Arduino Uno is a complete development board of microcontroller ATmega328. It is most commonly used Arduino because of compact size, a number of input-output pins, price, availability etc. It has 14 Digital input-output pins in which 6 pins provide PWM outputs and 6 Analog output pins. It has everything that a general Arduino based project needs.

Basics Components on Arduino Uno Board:

• 14 Digital and 6 Analog output pins
• A crystal oscillator of 16 MHz to provide the 16MHz clock speed
• To power, it has a USB connection and a power jack
• ICSP header and
• A reset button to upload new or reload the programme

Specification

• Input voltage: 5v to 24V
• DC current fo I/O pins: 40mA
• DC current for 3.3V I/O pins: 50mA
• Analog input-output pins: 14 in which 6 is PWM pins
• Digital input-output pins: 6
• Flash memory: 32KB
• Memory used by bootloader: 0.5KB
• SRAM: 2 KB
• EEPROM: 1 KB
• Speed: 16MHz
• Microcontroller: ATmega328