1.Atmega 16U2 replace the 8U2.

2.Microcontroller: ATmega328.

3.Operating Voltage: 5V.

4.Input Voltage (recommended): 7-12V.

5.Input Voltage (limits): 6-20V.

6.Digital I/O Pins: 14 (of which 6 provide PWM output).

7.Analog Input Pins: 6.

8.DC Current per I/O Pin: 40 mA.

9.DC Current for 3.3V Pin: 50 mA.

10.Flash Memory: 32 KB (ATmega328) of which 0.5 KB used by bootloader.

11.SRAM: 2 KB (ATmega328).

12.EEPROM: 1 KB (ATmega328).

13.Clock Speed: 16 MHz.