The Arduino Leonardo is a microcontroller board based on the ATmega32u4. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an 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 Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. More information: Features | Form factor | Arduino | Memory | Flash memory | 0.032 MB |  | SRAM (Static Random Access Memory) | 2.5 KB | | EEPROM (Electrically Erasable Programmable Read-Only Memory) | 1 KB | Power | DC input voltage | 7-12 V | | Operating voltage | 5 V | | Input voltage (max) | 6 - 20 V | | DC current per I/O pin | 40 mA | Ports & interfaces | USB ports quantity | 1 | | Number of digital I/O pins | 20 | | Number of analog I/O pins | 12 | | PWM digital I/O pins | 7 | Weight & dimensions | Board dimensions | 53.3 x 68.6 mm | Processor | Microcontroller model | ATMega32u4 | | Microcontroller frequency | 16 MHz |
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