Ch330 | Driver

Close all serial monitors (PuTTY, CuteCom, Arduino Serial Monitor). Restart the Arduino IDE.

Another program is hogging the COM port. ch330 driver

The is not a mythical, hard-to-find piece of software. It is simply part of the widely compatible CH34x driver family from WCH. Whether you are using Windows, macOS, or Linux, the installation process is straightforward once you know the correct source and steps. Close all serial monitors (PuTTY, CuteCom, Arduino Serial

However, a common pain point for beginners and even experienced makers is getting the installed correctly. Without the proper driver, your operating system will not recognize the chip, making it impossible to upload code to an Arduino, ESP8266, or any other serial device that uses the CH330 as the USB interface. Close all serial monitors (PuTTY