Arduino Uno the most popular Arduino controller
• new USB controller, no additional drivers required
• Wide variety of accessory "Shields" available
• It is intended for roboticists, artists, designers and hobbyists
• Variety of I/O pins including analog, digital, PWM and more
• Based on the ATmega328
• Revision 3
• Open Source design based on the larger ATmega2560
• 54 digital I/O Pins and 16 analog I/O Pins
• 256 KB of Flash Memory, 8 KB of SRAM, and 4kB of EEPROM
• Clock Speed: 16 MHz