4 layers30 × 23.5 mm
NIMRS-21Pin Decoder
CDFER/NIMRS-21Pin-Decoder
An open source 21-Pin DCC Decoder for model trains
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Raiden s01
RaidenTechnology/raiden-s01Open-hardware ESP32-S3 development board — 4-layer, USB-C, U.FL antenna. KiCad 9, CERN-OHL-P.
- Size
- 36 × 60 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 57
- Pads
- 215
- Tracks, vias
- 718, 121
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Jul 2026
- Updated
- 21 Aug 2026
Overview
Raiden s01 is an open-source printed circuit board by RaidenTechnology, from the RaidenTechnology/raiden-s01 repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 4-layer board of 36 × 60 mm with 46 parts on 57 nets, routed with 718 tracks and 121 vias.
It is built around the ESP32-S3FN8 and PRTR5V0U2X. Its parts include 18 capacitors, 7 resistors, 6 connectors, 2 ICs and 2 diodes. It belongs with the radio and wireless boards and the ESP32 boards of this library.
Main components
2
ESP32-S3FN8
QFN-56-EP(7x7)Watchdog reset、Software reset、Built-in general-purpose timer、Built-in temperature sensor、Touch function、True random number generator (TRNG)、Storage encryption、Infrared remote control QFN-56-EP(7x7) Microcontrollers (MCU/MPU/SOC) ROHSEspressif SystemsMicrocontrollers (MCU/MPU/SOC)
PRTR5V0U2X
SOT-143-55℃~+125℃ 0.3pF、0.8pF 100W 10V、15V 5V 6.5V 6A 80nA ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Three channels Unidirectional SOT-143 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
README
README.mdRaiden S0-1
Open-hardware ESP32-S3 development board — designed from scratch in KiCad 9.
Overview
The Raiden S0-1 is a compact 4-layer devkit built around the ESP32-S3FN8 (dual-core Xtensa LX7 @ 240 MHz, Wi-Fi + BLE 5, 8 MB embedded flash). Designed, routed and verified entirely by Raiden Technology.
| MCU | ESP32-S3FN8 (QFN-56, 8 MB flash) |
| USB | USB-C (USB 2.0), ESD-protected (PRTR5V0U2X), 5.1 kΩ CC pull-downs |
| Power | AZ1117C-3.3 LDO, 750 mA PTC resettable fuse, power LED |
| RF | U.FL (IPEX) antenna connector, feed line drawn for 50 Ω single-ended with a pi matching network — see the note below, impedance is not verified |
| Clocks | 40 MHz main crystal (CL = 8 pF) · 32.768 kHz RTC crystal (CL = 12.5 pF) |
| I/O | 2 × 15-pin 2.54 mm headers, BOOT + RESET buttons |
| Board | 4-layer FR-4, 1.6 mm — Sig / GND / +3V3 / Sig stackup, black soldermask |
| Mounting | 4 × M2 holes (NPTH) |
Board views
| Top | Bottom |
|---|---|
 |  |
Verification
- ERC: 0 errors — DRC: 0 errors, 0 unconnected items (KiCad 9.0.7,
kicad-cli) - 5 permanent DRC notices are intentional local footprint overrides (U.FL RF keepout + M2 mounting holes)
Known limitations
- The RF feed is not impedance-verified. The trace is drawn at 0.2 mm and the design intent is 50 Ω single-ended, but no controlled-impedance stackup was ever defined for the project, so 50 Ω is an assumption rather than a calculated or measured figure. The pi matching network (1 pF / 2.0 nH / 1 pF) uses starting values with no VNA behind them and is expected to be tuned after measurement.
- The board has not been manufactured. The design is complete and the fabrication package is generated, but no production run has happened, so nothing here has been validated on real silicon.
Repository layout
hardware/ KiCad 9 project (schematic, PCB, project file)
fab/ Production package: Gerbers (4-layer), drill files,
BOM + CPL (JLCPCB format), pick-and-place, schematic PDF
images/ kicad-cli 3D rendersFabrication notes
Full notes in fab/README.txt. Highlights:
- Standard 4-layer stackup (JLC7628 or equivalent)
- RF feed line routed for 50 Ω single-ended — ask your fab to adjust trace width to their stackup
- Via-in-pad under the SOT-223 regulator tab: plugged (IPC-4761 Type VI) or at least tented
- QFN-56 (0.4 mm pitch) — stencil and reflow profile matter
- Crystal load capacitance is board-matched: use CL = 8 pF for the 40 MHz crystal (C9/C10 = 10 pF)
Status
Rev A — design complete and verification-clean; first fabrication run pending.
License
Hardware licensed under CERN-OHL-P v2 (LICENSE). Use it, modify it, build on it.
Parts
46| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5, C15, C16 |
| 4 | 10k OHM | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R7 |
| 4 | MountingHole_M2 | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 2 | 10pF | Capacitor_SMD:C_0603_1608Metric | C9, C10 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C6, C7 |
| 2 | 1pF | Capacitor_SMD:C_0402_1005Metric | C17, C18 |
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C8, C13 |
| 2 | 22pF | Capacitor_SMD:C_0603_1608Metric | C11, C12 |
| 2 | 5.1k OHM | Resistor_SMD:R_0603_1608Metric | R4, R5 |
| 2 | Conn_01x15 | Connector_PinHeader_2.54mm:PinHeader_1x15_P2.54mm_Vertical | J1, J2 |
| 2 | Conn_02x02_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J5, J6 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_B3S-1000 | SW1, SW2 |
| 1 | 2.0nH | Inductor_SMD:L_0402_1005Metric | L1 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C14 |
| 1 | 40MHz | Crystal:Crystal_SMD_5032-2Pin_5.0x3.2mm | Y2 |
| 1 | 470 OHM | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | AZ1117C-3.3 | Package_TO_SOT_SMD:SOT-223 | U2 |
| 1 | Antenna | Connector_Coaxial:U.FL_Hirose_U.FL-R-SMT-1_Vertical | ANT1 |
| 1 | Conn_02x03_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J4 |
| 1 | ESP32-S3FN8 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP4x4mm | U1 |
| 1 | PRTR5V0U2X | Package_TO_SOT_SMD:SOT-143 | D1 |
| 1 | PTC 750mA | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | RED_LED | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | USB_C_Receptacle_USB2.0_14P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | P1 |
Questions
How big is the Raiden s01 PCB?
It measures 36 × 60 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Raiden s01 use?
46 parts, built around the ESP32-S3FN8 and PRTR5V0U2X. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Raiden s01 KiCad files?
From the RaidenTechnology/raiden-s01 repository on GitHub, at the commit this page was made from: the board is hardware/Raiden S0-1.kicad_pcb and its schematic hardware/Raiden S0-1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Raiden s01 design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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