Description 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 Type Drive IC Weight 25g