2.x matches 2.x, and 3.x matches 3.x).
3. There is no password for linking, or the same password is set. Our receivers leave the factory with 3.0 firmware without a password.

9.2 How to link the receiver and TX module?

The receiver is powered on and off three times quickly. After the third power-on, the LED light of the receiver circulates at intervals of 1.5 seconds and flashes twice to indicate that the receiver enters the frequency binding mode. Turn on the remote control, enter the ELRS Lua script of the remote control, and click BIND to link frequency.

9.3 After the receiver is powered on, why is it always on without frequency binding?

When the receiver is connected to the TX and RX ports on the flight controller abnormally, it can lead to the LED being always on. At this time, you can replace a TX and RX port for testing, or check whether the line sequence is correct. The correct connection should be that the TX of the receiver is connected to the flight controller's RX, and RX is connected to TX (TX is the transmitting port, RX is the receiving port).

9.4 Does the LED light flash quickly when the receiver is left standing for a while?

The receiver will automatically enter the Wi-Fi mode if it does not receive a signal from the remote control for about 30 seconds after it is powered on, and it will exit this mode when it is powered on again.

10. Maintenance

To ensure the longevity and reliable performance of your HGLRC ELRS 2.4GHz ExpressLRS RX Nano Module, consider the following maintenance tips:

• Keep Clean: Regularly inspect the module for dust or debris and gently clean with a soft, dry brush if necessary. Avoid using liquids.
• Protect from Impact: Ensure the module is securely mounted within your drone to prevent damage from crashes or vibrations.
• Antenna Care: Handle the antenna carefully to avoid bending or breaking. A damaged antenna can significantly reduce range and signal quality.
• Storage: When not in use, store the module in a dry, cool environment, away from direct sunlight and static electricity.

11. Official Product Videos

No official product videos directly related to the HGLRC ELRS 2.4GHz ExpressLRS RX Nano Module from the manufacturer were found in the provided data. Videos from other brands or for related flight controllers are not included to maintain product-specific relevance.