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The Arduino Leonardo is a microcontroller board based on the ATmega32u4 (datasheet). 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.
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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. It also has other implications for the behavior of the board; these are detailed on the getting started page.
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This version of the Leonardo comes assembled.
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Summary
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| Â Microcontroller | Â ATmega32u4 |
| Â Operating Voltage | Â 5V |
| Â Input Voltage (recommended) | Â 7-12V |
| Â Input Voltage (limits) | Â 6-20V |
| Â Digital I/O Pins | Â 20 |
| Â PWM Channels | Â 7 |
| Â Analog Input Channels | Â 12 |
| Â DC Current per I/O Pin | Â 40 mA |
| Â DC Current for 3.3V Pin | Â 50 mA |
| Â Flash Memory |
 32 KB (ATmega32u4) of which  4 KB used by bootloader |
| Â SRAM | Â 2.5 KB (ATmega32u4) |
| Â EEPROM | Â 1 KB (ATmega32u4) |
| Â Clock Speed | Â 16 MHz |
