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Base node

koko69420·HomeBus·Hardware/base_node/base_node.kicad_pcb

Base node PCB layout, top view — open source WCH CH32/CH55x board by koko69420

About the Base node PCB

Base node is an open source WCH CH32/CH55x PCB design by koko69420, published on GitHub. It is a 2-layer board measuring 60 × 60 mm, with 29 components from 22 distinct parts.

Its main chip is the CH32X033F8P6, from the WCH CH32/CH55x family. Other key parts include the MAX491E, 74HC165 and MP1584EN_Module. By type, the board carries 8 resistors, 7 connectors, 5 capacitors, 4 ICs, 4 diodes and 1 switch.

From the project

Hard wired home automation, based on a RSICV MCU and RS-422 communication protocol

The HomeBus Base Node is the primary in-wall actuator and sensor module in the HomeBus distributed automation network. Designed to fit into standard residential switch flush boxes behind wall plates, it interfaces physical toggle switches and rotary encoders with the HomeBus RS-422 serial bus while driving external relay modules to switch lights, appliances, and inductive loads.

Base node, from the project README
From the project README

Main components on the Base node

CH32X033F8P6MAX491E74HC165MP1584EN_Module

Base node bill of materials (BOM)

29 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
CH32X033F8P6
U1
1
MAX491E
U2
1
74HC165
U3
1
MP1584EN_Module
U4
1
IO Interface
J1
1
RS-422 Connector
J2
1
Expantion Connector
J3
1
I2C
J4
1
24vdc
J5
1
Encoder 1
J6
1
Encoder 2
J7
1
SW_DIP_x08
SW1
2
SM712_SOT23
D1, D3
1
WS2812B
D2
1
SMBJ26A
D4
4
100nF
C1, C3, C5, C7
1
10uF
C2
1
330Ω
R1
1
10KΩ
R4
2
120Ω
R5, R6
Show 2 more
QtyPartRefs
2
4.7kΩ
R7, R8
2
10KΩ
RN1, RN2

Base node design files

The KiCad project lives in the koko69420/HomeBus repository on GitHub; these links point at the commit this page was built from.

Base node: common questions

What microcontroller does the Base node use?

The Base node is built around the CH32X033F8P6, from the WCH CH32/CH55x family.

How big is the Base node PCB?

The Base node measures 60 × 60 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Base node?

29 components, from 22 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 Base node design files?

From the koko69420/HomeBus 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 Base node design in my own project?

The repository has no license, so all rights stay with koko69420. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Base node without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug WCH CH32/CH55x firmware against it before you order a PCB.

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