I bought a
USB Nano V3.0 ATmega328 16M 5V Micro-controller CH340G board For Arduino and tried it with Arduino 1.6.6 on my MacBook Pro running OS X 10.11.1
The USB serial could not be seen. I searched on the web and found a few posts about this board, and downloaded http://www.wch.cn/download/CH341SER_MAC_ZIP.html
Most of the instructions were in Chinese, but the driver
CH341SER_MAC.ZIP 资料类型：应用资料 资料大小：250KB 资料版本：1.1 更新时间：2013-12-25 seemed to install, but I cannot seem to find any
/dev/tty and Arduino can't see any serial ports.
Has anyone had any success with this. (The seller has sold 18000 of these so someone may have got it working.)