Below are the instructions for doing so on each of the tested operating systems. If you have the older CH340 drivers installed, you may need to update them. If you use a Chrome web browser, you should have the option to have the web page translated. You can find the latest version of their drivers here, but most of their pages are in Mandarin. However, there are a wide range of operating systems out there, so if you run into driver problems, you can get the archived drivers linked below: These operating systems have the CDC drivers pre-installed, which means you shouldn’t need to install any extra software.

Raspbian Buster ( release) for the Raspberry Pi.Raspbian Stretch (11-13-2018 release) for the Raspberry Pi.The latest version of the Arduino IDE (1.8.9) assumes by default that a different version of the bootloader has been installed compared with the one installed on the Chinese clones. Do these legacy voltages appear anywhere in the interface when the CH340 or the FTDI chips are employed?īTW, there is another unrelated potential problem with the Arduino Nano with CH340 driver (Chinese clones). While investigating this problem I learned that the RS232 protocol assigns nominal -12V for logical '1' and nominal +12V for logical '0'. Perhaps the micro USB cable plus adapter has different impedance characteristics vs the mini USB cable? Can somebody provide a more detailed explanation? Clearly the first stage of USB/Serial initiialization called Enumeration is not happening without the work-around. Since using the same mini USB cable works with an FTDI adapter (serial port assigned), this clearly has something to do with the CH340 driver and its interaction with the mini USB cable. By trial and error I found a work-around: use a micro USB cable (USB-A on one end, micro USB on the other), together with a mini/micro adapter plug.

This happens under Windows 10, Linux (Ubuntu), and MacOS (Mojave).

Specifically, when I plug in the device using a mini USB cable there is no response (and no serial port assignment). It has worked in the past, and the same is true of two other Arduino Nanos that I tested. My Arduino Nano with CH340 USB/Serial driver mysteriously stopped working recently.

Ch340 driver windows 7 arduino