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 ESP8266 which is widely used in Internet of Things (IoT) projects. Because Adafruit has used the smallest components available there’s room at one end of the board for a specialist function such as an SD-card holder, Bluetooth LE, packet radio, LoRa, a prototyping area or even WiFi. The Feather main boards feature a USB port for power and programming, a LiPo battery connector, 20 x GPIO pins including PWM output on all pins, 6 x analogue inputs, 1 x analogue output, and support for serial, I2C and SPI in hardware. Each one has a 3.3V DC regulator which is able to supply up to 500mA peak current. The boards have a 100mA LiPo charging function with a status indicator LED and there’s also a general purpose LED for blinking. The Feather boards are about ⅓ x the size of an Arduino UNO and there’s even a Reset button.Once you’ve chosen your processor, select one or more FeatherWing add-on boards and get developing. The range includes development tools such as prototype boards and an over-size board with screw terminal blocks for external wiring.Supplied with an assembled and tested main board plus strips of 01.in. header pins for you to solder on as required. Adafruit supply an extensive free tutorial which contains everything you could need. Adafruit 2796 Feather M0 Adalogger Datalogger with Micro SD Slot