15 open source boards using the CH340N
Real designs built with the CH340N, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
Opsum
nitefood
80 × 50 mm41 parts2LMIT5
AVR/ArduinoEmuprom
agkaminski
88.3 × 68.6 mm34 parts2LCC0-1.03
FellaPC
284.9 × 96.5 mm107 parts2LCC0-1.02
ESP8266Endev v1.1
sophiayduan
36 × 70 mm59 parts2LMIT1
Zak180
188 × 128.3 mm128 parts4LCC-BY-NC-4.00
ZAK181
215.3 × 96.8 mm111 parts4LCC-BY-NC-4.00
Xinghongpai nearlink dev board
HuaqiuOpenHardware
96 × 70 mm49 parts2LCustom license0
ESP32Fluxguard
lizuyi-6
52 × 29 mm34 parts4LNo license0
Starboard
Asurant
38.5 × 48.5 mm22 parts4LNo license0
RP2040/RP2350VintageKVM
akuker
200 × 73.6 mm120 parts2LBSD-3-Clause2
AVR/ArduinoEmuprom
61.5 × 87.6 mm33 parts2LCC0-1.02
STM32NMEA2000Adapter-8.1
peterantypas
46 × 46 mm52 parts2LGPL-3.0444
RP2040/RP2350Scsi switcher
160 × 100 mm75 parts4LBSD-3-Clause2
STM32Stm8 breakout board
21.8 × 26.9 mm23 parts2LBSD-3-Clause2
WCH CH32/CH55xCh554 USB Host Test
55.1 × 19 mm19 parts2LBSD-3-Clause2
The CH340N in open source designs
The gallery holds 15 open source boards using the CH340N from 11 GitHub repositories; a typical one measures about 80 × 70 mm and carries around 49 components.
67% are two-layer designs, the rest use four layers or more, and 67% carry an open source license.
The most starred is NMEA2000Adapter-8.1 by peterantypas.
Parts used alongside the CH340N
Microcontrollers on boards using the CH340N
What boards using the CH340N are built for
CH340N: common questions
Where can I find a CH340N reference design?
Each of the 15 boards on this page is a real design using the CH340N. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
What parts are used alongside the CH340N?
The 74HC244, 74HC02, 74HC138, 74HC166 and 74HC32 appear in the most repositories here.
Which microcontrollers do boards using the CH340N use?
Most are built on AVR/Arduino (2), RP2040/RP2350 (2), STM32 (2) and WCH CH32/CH55x (1).
How big is a typical board using the CH340N?
The median is 80 × 70 mm, and 67% are two-layer designs.
What is the most popular open source board using the CH340N?
By GitHub stars, NMEA2000Adapter-8.1 by peterantypas, with 444 stars.
Can I simulate one of these boards using the CH340N before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.