Arduino/Genuino Uno is a microcontroller board
based on the ATmega328P (datasheet
It has 14 digital input/output pins (of which 6 can
be used as PWM outputs), 6 analog inputs, a 16 MHz
quartz crystal, 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 a AC-to-DC adapter or battery to get
started.. You can tinker with your UNO without
worring too much about doing something wrong, worst
case scenario you can replace the chip for a few
dollars and start over again.
"Uno" means one in Italian and was chosen to mark
the release of Arduino Software (IDE) 1.0. The Uno
board and version 1.0 of Arduino Software (IDE)
were the reference versions of Arduino, now evolved
to newer releases. The Uno board is the first in a
series of USB Arduino boards, and the reference
model for the Arduino platform; for an extensive
list of current, past or outdated boards see the
Arduino index of boards.
You can find here
your board warranty informations.
You can find in the Getting Started section
all the information you need to configure your
board, use the Arduino Software (IDE), and start
tinker with coding and electronics.