SparkFun SAMD21 Mini Breakout ATSAMD21G18 32-bit/48MHz ARM Cortex-M0+ 256KB Flash Memory 32KB SRAM 32KB of EEPROM (emulated in Flash) 22 GPIO Count 14 ADC Channels at 12-bit Resolution Analog-to-Digital and Digital-to-Analog Converters (ADC & DAC) Pro Mini/Micro Layout Integrated USB Controller