#RZ01 Arduino Uno R3 Microcontroller - Atmel ATmega328

The Arduino Uno is a microcontroller board based on the ATmega328. It has 14
digital input/output pins (of which 6 can be used as PWM outputs), 6
analog inputs, a 16 MHz crystal oscillator, 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.

The Uno differs from all preceding boards in that it does not use the FTDI
USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up
to version R2) programmed as a USB-to-serial converter.

Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground,
making it easier to put into DFU mode.

Revision 3 of the board has the following new features:
1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other
new pins placed near to the RESET pin, the IOREF that allow the
shields to adapt to the voltage provided from the board. In the future,
shields will be compatible both with the boards that use the AVR, (which
operates @ 5V) and with the Arduino Due that operate @ 3.3V. The second
one is a not connected pin, that is reserved for future purposes.

*Note: This is not an original Arduino brand product, it is manufactured with
the same components and functionality by a different manufacturer.

Specs:
Microcontroller: ATmega328
Operating Voltage: 5V
Input Voltage (recommended):7-12V
Input Voltage (limits): 6-20V
Digital I/O Pins: 14 (of which 6 provide PWM output)
Analog Input Pins: 6
DC Current per I/O Pin: 40 mA
DC Current for 3.3V Pin: 50 mA
Flash Memory: 32 KB (ATmega328) of which 0.5 KB used by bootloader
SRAM: 2 KB (ATmega328)
EEPROM: 1 KB (ATmega328)
Clock Speed: 16MHz

Includes:
1 x Arduino Uno R3 Microcontroller board
1 x USB cable