The Arduino Leonardo is a microcontroller board based on the ATmega32u4 that looks like an Arduino Uno. The Leonardo has 20 digital Input/Output (I/O) pins (7 can be used as Pulse Width Modulation (PWM) outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an In-Circuit Serial Programming (ICSP) header, and a reset button.
It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Arduino Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual Communications Device Class (CDC) serial / COM port.
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