ARDUINO UNO

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OVERVIEW:

The Arduino UNO is a microcontroller board based on ATmega328. 

• 14 digital input/output pins of which 6 can be used as PWM outputs.
• 6 analog inputs.
• 16 MHz ceramic resonator
• USB connection
• power jack
• ICSP header
• Reset button

Power to the board can be achieved from computers USB or by AC-to-DC adapter or battery.

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 future, shields will be compatible with both the board that uses the AVR, which operates with 5V and with the Arduino Due that operates with 3.3V. The second one is a not connected pin, that is reserved for future purposes

• IOREF-
• AREF- used to provide reference to A/D converter. 
• RESET-  Used to reset the device that are connected to it or itself
• 3.3V- Power output of 3.3v which can be used to power other devices mainly Arduino Due.
• 5V- Power output of 5v.
• GND- ground
• Vin-Connect a 5v battery and get your board running i.e power arduino with this pin.
• A0~A5- Analog pins normally used to connect analog inputs/outputs they have a A/D converter under the hood.
• D0~D13- Digital pins
• D0- Rx used for receiving data serially
• D1-Tx used for transmitting data serially
• D2- Interrupt 0 external interrupt 
• D3- Interrupt 1
• D(3,5,7,9,10,11) pwm pins (pulse width pins)