LEONARDO R3, ATmega32U4

The LEONARDO is an integrated USB HID board. Ideal for projects requiring the board to behave (act) as a USB human interface devices (keyboard, mouse, etc...).

The 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 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 (USB cable and power supply are not included).

Technical characteristics LEONARDO R3, ATmega32U4

• Input voltage: DC 7V~12V 
• Regulator type (5V): LDO (linear) 
• Output current: 5V=1A, 3.3V=800mA 
• Microcontroller: ATmega32U4 
• Clock: 16MHz 
• I/O: 23 
• PWM: 7 
• Analog inputs: 12 
• USB connector: MicroUSB