See Arduino’s getting started page for more implications of the Leonardo’s single-MCU design. 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. 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 board ships with the power jack and through-hole headers soldered in, as shown in the product picture. 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). 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. The Arduino Leonardo is a microcontroller board based on the ATmega32U4. The Leonardo works with our motor and robot shields, and it works with our Wixel shield in a limited capacity: the wireless serial features work, but the wireless reprogramming does not. As such, there could be incompatible Arduino shields and libraries. Note: There are differences between the Leonardo and previous Arduino boards.
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