Back up a file stored on an SD card to Dropbox automatically.

Best in class Arduino Yun controller.

A simple and inexpensive solution is to use a 'mobile power bank'

Arduino-library-I2CtunnelW - For Arduino Yùn, adds new REST commands, enabling tunnelling for I2C messages.

Fast function getDS1307timeStamp().

For Arduino Yùn, adds new REST commands, enabling tunnelling for I2C messages.