Can You Use 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 is designed primarily for high-speed digital protocols like CRSF, which offer low latency and reliable telemetry. Cheap PWM receivers typically output standard servo PWM signals, which are slow and less precise compared to ExpressLRS’s native protocol. To use ExpressLRS on a wing, you need a compatible receiver that supports ExpressLRS protocol (usually UART/serial based). If you only have a PWM receiver, you won’t be able to run ExpressLRS directly. However, you could use a flight controller that supports ExpressLRS and has PWM inputs, then configure it to translate PWM signals internally, but this adds complexity and latency.

Step-by-step advice:

  1. Buy an ExpressLRS-compatible receiver for your wing (e.g., ELRS receivers from BetaFPV, Happymodel).
  2. Bind the receiver to your ExpressLRS transmitter module.
  3. Connect the receiver to your flight controller using the correct UART pins.
  4. Configure your flight controller firmware (e.g., Betaflight, INAV) to use ExpressLRS.
  5. Test range and response before flying.

In summary, running ExpressLRS with a cheap PWM receiver isn’t practical. For best performance and reliability, invest in a proper ExpressLRS receiver.

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