Towards the end of the ‘90s, a new connection scheme aimed to create one standard for connecting computing equipment. This standard was the Universal Serial Bus (USB). Just as the name implies, USB has become the de facto standard among computing devices. The USB specification defines a strict Host Peripheral arrangement. It also allows multiple peripherals to connect to a given USB host through one or more hubs. In all cases, the host PC ultimately controls all the peripherals. Peripherals take on numerous forms such as digital camera, biometric devices, sensors, and printers. With all of these peripherals, the control of the USB is left to the host PC. In 2007, Google, along with Open Handset Alliance, publicly introduced the Android operating system, which is a Linux based operating system. About a year later, the first commercially available handset with an ARM CPU running the OS was introduced. This platform has evolved through the past few years and is now part of mobile phones, tablet computers, and numerous other embedded applications.