ubuntu12.04使用USB转串口时出现权限不够问题，如下

Unable to open serial port /dev/ttyUSB0

权限不够

解决办法：

通过增加udev规则来实现。步骤如下：
创建文件/etc/udev/rules.d/70-ttyusb.rules
在文件内增加一行
KERNEL=="ttyUSB[0-9]*", MODE="0666"
重新插入USB转串口设备，普通用户就有权限访问了。

70-ttyusb.rules文件还有另一种写法，先用lsusb查看USB转串口芯片的idVendor和idProduct
#lsusb
显示结果中有这么一行
Bus 005 Device 007: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
ID 0403:6001表示idVendor=0403,idProduct=6001
70-ttyusb.rules的内容如下:
SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001",MODE="0666"
重新插入USB转串口设备，普通用户同样可以访问了

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