USB to Serial converter HL-340: download 32 and 64 bit windows drivers. The chip PL2303 while Windows XP identifies it as USB-SERIAL CH340, but I guess. Try a driver checking tool such as DriverIdentifier Software. As there are many drivers having the same name, we suggest you to try the Driver Tool, otherwise you can try one by on the list of available driver below. Please scroll down to find a latest utilities and drivers for your USB-SERIAL CH340 (COM3) driver.
If you are like me and ordered a cheap arduino nano clone from a chinese website like aliexpress or banggood, chances are that they come with the cheaper CH340 USB to Serial chip. This is a cheap chip that manufacturers exploit to make the clone a lot cheaper. This can also be a downside. For me, being a mac user, I had a real hard time finding drivers etc for it. In the end I found some drivers, which were pretty good and I finally could get a blink sketch uploaded. I now want to share my experience for future buyers so you can get it working a lot faster. If everything is done correctly and there were no errors appearing.
![Usb Serial Ch340 Driver Windows 7 Usb Serial Ch340 Driver Windows 7](http://www.geekfactory.mx/wp-content/uploads/2015/07/instalar_CH340_windows_2.bmp)
You should be able to restart your arduino IDE and see the port. For my mac it is usually like above in the picture but sometimes it changes. You will also notice that once in a while (maybe 1 time of 3) you will get errors when uploading but you do not have to care, the code will usually upload either way. I hope this tutorial helped you and remember that the CH340 chip is a bit complicated and it may also be used in other cheap arduino board clones.
Thanks for reading and once again, I hope it helped you. As a linux user (Ubuntu / Linux Mint 17) I had difficulties with the cheap Nano with the CH340G chip getting it to work properly - the upload of any code didn't work at all.
Of course I had installed the Arduino IDE (apt-get install arduino) but was not able to program the Arduino nano. Then I found in a german web article that from time to time you have to reinstall the IDE after a system update of the kernel, so that the serial USB interface works again. I didn't do it but my Nano started to blink when connected to the USB port so I thought it couldn't be out of order and should work anyhow. After connecting it to USB in the /dev folder you should find a file called ttyUSB0 or ttyUSB1 or so. In my /dev folder I had found it. So I started again, setting the Arduino IDE platform tool menu 'Tools' and 'Board' to 'Arduino Nano w/ATmega328' (in my case) and 'Tools' 'Serial port' to '/dev/ttyUSB1' (in my case).
Now, the code from the 'Blink' example in the IDE could be uploaded to the Nano board as it should be and the LED started to blink.