How to Set Up ExpressLRS on a Fixed Wing with PWM Outputs

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Introduction

If you're a hobby RC pilot or maker in the UK looking to upgrade your fixed wing's radio link, ExpressLRS (ELRS) is an excellent choice. It's a long-range, low-latency open-source RC system that works great for fixed wings and other models. In this guide, we'll walk you through setting up ExpressLRS on a fixed wing that uses PWM outputs, making it easy to integrate with traditional receivers and flight controllers.

What You’ll Need

  • An ExpressLRS compatible receiver with PWM outputs (e.g., the ELRS PWM receiver)
  • An ExpressLRS compatible transmitter module or transmitter with ELRS built-in
  • A fixed wing model with a flight controller or receiver that accepts PWM signals
  • A computer to flash the receiver firmware (optional but recommended)
  • Basic tools: soldering iron (if needed), wiring, connectors

Step 1: Flash Your Receiver

Before installation, ensure your ExpressLRS receiver is running the latest firmware. Download the ExpressLRS Configurator from the official site. Connect your receiver to your computer via USB or a suitable interface and flash the firmware suited for your hardware and frequency band (e.g., 2.4GHz or 900MHz).

This step is crucial because it configures the receiver to communicate correctly with your transmitter and optimises performance.

Step 2: Wiring the Receiver to Your Flight Controller

ExpressLRS receivers with PWM outputs provide individual servo-style PWM signals for each channel. These outputs are usually labelled as CH1, CH2, CH3, etc. Here's how to wire them:

  • Power: Connect the receiver's 5V and GND pins to your flight controller or battery (check voltage specs).
  • Signal: Connect each PWM output channel to the corresponding PWM input on your flight controller or directly to servos/ESCs if no flight controller is used.

Double-check polarity and make sure your receiver's power source matches your fixed wing's power system to avoid damage.

Step 3: Bind the Receiver to Your Transmitter

To establish a link between your receiver and transmitter:

  • Power on your ELRS transmitter module or ELRS-equipped radio.
  • Put your receiver into bind mode (usually by holding a button while powering it up; check your receiver manual).
  • Use the ExpressLRS Configurator or your transmitter to initiate binding.
  • Once the receiver LED indicates a successful bind (steady light), power cycle to confirm the connection.

Step 4: Testing and Calibration

Before your first flight, test each channel to ensure correct response:

  • Move sticks on your transmitter and observe the PWM outputs with a servo tester or on your flight controller's input monitoring tool.
  • Check throttle, aileron, elevator, rudder, and any additional channels for proper movement and direction.
  • Adjust reverses and end-points in your transmitter settings if necessary.

Tips for UK Hobbyists

  • Ensure your frequency band and power settings comply with UK regulations (generally 2.4GHz or 868MHz for ELRS).
  • Use a quality antenna and position it away from carbon fibre or metal parts to maximise signal range.
  • Keep firmware updated for best performance and security.

Conclusion

Setting up ExpressLRS on a fixed wing with PWM outputs is straightforward and rewarding. It gives you a robust radio link with excellent range and low latency, perfect for the UK skies. With this guide, your fixed wing will be ready to fly with ELRS in no time. Happy flying!

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