Arduino M0 with SAMD21 MCU Microcontroller: ATSAMD21G18, 48pins LQFP Operating Voltage: 3.3V Digital I/O Pins: 14, with 12 PWM and UART Analog Input Pins: 6, 12-bit ADC channels Flash Memory: 256 KB - SRAM: 32 KB - Clock Speed: 48 MHz