HardLabs

Comu

cyao1234·comu·hardware/comu.kicad_pcb

Comu PCB layout, top view — open source RISC-V board by cyao1234

About the Comu PCB

Comu is an open source RISC-V PCB design by cyao1234, published on GitHub under the SHL-2.1 license. It is a 2-layer board measuring 9.4 × 13 mm, with 9 components from 6 distinct parts.

Its main chip is the CH32V203F8U6, from the RISC-V family. Other key parts include the XC6206PXXXMR. By type, the board carries 3 capacitors, 2 ICs, 2 diodes and 2 resistors.

From the project

A bite-sized CH32V203 board that fits inside your USB port.

A bite-sized CH32V203 board that fits inside your USB port.

Comu is a tiny CH32V203 RISC-V computer that fits inside a USB port. It is user programmable, fitted with a custom bootloader, has four captive touch buttons and two LEDs. The board is supported by ch32fun, allowing easy and lightweight RISC-V bare-metal development.

The CH32V203 is equipped with 252KB of Flash and 20KB of SRAM, more than enough for most embedded applications. The chip also has a wide array of peripherals, including DMA and a 12bit ADC, allowing for a wide variety of uses. The board also exposes 6 GPIO pins via…

Comu, from the project README
From the project README

Main components on the Comu

CH32V203F8U6XC6206PXXXMR

Comu bill of materials (BOM)

9 components, 6 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
CH32V203F8U6
U1
1
XC6206PXXXMR
XC6206PxxxMR
U2
2
LED
D1, D2
2
1UF
1uF
C1, C2
1
100NF
100nF
C3
2
1k
R1, R2

Comu design files

The KiCad project lives in the cyao1234/comu repository on GitHub; these links point at the commit this page was built from.

Comu: common questions

What microcontroller does the Comu use?

The Comu is built around the CH32V203F8U6, from the RISC-V family.

How big is the Comu PCB?

The Comu measures 9.4 × 13 mm, has 2 copper layers and is 0.6 mm thick.

How many components are on the Comu?

9 components, from 6 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 Comu design files?

From the cyao1234/comu 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 Comu design in my own project?

It is published under SHL-2.1, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Comu without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RISC-V firmware against it before you order a PCB.

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