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File 03 · ELRS Receiver
An ExpressLRS receiver, open from antenna to firmware.
Four board designs, one firmware. Lite runs SX1281 on 2.4 GHz with a ceramic antenna. Lite-UFL swaps to a U.FL pigtail. Mono steps up to a single LR1121 for multi-band. Gemini runs dual LR1121 in ExpressLRS Xrossband mode for frequency-diverse links.
OSHWA certified · BE000030Model· pick your build
Coming soonSKU OPENRX-LITE
Teardown
- SX1281 · 2.4 GHz LoRa radio×1
- ESP32-C3 · Wi-Fi MCU×1
- 2.4 GHz SAW band-pass filter×1
- ELRS link antenna (Molex 47948)×1
- Wi-Fi antenna (ESP32-C3)×1
- 52 MHz radio TCXO×1
- TLV75533 · 3.3 V LDO×1
- Solder pad I/O · CRSF UART×1
Published so you can study it. Produced so you don't have to.
In the box
- 1×OpenRX boardtier selected at checkout
- 1×CRSF servo cable3-pin JST-SH1.0, pre-crimped, 10 cm
- 1×Heat-shrink sleeve + double-sided tape
- 1×Build cardbatch ID, QC initials, ExpressLRS flash target, GitHub rev
Provenance
- DesignedLeuven, Belgium · schematic, PCB, BOM, firmware partnerships
- AssembledShenzhen, China · first runs, while we bring up an EU line
- NextEU assembly · in planning
Every spec, one table
- Firmware
- ExpressLRS (3.5.0+)
- Telemetry
- CRSF
- MCU
- ESP32-C3, 4 MB flash
- Wi-Fi antenna
- Dedicated on-board ceramic, separate from the link antenna
- Flashing
- UART first, then Wi-Fi OTA / BF passthrough
- License
- CERN-OHL-S-2.0
- Radio
- Semtech SX1281, 2.4 GHz
- Flash target
- Unified_ESP32C3_2400_RX
- Telemetry power
- 13 dBm (~20 mW)
- Antenna
- On-board ceramic chip, no antenna wire to tear off
- Size
- 10.05 × 10.55 mm, 6-layer
Files you can fork, build on, or audit.
Straight from the repo. If a link 404s, the file moved; open an issue on the matching GitHub repo and we'll point it back.
Manufacturer
- Company
- Incutec BV
- Address
- Stapelhuisstraat 15, 3000 Leuven, Belgium
- contact@opendrone.be
