Arduino Uno R3 Dip

Sepcifications

Microcontroller: ATmega328
Operating voltage: 5 V
Input voltage (recommended): 7-12 V
Digital I/O pins: 20 (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: 16 MHz

 The Arduino Uno has 20 total available I/O lines; all of them can function as digital I/O lines, and six of them can be used as analog inputs.