<P>Adafruit are setting a new standard for single board microcontrollers and it's called Feather. The range is based around a small collection of microcontrollers and a large collection of add-on cards, all with the same small footprint.</P><P><B>New to Feather?</B> 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 Atmel 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 each board for a specialist function such as an SD-card holder, Bluetooth LE, packet radio, LoRa, a prototyping area or even WiFi. </P><P>The <B>Feather main boards</B> feature a USB port for power and programming, a LiPo battery connector, and support for serial, I2C and SPI in hardware. The various processors offer different numbers of GPIO pins and analogue inputs, please refer to the individual product pages and the technical specification for details. 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.</P>
