Arduino small form factor development boards arduino a000053 the arduino micro is a microcontroller board based on the atmega32u4 developed in conjunction with adafruit it has 20 digital inputoutput pins of which 7 can be used as pwm outputs and 12 as analog inputs a 16mhz crystal oscillator a micro usb connection an icsp header and a reset button it contains everything needed to support the microcontroller simply connect it to a computer with a micro usb cable to get started it h