Overview

The Arduino Leonardo is a microcontroller board based on the ATmega32U4. It has 23 digital input/output pins (of which 7 can be used as PWM outputs and 12 can be used as analog inputs), a 16 MHz crystal, a USB connection, a power jack, an in-circuit system programming (ICSP) header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a Micro USB cable or power it with a AC-to-DC adapter or battery to get started (USB cable and power supply are not included). This board ships with the power jack and through-hole headers soldered in, as shown in the product picture.

The Leonardo differs from all preceding Arduino boards in that the user-programmable ATmega32U4 AVR microcontroller has built-in USB functionality, eliminating the need for a secondary processor. This makes the Leonardo more versatile: in addition to supporting a virtual (CDC) serial/COM port interface, it can appear to a connected computer as a mouse and keyboard. See Arduino’s getting started page for more implications of the Leonardo’s single-MCU design.

Specification:

• 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: about 20g