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, it's 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 3.3V DC. Compared to the Atmel 32U4 it has 8 x the Flash memory, 16 x RAM and a much faster clock speed, 48Mhz compared to 8MHz. New to Feather? Adafruit have designed a range of processor boards with a consistent board shape and pinout together with a range of add-on boards with a huge range of functionality. The main boards are based on several popular 3.3V DC microcontrollers (MCU) so that you can choose the one that suits your requirements or your budget. MCUs include the 32U4, Atmel ATSAMD21G18 with an ARM Cortex A0 core, and the popular