Leonardo R3 microcontroller Atmega32U4 - Compatible with Arduinoo

#6 Leonardo Arduino Compatible 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 page. We no longer carry the Leonardo without headers. NOTE: You will need Arduino software v1.0.2 or later to program the Leonardo. 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