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Low-cost CH32V003 USB dev board with RISC-V MCU

Oct 14, 2023 — by Giorgio Mendoza 2,312 views

LECTRONZ has recently featured the CH32V003 USB Development Board which was designed to provide developers and enthusiasts with a versatile and compact platform for RISC-V microcontroller experimentation.

As its name implies, at the heart of this board made by nanodyne, features the cost-effective CH32V003F4U6 microcontroller by WCH, boasting a clock frequency of up to 48 MHz, 16KB of Flash memory, and 2KB of RAM.


CH32V003 USB PCB design
(click image to enlarge)

The board comes with an external crystal pre-installed, but it can be readily removed and bypassed with a solder bridge, offering flexibility in clock configuration to suit users’ specific needs.

There are 13 (or 15 when considering crystal pins) of the 18 GPIOs directly accessible from the side pins. Additionally, there is a user LED at PC0 and a user button at PD7, which also serves a reset functionality.


CH32V003 USB bottom view
(click image to enlarge)

The product page emphasizes the board’s capacity to utilize bitbanged USB with the rv003usb stack by CNLohr, making it an ideal plug-and-play platform for USB peripheral applications. Additionally, three of the 18 available GPIOs are designated for USB functionality, with accessible USB data lines via two through-holes on the board’s interior.

The product page mentions that the board is fully compatible with the open-source ch32v003fun project. Furthermore, the PCB design is open source with the CERN-OHL-W-2.0 license and available on GitHub


CH32V003 USB top view
(click image to enlarge)

To program the board, users require a compatible SWIO programmer, such as the WCH LinkE. Alternatively, users can utilize other programmers, like the ESP32-S2, as described in the documentation

Lastly, Arduino enthusiasts can utilize the Ardulink project to program the board with an AVR-based ATMega328P device (i.e. Uno R3, Nano, etc).

 Further information

The CH32V003 USB Development Board is primarily intended for development and evaluation purposes. It is priced at $5.16 for a single unit, with volume discounts available; for instance, two units cost $5.58, three units cost $6.42, and so on.

(advertise here)


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4 responses to “Low-cost CH32V003 USB dev board with RISC-V MCU”

  1. Giorgio Mendoza says:

    yep, it’s covered here as well. Forgot to reference it. https://linuxgizmos.com/the-nanoch32v003-is-a-risc-v-dev-board-available-for-1-50/

  2. Lectronz says:

    I just wanted to let you know that we (Lectronz) did not release that board, and we wouldn’t want to take credit for something we didn’t do. This board was released by “nanodyne” from Germany: https://lectronz.com/stores/nanodyne

    We (lectronz) are in fact a new marketplace where many open-source hardware creators like “nanodyne” get the opportunity to sell their products. You can think of us like an “Etsy for Electronics”, or a better version of “Tindie” :-)

    • Giorgio Mendoza says:

      Thank you for the clarification. I’ve updated the article to accurately credit nanodyne for the board’s release.

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