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Custom JR Bay Transmitter

Now you saw two communication protocols: UDP and the good old receivers. I was planning to make a custom JR bay transmitter that uses ESP-NOW. It uses the radio chip of ESP32 but with a modulation similar to LoRa modulation, as used by ExpressLRS (ELRS), to obtain higher ranges.

In this guide, we will explore creating a custom JR bay transmitter using ESP32 that leverages the ESP32’s radio chip and utilizes LoRa-like modulation for achieving higher communication ranges. This approach combines the flexibility of ESP-NOW with long-range communication, making it ideal for robust control systems.

1. ESP-NOW Communication Protocol

ESP-NOW is a wireless communication protocol by Espressif that allows for fast, low-power, peer-to-peer communication without the need for Wi-Fi. It's an excellent base protocol for real-time control systems like custom JR bay transmitters.

ESP-NOW Documentation:

ESP-NOW Library for Arduino:

  • I have developed a library for ESP-NOW specifically for Arduino that simplifies the integration of this protocol into your projects:

2. Using LoRa-Like Modulation with ESP32

The ESP32 supports modulation techniques that can be adapted to work similarly to LoRa for increasing the communication range. By modifying the existing communication protocols like ESP-NOW and adding modulation features, we can achieve longer ranges similar to the ELRS system.

Steps:

  • Implement LoRa-like modulation with the ESP32 radio chip by adjusting the bandwidth and spreading factor settings.
  • Modify the communication protocol to accommodate long-range transmission with minimal interference, inspired by ELRS modulation techniques.

3. JR Bay Module with EdgeTX

To integrate your custom transmitter into the RC world, it must be compatible with JR bay systems, which are commonly used in radios like EdgeTX.

EdgeTX Documentation for JR Bay Modules:

EdgeTX provides extensive support for JR bay modules, which can help you design a compatible system that works seamlessly with your custom ESP32-based JR bay transmitter.

Summary

By combining ESP-NOW with LoRa-like modulation and integrating it into a custom JR bay transmitter, you can create a powerful and flexible long-range communication system. The transmitter will leverage the ESP32’s radio chip and be compatible with EdgeTX-based radios, offering a customizable and open-source solution for RC enthusiasts.