Adafruit Feather HUZZAH with ESP8266 Wi-Fi®

Adafruit Feather HUZZAH with ESP8266 Wi-Fi® is designed as an all-in-one ESP8266 Wi-Fi development board with built-in USB and battery charging. The board features the ESP8266 Wi-Fi microcontroller clocked at 80MHz and at 3.3V logic. The ESP8266 includes a Tensilica chip core and a full WiFi stack. Designers can program the microcontroller using the Arduino IDE for an easy-to-run Internet of Things core.

The Adafruit Feather HUZZAH with ESP8266 Wi-Fi is available in three variants:

3046 - Includes pre-installed standard headers (No soldering required)
3213 - Includes pre-installed stacking headers (No soldering required)
2821 - Includes un-installed standard headers (Soldering required)

To support portable projects, the board includes a connector for Adafruit 3.7V lithium polymer batteries and built-in battery charging.

Features

Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers
Weight 9.7 grams
ESP8266 @ 80MHz with 3.3V logic/power
4MB of FLASH (32MBit)
Built-in Wi-Fi 802.11 b/g/n
3.3V regulator with 500mA peak current output
CP2104 USB-Serial converter onboard with 921600 maximum baud rate for speedy uploading
Reset button

Auto-reset support for getting into bootload mode before firmware upload
9 GPIO pins - can also be used as I²C and SPI
1 analog input 1V max.
Built-in 100mA LiPoly charger with charging status indicator LED can also cut a trace to disable the charger
Pin #0 red LED for general purpose blinking. Pin #2 blue LED for boot loading debug and general purpose blinking
Power/enable pin
4 mounting holes