Microcontroller Atmel ATmega168Operating Voltage (logic level): 5VInput Voltage (recommended): 7V ~ 12VInput Voltage (limits): 6V ~ 20 VDigital I/O Pins: 14 (of which 6 provide PWM output)Analog Input Pins: 8DC Current per I/O Pin: 40mAFlash Memory: 14KB (ATmega168)EEPROM: 1KB (ATmega168)Clock Speed: 16MHz
Microcontroller Atmel ATmega328 Operating Voltage (logic level): 5V Input Voltage (recommended): 7V ~ 12V Input Voltage (limits): 6V ~ 20 V Digital I/O Pins: 14 (of which 6 provide PWM output) Analog Input Pins: 8 DC Current per I/O Pin: 40mA Flash Memory: 32KB (ATmega328) (of which 2 KB used by bootloader) SRAM: 2KB (ATmega328) EEPROM: 1KB (ATmega328) Clock Speed: 16MHz