2 layers258.6 × 152.1 mm
Panelized Inv Spot Disp
Emanuel600/Spotcar-Inversora
Project repo for the inverter spotcar prototype - from board to code
156 parts
4 layers30 × 36.5 mm
TwinBusExpander
Qeteshpony/TwinBusExpanderWiFi Module for TwinBus Intercom and ESPHome
- Size
- 30 × 36.5 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 31
- Nets
- 40
- Pads
- 128
- Tracks, vias
- 155, 63
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 14 Jul 2026
- Updated
- 25 Sep 2026
Overview
TwinBusExpander is an open-source printed circuit board by Qeteshpony, from the Qeteshpony/TwinBusExpander repository on GitHub, published under the BSD-2-Clause licence. It is a 4-layer board of 30 × 36.5 mm with 31 parts on 40 nets, routed with 155 tracks and 63 vias.
It is built around the ESP32-C6-WROOM-1-N8, LTV-817S and AMS1117-3.3. Its parts include 10 resistors, 5 capacitors, 4 ICs, 2 connectors and 2 switches. It belongs with the home automation and IoT and radio and wireless boards and the ESP32 and RISC-V boards of this library.
Main components
3
ESP32-C6-WROOM-1-N8
SMD,25.5x18mm-40℃~+85℃ -99.2dBm 2.4GHz 20.5dBm 382mA 3V~3.6V 78mA ESP32-C6 On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
LTV-817S
SMD-4P-55℃~+110℃ 1 1.2V 100mV@20mA,1mA 200mW 35V 3us 4us 50% 50mA 50mA 5kV 600% 6V DC Phototransistor SMD-4P Transistor, Photovoltaic Output Optoisolators ROHSLite-OnTransistor, Photovoltaic Output Optoisolators
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdParts
31| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10k | Resistor_SMD:R_0402_1005Metric | R6, R7 |
| 2 | 10u | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A | C1, C2 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R1, R10 |
| 2 | 33R | Resistor_SMD:R_0402_1005Metric | R8, R9 |
| 2 | 5k1 | Resistor_SMD:R_0402_1005Metric | R2, R3 |
| 2 | LTV-817S | Package_DIP:SMDIP-4_W9.53mm | U1, U2 |
| 2 | VAL** | Panelization:mouse-bite-2x5mm-slot-onesided-v2 | mouse-bite-2mm-slot, mouse-bite-2mm-slot |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 100n | Capacitor_SMD:C_0402_1005Metric | C5 |
| 1 | 1u | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | 220R | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 4u7 | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | Boot | Button_Switch_SMD:SW_SPST_TS-1088-xR020 | SW2 |
| 1 | ESP32-C6-WROOM-1 | PCM_Espressif:ESP32-C6-WROOM-1 | U4 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | LOGO | My_Footprints:CutieMark5mmInverted | G*** |
| 1 | Reset | Button_Switch_SMD:SW_SPST_TS-1088-xR020 | SW1 |
| 1 | Twinbus 7630 | Connector_JST:JST_PH_S3B-PH-K_1x03_P2.00mm_Horizontal | J2 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
The 27 most common of 31 parts.
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Questions
How big is the TwinBusExpander PCB?
It measures 30 × 36.5 mm and has 4 copper layers, 1.6 mm thick.
What parts does the TwinBusExpander use?
31 parts, built around the ESP32-C6-WROOM-1-N8, LTV-817S and AMS1117-3.3. 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 TwinBusExpander KiCad files?
From the Qeteshpony/TwinBusExpander repository on GitHub, at the commit this page was made from: the board is pcb/TwinBusExpander.kicad_pcb and its schematic pcb/TwinBusExpander.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TwinBusExpander design in my own project?
Its repository publishes it under the BSD-2-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).