OpenRX
OpenRX is the home of the OpenDrone open-source ExpressLRS receiver family. The four boards now follow the same one-board-per-repository standard as the rest of the OpenDrone hardware line. This repository remains open as the family hub, preserving its stars, issues, releases, tags, and complete history.
Board repositories
| Board | Radio and antenna | Source and releases |
|---|---|---|
| OpenRX Lite | SX1281, 2.4 GHz, on-board ceramic | OpenDrone-hw/OpenRX-Lite |
| OpenRX Lite-UFL | SX1281, 2.4 GHz, U.FL | OpenDrone-hw/OpenRX-Lite-UFL |
| OpenRX Mono | LR1121, dual band, one U.FL | OpenDrone-hw/OpenRX-Mono |
| OpenRX Gemini | Two LR1121 radios, dual band, two U.FL | OpenDrone-hw/OpenRX-Gemini |
KiCad sources, firmware target definitions, board documentation, and future releases live in those repositories. The family-level Rev 2 and Rev 2.1 tags and releases remain here as the immutable record of the original combined repository; their per-board assets are also available from each board repo.
Specifications
| Lite | Lite-UFL | Mono | Gemini | |
|---|---|---|---|---|
| Band | 2.4 GHz | 2.4 GHz | Dual band | Dual band, Xrossband |
| Radio | SX1281 | SX1281 | LR1121 | 2x LR1121 |
| Antenna | On-board ceramic | U.FL | U.FL | 2x U.FL |
| Telemetry power | 13 dBm (20 mW) | 13 dBm (20 mW) | Up to 22 dBm (158 mW) | Up to 22 dBm (158 mW) |
| Protocol | CRSF | CRSF | CRSF | CRSF |
| MCU | ESP32-C3 | ESP32-C3 | ESP32-C3 | ESP32-C3 |
| Input | 5 V pad | 5 V pad | 5 V pad | 5 V pad |
| Firmware | ExpressLRS | ExpressLRS | ExpressLRS | ExpressLRS |
| Flashing | Betaflight passthrough or Wi-Fi | Betaflight passthrough or Wi-Fi | Betaflight passthrough or Wi-Fi | Betaflight passthrough or Wi-Fi |
| Dimensions | 10.0 x 11.5 mm | 10.0 x 11.5 mm | 10.0 x 17.3 mm | 17.0 x 15.7 mm |
| PCB | 6-layer, 1.0 mm | 6-layer, 1.0 mm | 6-layer, 1.0 mm | 6-layer, 1.0 mm |
OSHWA certification is issued per board: Lite BE000030, Lite-UFL BE000031, Mono BE000032, and Gemini BE000033.
In the line
What pairs with what, and what is available: opendrone.be.
Contributing
Choose the board repository above for hardware changes. Family-wide questions and historical discussion remain welcome here. See CONTRIBUTING.md.
License
Hardware licensed under CERN-OHL-S-2.0, see LICENSE.