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Gateway node

koko69420·HomeBus·Hardware/Gateway_node/Gateway_node.kicad_pcb

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

About the Gateway node PCB

Gateway node is an open source WCH CH32/CH55x PCB design by koko69420, published on GitHub. It is a 2-layer board measuring 60 × 55 mm, with 31 components from 18 distinct parts.

Its main chip is the CH32X033F8P6, from the WCH CH32/CH55x family. Other key parts include the 74HC165, MAX491E and AT24C256C-SSHL. By type, the board carries 8 diodes, 7 capacitors, 7 resistors, 6 ICs, 2 connectors and 1 switch.

It belongs with the dev boards & breakouts and iot & wireless designs in this gallery.

From the project

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

The HomeBus Gateway Node serves as the vital routing bridge, segmentation barrier, and protocol proxy between the central HomeBus Trunk Backbone Bus and individual Room Sub-Buses.

By dividing the physical automation topology into isolated room-level segments, the Gateway prevents local switch bounces, encoder streams, and internal room traffic from congesting the primary backbone while safeguarding against bus-wide failures.

Gateway node, from the project README
From the project README

Main components on the Gateway node

CH32X033F8P674HC165MAX491EAT24C256C-SSHL

Gateway node bill of materials (BOM)

31 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
CH32X033F8P6
U1
1
74HC165
U2
1
~
U3
2
MAX491E
U4, U5
1
AT24C256C-SSHL
U6
1
RS-422 Room
J1
1
RS-422 Trunk
J2
1
SW_DIP_x08
SW1
1
D_TVS
D1
4
SM712_SOT23
D2, D3, D4, D5
1
WS2812B
D6
2
LED
D7, D8
6
100nF
C1, C2, C4, C5, C6, C7
1
10uF
C3
1
330Ω
R1
3
10KΩ
R2, R3, R4
2
4.7kΩ
R5, R6
1
10KΩ
RN1

Gateway 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.

Gateway node: common questions

What microcontroller does the Gateway node use?

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

How big is the Gateway node PCB?

The Gateway node measures 60 × 55 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Gateway node?

31 components, from 18 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 Gateway 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 Gateway 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 Gateway 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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