Fig.2 Schematic Arduino Uno Front
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Arduino UNO is a microcontroller board it has 14 digital
input/output pins (of which 6 can be used as PWM outputs),
6 analog inputs, a 16 MHz ceramic resonator, a 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
an AC-to-DC adapter or battery to get started.