Arduino Leonardo

From the shop's description

Arduino Leonardo 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. Features: Microcontroller: ATmega32u4. 20 digital I/O pins (7 PWM outputs, 12 analog inputs). Built-in USB communication, enabling HID functionality. 16 MHz crystal oscillator for precise timing. Micro USB connection for programming and power. Power options: USB, AC-to-DC adapter, or battery. ICSP header for in-circuit serial programming. Reset button for easy restarting of the board. Features a barrel plug connector, that works great with a standard 9V battery. Specifications: Board Arduino Leonardo Microcontroller ATmega32u4 USB connector Micro USB (USB-B) Pins Built-in LED Pin 13 Digital I/O Pins 20 Analog input pins 12 PWM pins 7 Communication UART Yes I2C Yes SPI Yes Power I/O Voltage 5V Input voltage (nominal) 7-12V Input voltage (MAX) 6-20V DC Current per I/O Pin 10 mA DC Current per I/O Pin (MAX) 20 mA DC Current per +3.3V Pin (MAX) 50 mA Power Supply Connector Barrel Plug Clock speed Processor ATmega32U4 16 MHz Memory Flash Memory 32 KB of which 4 KB used by bootloader SRAM 2.5 KB EEPROM 1 KB Dimensions Weight 20 g Width 53.3 mm Length 68.6 mm PINOUT: Applications: Human Interface Devices (keyboards, mice, game controllers). Interactive installations and art projects. Robotics and automation systems. Educational tools for learning programming and electronics. Prototyping USB-based devices. Package Contents: 1x Arduino Leonardo Board NOTE: cable not included (normal micro USB cables can be used). Documents: Getting started guide Full pinout Schematic CAD files Keyboard library Mouse library ATmega32u4 chip datasheet Example projects using Arduino Leonardo