Arduino Yun Mini Microcontroller: ATmega32u4 @ 16MHz and Atheros AR9331, MIPS 24K processor operating at up to 400 MHZ Operating Voltage: 3.3V to 5V Digital I/O Pins: 20, with 7 PWM and UART Analog Input Pins: 12, 12-bit ADC channels Memory: Flash: 32 KB - SRAM: 2.5 KB - Flash Atheros: 16MB - RAM: 64MB DDR2