CH341SER USB Driver Download

Download Driver

File: CH341SER.zip

Compatible Chips: CH340 / CH341

Quick Overview

The CH341SER driver supports CH340 and CH341 USB to Serial converter chips manufactured by WCH (Jiangsu Qinheng Co., Ltd). These chips are widely used in affordable Arduino-compatible boards and many Chinese-made development boards due to their low cost and reliability.

Common Uses:

Arduino Uno compatible boards with CH340G chip
Arduino Nano clones with CH340 chip
ESP32 development boards with CH340 USB-to-Serial converter
ESP8266 NodeMCU boards with CH340
Various DIY electronics projects and prototyping boards

COMPATIBLE PRODUCTS

The following DIYables products use the CH340/CH341 chip and require this driver:

Add your CH340/CH341 based products here

DRIVER INSTALLATION

Normally, the driver for this board is automatically supported by the Arduino IDE. However, in some cases, the Arduino IDE may not recognize the board properly. If that happens, please follow the instructions below to install the driver manually.

Download the Driver: Download the CH341SER driver from the following links:

Unzip the Driver

After downloading, unzip the contents of the file to a folder on your computer. There is no installation executable in the package.
Open Device Manager

Press Windows + X and select Device Manager, or search for "Device Manager" in the Start menu.
Locate the device under Ports (COM & LPT), You will see a port usually listed as USB Serial Port or similar as below image.
Connect the Board

Connect your board to the computer using a USB cable.
Watch the Ports (COM & LPT) section in Device Manager to see which new serial port appears when the board is connected. This is your device.

Update the Driver

Right-click on the detected serial device (e.g., "USB Serial Port") and choose Update driver, like the below image:

In the window that appears, select Browse my computer for drivers.

Select the Unzipped Folder

Click Browse, then navigate to the folder where you unzipped the driver.
Click Next and follow the prompts to complete the installation.

Finish

Once the driver is installed, the device should appear correctly under Ports (COM & LPT) in Device Manager. It looks like below images:

Note that if it does not work, you may need to uninstall the existing driver for that COM port before installing new driver as the instruction above.

TROUBLESHOOTING

Driver Installation Issues

Problem: Driver installation fails on Windows

Run the installer as administrator
Temporarily disable antivirus software
Uninstall any previous CH340/CH341 drivers first
Make sure you have administrator privileges

Problem: "System Extension Blocked" on Mac

Go to System Preferences → Security & Privacy
Click the lock icon to make changes
Click "Allow" next to the blocked system extension message
Restart your Mac

Device Not Recognized

Problem: Board not showing up in Device Manager (Windows)

Try a different USB cable (some cables are charging-only without data lines)
Try a different USB port on your computer
Check if the board has a power LED indicator (should be lit)
Restart your computer
Reinstall the driver

Problem: No /dev/ttyUSB* device on Linux

Check dmesg output: dmesg | tail -20
Verify the CH341 module is loaded: lsmod | grep ch34
Try unplugging and replugging the USB cable
Check USB cable quality

COM Port Issues

Problem: COM port not showing in Arduino IDE

Close and reopen Arduino IDE
Click Tools → Port to refresh the port list
Verify the driver is installed correctly in Device Manager
Try resetting the board by pressing the reset button

Problem: Permission denied error on Linux

Add your user to the dialout group: sudo usermod -a -G dialout $USER
Log out and log back in
Alternatively, use sudo: sudo arduino (not recommended)

Upload Issues

Problem: Failed to upload sketch to board

Make sure you selected the correct COM port in Arduino IDE
Make sure you selected the correct board type
Try lowering the upload speed (Tools → Upload Speed → 57600)
Press and hold the reset button, click upload, release reset after upload starts
Check your USB cable quality

TECHNICAL SPECIFICATIONS

Supported Chips:

CH340G, CH340C, CH340K, CH340E, CH340B, CH340T
CH341A, CH341T

Supported Operating Systems:

Windows 11, 10, 8.1, 8, 7, Vista, XP (32-bit and 64-bit)
MacOS 10.9 and later (including macOS Monterey, Ventura, Sonoma)
Linux kernel 2.6.24 and later

Interface:

USB 2.0 Full Speed (12 Mbps)
Serial UART interface

Baud Rates Supported:

50 bps to 2 Mbps

FREQUENTLY ASKED QUESTIONS

Q: Do I need to install this driver?

A: Most modern operating systems (Windows 10/11, macOS, Linux) include generic USB serial drivers that may work. Only install this driver if your board is not recognized by your computer.

Q: Is this driver safe?

A: Yes, this is the official driver from WCH, the manufacturer of the CH340/CH341 chips. Always download from official sources or trusted websites.

Q: Can I use the same driver for all CH340/CH341 variants?

A: Yes, the CH341SER driver supports all variants including CH340G, CH340C, CH340K, CH341A, etc.

Q: Why does my board show up as CH340 instead of Arduino?

A: This is normal for Arduino-compatible boards that use the CH340 chip instead of the official ATMEGA16U2 or FT232 chip. The board will function the same way.

Q: Will this driver work with ESP32 or ESP8266 boards?

A: Yes, if your ESP32 or ESP8266 board uses a CH340 or CH341 chip for USB-to-Serial conversion. Check your board specifications.

ADDITIONAL RESOURCES

Official WCH Website:

http://www.wch.cn/
Official driver downloads and documentation

Arduino IDE:

Make sure you have the latest version of Arduino IDE installed
Download from arduino.cc

Support:

For technical support, contact us at support@diyables.io
Include your operating system version and board model