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The Leonardo R3 Board Micro-USB compatible with Arduino is a micro-controller board base 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 need to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started.
The Leonardo R3 Board 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.
Specifications:
| Model Type | Arduino Leonardo |
| Microcontroller Chip | ATmega32u4 |
| Operating Voltage (VDC) | 5 |
| Input Voltage(Recommended) | 7V-12V |
| Input Voltage (limit) | 6V-20V |
| Analog I/O Pins | 12 |
| Digital I/O Pins | 20 |
| PWM Digital I/O Pins | 7 |
| Clock Speed | 16 MHz |
| Flash Memory | 32 KB |
| SRAM | 2.5 |
| EEPROM | 1 KB |
