Hijacking power and bandwidth from the mobile phone's audio interface. Creating a cubic-inch peripheral sensor ecosystem for the mobile phone.

HiJack is a hardware/software platform for creating cubic-inch sensor peripherals for the mobile phone. HiJack devices harvest power and use bandwidth from the mobile phone's headset interface. The HiJack platform enables a new class of small and cheap phone-centric sensor peripherals that support plug-and-play operation.

See the Project Homepage for more details: http://www.eecs.umich.edu/~prabal/projects/hijack/

Wendell Capili wrote a really nice tutorial on libHiJack. You can find the 3 parts here:

• http://wendellinfinity.wordpress.com/2011/08/21/hijack-in-the-box-part-1/
• http://wendellinfinity.wordpress.com/2011/08/21/hijack-in-the-box-part-2/
• http://wendellinfinity.wordpress.com/2011/08/21/hijack-in-the-box-part-3/