Mini ELRS 2.4G Receiver Instruction Manual

1. Introduction

The CYCLONE series receivers are built upon the open-source ExpressLRS architecture and programs, offering high performance for RC FPV drones. This manual covers three types of RX receiver modules: ELRS EP1 2.4G, ELRS EP2 2.4G, and ELRS 2.4G NANO. All models utilize the ESP8285 MCU, allowing for convenient firmware upgrades via Wi-Fi.

A key feature is the ability to upgrade firmware wirelessly. After powering the receiver and turning off the remote control, the receiver will create a Wi-Fi hotspot (named "ExpressLRS") after approximately 60 seconds. Connect to this hotspot using a computer or mobile phone (password: expresslrs), then navigate to 10.0.0.1 in a web browser to upload the new firmware.

2. Specifications

Below are the detailed specifications for each ELRS 2.4G receiver module:

3. Product Differences

• ELRS 2.4G NANO Receiver: This receiver includes a power amplifier (PA+LNA), providing 100mW telemetry output and enhanced sensitivity for longer distances. It features an IPEX Gen 1 antenna base and is designed for use with an external dipole T-type antenna. Its low latency and high refresh rate make it ideal for FPV competition and remote FPV applications, offering ultra-light and ultra-small dimensions.
• ELRS EP1 2.4G Receiver: The EP1 receiver does not have a PA/LNA, meaning its telemetry power is 17mW, consistent with the SX1280 RF chip. It utilizes a high-efficiency pagoda ceramic antenna, optimized for efficient signal reception in confined spaces.
• ELRS EP2 2.4G Receiver: Similar to the EP1, the EP2 receiver also lacks a PA/LNA, resulting in a telemetry power of 17mW. It features an IPEX 1st generation antenna base and is designed for use with a dipole Sub-T antenna.

4. Setup: Binding Procedure

Follow these steps to bind your ELRS receiver to your remote control:

1. Prepare the Receiver for Binding:

   Connect the receiver to your flight controller. Power the flight controller by connecting a USB cable. For the first power cycle, insert the USB, and as soon as the LED light on the receiver turns off, disconnect the USB. Repeat this operation once more. When you plug in the USB for the third time, the receiver's LED will begin to flash twice, indicating it is in pairing mode.

   

   

   

2. Initiate Binding from Remote Control:

   Ensure your ES24TX module or DIY 2.4G ELRS tuner module is correctly connected to your remote control. Copy the ELRS.LUA file to the SD card in your remote control (typically in the SD Card/Scripts/tools directory). Then, run the ELRS.LUA script to perform the bind operation.

3. Verify Successful Binding:

   Upon successful binding, the LED on the receiver will remain steadily lit. You should also be able to receive telemetry signals from the receiver.

5. Operating: Receiver LED Status

Understanding the LED indicators on your receiver is crucial for operation and troubleshooting:

• Solid ON: The receiver is successfully paired with the transmitter, and communication is normal.
• Double Flashing: The receiver is in frequency pairing (binding) mode, awaiting a bind signal from the transmitter.
• Slow Flashing: The receiver cannot detect or receive a signal from the transmitter. This indicates a loss of connection or an unsuccessful bind.

6. Maintenance

To ensure the longevity and optimal performance of your ELRS receiver, consider the following maintenance tips:

• Keep Clean: Regularly inspect the receiver for dust, dirt, or debris. Use a soft brush or compressed air to gently clean the board.
• Protect from Elements: Avoid exposing the receiver to moisture, extreme temperatures, or direct sunlight. Consider using heat shrink tubing or a protective case for added durability, especially in FPV drone applications.
• Secure Connections: Ensure all wiring connections (TX, RX, VCC, GND) are secure and properly soldered. Loose connections can lead to intermittent signal loss.
• Antenna Care: Handle antennas carefully. Avoid bending or crimping them excessively, as this can damage the internal wiring and reduce signal quality. Ensure the antenna is mounted in a way that minimizes interference and maximizes signal reception.
• Firmware Updates: Periodically check for new firmware releases for ExpressLRS. Updating your receiver's firmware can provide performance improvements, bug fixes, and new features.

7. Troubleshooting

If you encounter issues with your ELRS receiver, refer to the following troubleshooting guide:

• Receiver LED is Slow Flashing:
  • This indicates the receiver is not receiving a signal from the transmitter.
  • Check Binding: Re-attempt the binding procedure (Section 4). Ensure your remote control is correctly configured and transmitting.
  • Transmitter Power: Verify your transmitter module is powered on and operating correctly.
  • Range: Ensure the receiver and transmitter are within operational range.
  • Antenna Connection: Check that the receiver's antenna is securely connected and undamaged.
  • Firmware Mismatch: Ensure both your receiver and transmitter module are running compatible ExpressLRS firmware versions.
• Receiver LED is Double Flashing but Not Binding:
  • The receiver is in binding mode but not completing the bind.
  • Remote Control Setup: Double-check that the ELRS.LUA script is running correctly on your remote control and that the bind command is being sent.
  • Proximity: Bring the receiver closer to the transmitter during the binding process.
  • Interference: Temporarily move away from potential sources of 2.4GHz interference (e.g., Wi-Fi routers, other RC equipment).
• No Telemetry Signal:
  • If the receiver LED is solid but no telemetry is received, check your flight controller's UART configuration for CRSF protocol.
  • Ensure the TX/RX wires from the receiver are connected to the correct UART on the flight controller.
• Receiver Not Powering On:
  • Verify the 5V and GND connections from the flight controller to the receiver are correct and providing power.
  • Inspect for any visible damage to the receiver board or solder joints.

8. User Tips

• Antenna Placement: For optimal range and signal quality, ensure your receiver antenna is mounted away from carbon fiber frames and other electronic components that might block or interfere with the signal.
• Heat Shrink Protection: After soldering and testing, consider using clear heat shrink tubing over your receiver to protect it from short circuits, dust, and minor impacts.
• Regular Firmware Checks: The ExpressLRS project is actively developed. Regularly check the official ExpressLRS GitHub repository or community forums for the latest firmware updates and flashing instructions.
• Binding Phrase: For advanced users, setting a unique binding phrase in your ExpressLRS firmware can simplify future binding processes across multiple receivers and transmitters.

9. Warranty and Support

This product is covered by the standard manufacturer's warranty against defects in materials and workmanship. For technical support, troubleshooting assistance, or warranty claims, please contact your retailer or the manufacturer directly. Keep your proof of purchase for warranty validation.

For the latest information, firmware, and community support, please refer to the official ExpressLRS project documentation and community channels.