 Microcontroller Atmel ATmega168 or ATmega328

 Operating Voltage (logic level) 5 V

 Input Voltage (recommended) 7-12 V

 Input Voltage (limits) 6-20 V

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

 Analog Input Pins 8

 DC Current per I/O Pin 40 mA

 Flash Memory 16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader

 SRAM 1 KB (ATmega168) or 2 KB (ATmega328)

 EEPROM 512 bytes (ATmega168) or 1 KB (ATmega328)

 Clock Speed 16 MHz

 Dimensions 0.73 x 1.70