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.
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 with the Arduino Leonardo guide.
Technical Specifications:
| Microcontroller |
ATmega32u4 |
| Operating Voltage |
5V |
| Input Voltage (Recommended) |
7-12V |
| Input Voltage (limits) |
6-20V |
| Digital I/O Pins |
20 |
| PWM Channels |
7 |
| Analog Input Channels |
12 |
| DC Current per I/O Pin |
40 mA |
| DC Current for 3.3V Pin |
50 mA |
| Flash Memory |
32 KB (ATmega32u4) of which 4 KB used by bootloader |
| SRAM |
2.5 KB (ATmega32u4) |
| EEPROM |
1 KB (ATmega32u4) |
| Clock Speed |
16 MHz |
| Length |
68.6 mm |
| Width |
53.3 mm |
| Weight |
20 g |
