plocher/cpNode-XiaocpNodes are Arduino-ecosystem nodes created by Model Railroad Control Systems' for the Computer Model Railroad Interface (CMRI) system.
CpNode Xiao is an open-source printed circuit board by plocher, from the plocher/cpNode-Xiao repository on GitHub. It is a 2-layer board of 79.8 × 68.8 mm with 48 parts on 34 nets, routed with 239 tracks and 20 vias.
It is built around the MAX3491EPD+, BSS138 and BAT54. Its parts include 12 resistors, 7 connectors, 4 capacitors, 3 diodes and 3 transistors. It belongs with the ESP32 and RISC-V boards of this library.
cpNodes are Arduino-ecosystem nodes created by Model Railroad Control Systems' for the Computer Model Railroad Interface (CMRI) system.
The Xiao variations by SPCoast use the ESP32 family of microcontrollers, and communicate with each other and with classic C/MRI nodes via CMRInet. These controllers also support WiFi and Bluetooth for future protocol development.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10k | SPCoast:0603-RES | R8, R9, R10, R21, R22 |
| 4 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | TERM-A1, TERM-B1, TERM-RX1, TERM-TX1 |
| 2 | 10K | SPCoast:0603-RES | R25, R26 |
| 2 | 120R | SPCoast:0603-RES | R23, R24 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q8, Q9 |
| 2 | CON_1x-5-3.5-screw | SPCoast:Connector_01x05_V-CMRINET-3.5MM | RS485-3, RS485-4 |
| 2 | Conn_01x07_Socket | SPCoast:PinSocket_1x07_P2.54mm_Vertical | J1, J2 |
| 2 | Vout | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | CON2, CON3 |
| 2 | ~ | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J6, J7 |
| 1 | 0.01uF | SPCoast:0603-CAP | C4 |
| 1 | 0.1uF | SPCoast:0603-CAP | C2 |
| 1 | 1uF | SPCoast:0603-CAP | C3 |
| 1 | 220uF | SPCoast:CP_Elec_8x10 | C1 |
| 1 | 2k2 | SPCoast:0603-RES | R5 |
| 1 | 330 | SPCoast:0603-RES | R4 |
| 1 | 5k6 | SPCoast:0603-RES | R35 |
| 1 | 7.5-12VDC @3A | SPCoast:SILK_Label-Power_CP | PWR-LABEL1 |
| 1 | BAT54 | Package_TO_SOT_SMD:SOT-23 | D1 |
| 1 | CON_DIP-14 | SPCoast:XS-DIP14 | XS2 |
| 1 | DCJ0202 | Connector_BarrelJack:BarrelJack_Kycon_KLDX-0202-xC_Horizontal | J3 |
| 1 | Green | SPCoast:0603-LED | LED1 |
| 1 | I2C | SPCoast:Connector_I2C-0.100_R | I2C1 |
| 1 | I2C-OLED | SPCoast:Connector_I2C-OLED | I2CLED64 |
| 1 | LM78M05_TO252-2 | Package_TO_SOT_SMD:TO-252-2 | VR5.0 |
| 1 | MAX3491EPD+ | Package_DIP:CERDIP-14_W7.62mm_SideBrazed | U2 |
| 1 | OSHW | SPCoast:SILK_Label-OSHW | OSHW1 |
| 1 | Q_P-FET_8A_SOP-8_A04443 | Package_SO:HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.4x3.2mm | Q1 |
| 1 | Red | SPCoast:0603-LED | LED2 |
| 1 | SPCoastLogo | SPCoast:SILK_Logo-SPCoast | Logo1 |
| 1 | SW_Push | SPCoast:SW_Push_SPST_6mmx6mm_PTH | SW1 |
| 1 | XIAO-ESP32-C6 | SPCoast:XIAO-ESP32-C6 | U1 |
| 1 | Yellow | SPCoast:0603-LED | TX0 |
| 1 | cpNode Xiao | SPCoast:SILK_BoardID | DOC1 |
| 1 | ~ | SPCoast:Board_068x080 | BOARD0 |
It measures 79.8 × 68.8 mm and has 2 copper layers, 1.6 mm thick.
48 parts, built around the MAX3491EPD+, BSS138 and BAT54. 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.
From the plocher/cpNode-Xiao repository on GitHub, at the commit this page was made from: the board is cpNode-Xiao.kicad_pcb and its schematic cpNode-Xiao.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask plocher before reusing the design.
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