Adafruit feather main boards adafruit 2796 the adafruit feather 32u4 adalogger datalogger can form the core for your next data logging project with its built in sd card slot the atmel atsamd21g18 is a very interesting chip its the one chosen to power the arduino zero so you know it will be supported by arduino development tools libraries and ides it has a cortex m0 core with 256kbytes of flash memory 32kbytes of ram and runs at 48mhz and 33v dc compared to the atmel 32u4 it has 8 x t