Adafruit Feather Main Boards - Adafruit 2821, The Adafruit Feather HUZZAH with ESP8266 WiFi uses the Internet of Things chip of choice, the ESP8266, running at 80MHz and with Arduino IDE compatibility. Adafruit have teamed up this popular chip with a CP2104 USB-serial chip allowing you to upload code at an amazing 921600 baud, plus it also handles the auto-reset to keep the bootloader happy. The ESP8266 has 4Mbytes of Flash memory, 9 x GPIO pins, 1 x analogue input (1.0V max). 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 s