OpenRX-Mono
About the OpenRX-Mono PCB
OpenRX-Mono is an open source ESP32 PCB design by OpenDrone-hw, published on GitHub under the CERN-OHL-S-2.0 license. It is a 6-layer board measuring 10 × 17.3 mm, with 61 components from 40 distinct parts.
Its main chip is the ESP32-C3FH4, from the ESP32 family. Other key parts include the TLV75533PDQNR, LR1121IMLTRT, RFX2401C and SKY13373-460LF. By type, the board carries 31 capacitors, 8 resistors, 5 ICs, 5 test points, 5 inductors and 1 crystal.
It belongs with the rf & radio, iot & wireless and wearables designs in this gallery.
From the project
Open-source dual-band ExpressLRS receiver with one LR1121 radio and one U.FL antenna.
Open-source dual-band ExpressLRS receiver for FPV aircraft. OpenRX Mono uses an ESP32-C3 and one LR1121 with a 2.4 GHz PA/LNA, sub-GHz matching network and a shared U.FL antenna interface.
Technical write-up, part list and layout constraints: AGENTS.md.
What pairs with what, and what is available: opendrone.be.
Hardware licensed under CERN-OHL-S-2.0, see LICENSE.
Main components on the OpenRX-Mono
OpenRX-Mono bill of materials (BOM)
61 components, 40 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-C3FH4 ESP32-C3 Espressif Systems | QFN-32-1EP_5x5mm_P0.5mm_EP3.7x3.7mm | U1 |
| 1 | TLV75533PDQNR TI | X2SON-4_L1.0-W1.0-P0.65-TL-EP | U2 |
| 1 | LR1121IMLTRT SEMTECH | QFN-32-1EP_5x5mm_P0.5mm_EP3.7x3.7mm | U3 |
| 1 | RFX2401C SKYWORKS | QFN-16_L3.0-W3.0-P0.50-BL-EP1.7 | U4 |
| 1 | SKY13373-460LF Skyworks Solutions | QFN-12_EP_2x2_Pitch0.5mm | U5 |
| 1 | CJ17-400001010B20 JSCJ | CRYSTAL-SMD_4P-L1.6-W1.2-BL | X1 |
| 1 | U.FL-R-SMT-1(80) Conn_Coaxial_Small HRS | U.FL_Hirose_U.FL-R-SMT-1_Vertical | J1 |
| 1 | 2450AT18A100E Johanson Dielectrics | ANT-SMD_L3.2-W1.6 | AE1 |
| 1 | 2450FM07D0034T JOHANSON(约翰逊) | FILTER-SMD_4P-L1.0-W0.5-L | FL1 |
| 1 | OW7EL89CENUYO3YLC-32M YXC Crystal Oscillators | OSC-SMD_4P-L2.0-W1.6-BL_TXC_7Z | OSC1 |
| 1 | 0900PC16J0042001E Johanson Dielectrics | FILTER-SMD_10P-L2.0-W1.6-BL | T1 |
| 1 | RX | SolderPad_1.2x2.0mm | TP1 |
| 1 | TX | SolderPad_1.2x2.0mm | TP2 |
| 1 | 5V | SolderPad_1.2x2.0mm | TP3 |
| 1 | GND | SolderPad_1.2x2.0mm | TP4 |
| 1 | BOOT | SolderPad_1.2x2.0mm | TP5 |
| 1 | XL-1010RGBC-2812B XL-1010RGBC-WS2812B XINGLIGHT | LED-SMD_4P-L1.0-W1.0-TL_XL-1010RGBC-WS2812B | D1 |
| 1 | MLZ1608N100LT000 10uH TDK | L_0603_1608Metric | L1 |
| 1 | LQP03TN24NH02D 24nH muRata | L_0201_0603Metric | L2 |
| 1 | LQP03TN2N0B02D 2.0nH muRata | L_0201_0603Metric | L3 |
Show 20 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LQP03TN2N5C02D 2.5nH muRata | L_0201_0603Metric | L4 |
| 1 | LQW15AN47NJ00D 47nH muRata | L_0402_1005Metric | L5 |
| 2 | GRM0335C1H150JA01D 15pF muRata | C_0201_0603Metric | C1, C3 |
| 3 | GRM0335C1H470JA01D 47p muRata | C_0201_0603Metric | C2, C23, C24 |
| 7 | GRM033R61A105ME44D 1uF muRata | C_0201_0603Metric | C4, C10, C17, C25, C27, C28, C31 |
| 7 | GRM033R61E104KE14D 100nF muRata | C_0201_0603Metric | C5, C6, C9, C12, C13, C14, C16 |
| 1 | GRM0335C1H100FA01D 10pF muRata | C_0201_0603Metric | C7 |
| 2 | CL05A106MQ5NUNC 10uF Samsung Electro-Mechanics | C_0402_1005Metric | C8, C18 |
| 1 | GRM155R60J106ME44D 10uF muRata | C_0402_1005Metric | C11 |
| 1 | GRM0335C1H470JA01D 47pF muRata | C_0201_0603Metric | C15 |
| 1 | GRM033R71E222KA12D 2.2nF muRata | C_0201_0603Metric | C19 |
| 1 | GRM033R60J474KE90D 470nF muRata | C_0201_0603Metric | C20 |
| 1 | GRM0335C1E221JA01D 220pF muRata | C_0201_0603Metric | C21 |
| 1 | GRM033R71H102KA12D 1n muRata | C_0201_0603Metric | C22 |
| 1 | GRM033R61A103KA01J 10nF muRata | C_0201_0603Metric | C26 |
| 2 | GRM0335C1H1R2BA01D 1.2pF muRata | C_0201_0603Metric | C29, C30 |
| 1 | RC0201FR-07200RL 200 YAGEO | R_0201_0603Metric | R1 |
| 4 | RC0201FR-0710KL 10k YAGEO | R_0201_0603Metric | R2, R3, R4, R5 |
| 1 | ERJ-1GNF2200C 220 PANASONIC | R_0201_0603Metric | R6 |
| 2 | RC0201FR-07100KL 100k YAGEO | R_0201_0603Metric | R7, R8 |
OpenRX-Mono design files
The KiCad project lives in the OpenDrone-hw/OpenRX-Mono repository on GitHub; these links point at the commit this page was built from.
- Layouthardware/OpenRX-Mono.kicad_pcb
- Schematichardware/OpenRX-Mono.kicad_sch
OpenRX-Mono: common questions
What microcontroller does the OpenRX-Mono use?
The OpenRX-Mono is built around the ESP32-C3FH4, from the ESP32 family.
How big is the OpenRX-Mono PCB?
The OpenRX-Mono measures 10 × 17.3 mm, has 6 copper layers and is 1 mm thick.
How many components are on the OpenRX-Mono?
61 components, from 40 distinct parts. The full bill of materials is listed on this page.
Where can I download the OpenRX-Mono design files?
From the OpenDrone-hw/OpenRX-Mono repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the OpenRX-Mono design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which OpenDrone-hw chose for the repository.
Can I test firmware for the OpenRX-Mono without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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