The Arduino Leonardo is the latest addition to the Arduino family, equipped with an ATMega 32U4 processor. This ATMega has a USB stack, which eliminates the need for the UNO's usual ATmega 8U2. Programming becomes simpler and more versatile. This Arduino emulates e.g. a keyboard or a mouse - further extensions like e.g. a MIDI emulation are planned. Thanks to the identical layout to the Arduino UNO, all shields and extensions can still be used without hardware adjustments. A Micro USB cable (like Smarthpones/cell phones) is now used for programming.