HardLabs

OpenRX-Gemini

tetraethylmethane·NIDAR-RescueSwarm·pcb/OpenRX-Gemini-main/hardware/OpenRX-Gemini.kicad_pcb

OpenRX-Gemini PCB layout, top view — open source ESP32 board by tetraethylmethane
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About the OpenRX-Gemini PCB

OpenRX-Gemini is an open source ESP32 PCB design by tetraethylmethane, published on GitHub. It is a 6-layer board measuring 17 × 15.7 mm, with 85 components from 40 distinct parts.

Its main chip is the ESP32-C3, from the ESP32 family. Other key parts include the TLV75533PDQNR, LR1121IMLTRT, RFX2401C, SKY13373-460LF and TS2306A 240gf MSM 9. By type, the board carries 43 capacitors, 12 resistors, 9 ICs, 7 inductors, 4 test points and 2 connectors.

It belongs with the rf & radio, iot & wireless and wearables designs in this gallery.

From the project

Open-source dual-radio, dual-band ExpressLRS receiver for FPV aircraft. OpenRX Gemini combines an ESP32-C3 with two LR1121 radio chains and two U.FL antenna interfaces for Gemini and Xrossband operation.

Open-source dual-radio, dual-band ExpressLRS receiver for FPV aircraft. OpenRX Gemini combines an ESP32-C3 with two LR1121 radio chains and two U.FL antenna interfaces for Gemini and Xrossband operation.

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.

OpenRX-Gemini, from the project README
From the project README

Main components on the OpenRX-Gemini

ESP32-C3TLV75533PDQNRLR1121IMLTRTRFX2401CSKY13373-460LFTS2306A 240gf MSM 9

OpenRX-Gemini bill of materials (BOM)

85 components, 40 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-C3
U1
1
TLV75533PDQNR
TI
U2
2
LR1121IMLTRT
SEMTECH
U3, U6
2
RFX2401C
SKYWORKS
U4, U7
2
SKY13373-460LF
U5, U8
1
TS2306A 240gf MSM 9
TS2306A 240GF MSM 9_C2976675
SHOU HAN
U9
1
CJ17-400001010B20
JSCJ
X1
2
U.FL-R-SMT-1(80)
Conn_Coaxial_Small
HRS
J1, J2
1
2450AT18A100E
Johanson Dielectrics
AE1
2
2450FM07D0034T
JOHANSON(约翰逊)
FL1, FL2
1
OW7EL89CENUYO3YLC-32M
YXC Crystal Oscillators
OSC1
2
0900PC16J0042001E
Johanson Dielectrics
T1, T2
1
RX
TP1
1
TX
TP2
1
5V
TP3
1
GND
TP4
1
XL-1010RGBC-2812B
XL-1010RGBC-WS2812B
XINGLIGHT
D1
2
MLZ1608N100LT000
10uH
TDK
L1, L6
1
LQP03TN24NH02D
24nH
muRata
L2
1
LQP03TN2N0B02D
2.0nH
muRata
L3
Show 20 more
QtyPartRefs
1
LQP03TN2N5C02D
2.5nH
muRata
L4
2
LQW15AN47NJ00D
47nH
muRata
L5, L7
2
GRM0335C1H150JA01D
15pF
muRata
C1, C3
6
GRM0335C1H470JA01D
47p
muRata
C2, C23, C24, C39, C42, C44
8
GRM033R61A105ME44D
1uF
muRata
C4, C10, C17, C25, C27, C28, C31, C41
9
GRM033R61E104KE14D
100nF
muRata
C5, C6, C9, C12, C13, C14, C16, C35 +1
2
GRM0335C1H100FA01D
10pF
muRata
C7, C34
2
CL05A106MQ5NUNC
10uF
Samsung Electro-Mechanics
C8, C18
1
GRM155R60J106ME44D
10uF
muRata
C11
2
GRM0335C1H470JA01D
47pF
muRata
C15, C36
2
GRM033R71E222KA12D
2.2nF
muRata
C19, C33
2
GRM033R60J474KE90D
470nF
muRata
C20, C38
2
GRM0335C1E221JA01D
220pF
muRata
C21, C40
2
GRM033R71H102KA12D
1n
muRata
C22, C43
1
GRM033R61A103KA01J
10nF
muRata
C26
2
GRM0335C1H1R2BA01D
1.2pF
muRata
C29, C30
2
RC0201FR-07200RL
200
YAGEO
R1, R10
4
RC0201FR-0710KL
10k
YAGEO
R2, R3, R4, R5
2
ERJ-1GNF2200C
220
PANASONIC
R6, R9
4
RC0201FR-07100KL
100k
YAGEO
R7, R8, R11, R12

OpenRX-Gemini design files

The KiCad project lives in the tetraethylmethane/NIDAR-RescueSwarm repository on GitHub; these links point at the commit this page was built from.

OpenRX-Gemini: common questions

What microcontroller does the OpenRX-Gemini use?

The OpenRX-Gemini is built around the ESP32-C3, from the ESP32 family.

How big is the OpenRX-Gemini PCB?

The OpenRX-Gemini measures 17 × 15.7 mm, has 6 copper layers and is 1 mm thick.

How many components are on the OpenRX-Gemini?

85 components, from 40 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the OpenRX-Gemini design files?

From the tetraethylmethane/NIDAR-RescueSwarm repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the OpenRX-Gemini design in my own project?

The repository has no license, so all rights stay with tetraethylmethane. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the OpenRX-Gemini 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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