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The vma103 (arduino® compatible 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, connect it to a computer with a usb cable or power it with a ac-to-dc adapter or battery to get started.