Arduino Nano with Mac OS Yosemite 10.10 I have an Arduino Nano and I’m trying to use it with Mac OS Yosemite (10.10). However, I’m having issues with the data transfer between the computer and the device. The Arduino is powered (LED is illuminated), however, I can’t upload anything to it. The serial port is not recognised and after installing a multitude of drivers, nothing seems to work.

Is there a specific driver or process I need to follow to enable data transfer?
Setting kext-dev-mode=1 allows unsigned kernel extensions to load, which is not recommended, as it lowers OS X security.

Instead, try the signed 64-bit kernel extension from FTDI here: http://www.ftdichip.com/Drivers/VCP.htm , version 2.3, which does require changing OS security permissions.