Using ExpressLRS with a Cheap PWM Receiver on a Wing

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Question: Can I run ExpressLRS with a cheap PWM receiver on a wing?

Answer: ExpressLRS (ELRS) is designed primarily for digital communication via dedicated ELRS receivers, which use a fast, low-latency protocol over serial or SPI interfaces, not PWM. While you can connect a cheap PWM receiver to your flight controller alongside an ELRS module or receiver, you can’t run ELRS directly on a standard cheap PWM receiver. If your wing's flight controller supports ELRS, it’s best to use a compatible ELRS receiver to get the full benefits of range, latency, and reliability.

For a practical setup:

  1. Install an ELRS receiver compatible with your flight controller and bind it to your ELRS transmitter module.
  2. Connect the ELRS receiver via CRSF or SPI, depending on your hardware.
  3. If you have a cheap PWM receiver, you can use it as a backup or for basic control, but it won’t run ELRS protocol.
  4. Ensure your flight controller firmware is configured to use ELRS input.

This approach gives you the best performance and reliability for your wing’s control system.

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