The Arduino Uno is a type of Arduino board that is provided as an open-source board that uses an ATmega328p microcontroller in the board. The Arduino Uno contains a set of analog and digital pins that are input and output pins which are used to connect the board to other components. There are a total of fourteen I/O pins placed inboard in which six are analog input pins. The board has a USB connection that can be used to a power supply to the board. The board is used for electronics projects and used to design the circuit.

Arduino is a company that prides itself on being open-source and easy-to-use. Hobbyist groups around the internet offer code shells, hardware tutorials, and more to help aspiring creators realize their dreams. The boards themselves are modular, meaning that circuits can be assembled and disassembled easily without a need for soldering or machining. They're very capable, too - the Uno can control everything from TVs to robots.

SPECIFICATIONS:
Microcontroller: ATmega328P
Operating Voltage: 5V
Input Voltage (Recommended): 7-12V
Input Voltage (Limit): 6-20V
Digital I/O Pins: 14 (of which 6 provide PWM output)
PWM Digital I/O Pins: 6
Analog Input Pins: 6
DC Current Per I/O Pin: 20 mA
DC Current for 3.3V Pin: 50 mA
Flash Memory: 32 KB (ATmega328P) of which 0.5 KB used by bootloader
SRAM: 2 KB (ATmega328P)
EEPROM: 1 KB (ATmega328P)
Clock Speed: 16 MHz
LED_Builtin: 13
Length: 68.6 mm
Width: 53.4 mm
Weight: 25 g