SainSmart Due SAM3X8E for for Robot Arduino UNO MEGA2560 R3 Duemilanove 2013 AT91SAM3X8E ARM 32-bit Microcontroller @ 84MHz Operating Voltage: 3.3V 54 digital I/O pins, 12 analog inputs, 2 DAC (analog output) Flash Memory: 512 KB all available for the user applications SRAM: 96 KB (two banks: 64KB and 32KB)