Adafruit Feather HUZZAH ESP8266

Overview

The Adafruit Feather HUZZAH ESP8266 brings WiFi connectivity to the Feather ecosystem by integrating an ESP8266 WiFi module with USB-serial programming (via the CP2104 chip) and a LiPoly battery charger in the standard Feather form factor. Unlike the standalone HUZZAH breakout, this board requires no external USB-serial adapter — a standard Micro USB cable is all that's needed for programming and power.

The ESP8266 runs at 80 MHz with 4MB of flash memory and provides 9 GPIO pins (3.3V logic), one analog input (1.0V maximum), and a full 802.11 b/g/n WiFi stack supporting both client and access point modes with DNS. An onboard TCP/IP stack enables direct socket connections without an external networking library.

The CP2104 USB-to-serial converter supports up to 921600 baud for fast firmware uploads. Two LEDs are included: a red LED on GPIO 0 and a blue LED on GPIO 2. The integrated 100mA LiPoly charger manages 3.7V LiPo battery charging with automatic USB/battery switchover. The 3.3V regulator provides 500mA peak output. Physical dimensions are 51 × 23 × 8 mm at 6.1 grams.

The Feather HUZZAH supports Arduino IDE programming via the ESP8266 Arduino core, NodeMCU Lua (pre-loaded), and MicroPython, making it accessible to developers familiar with any of these ecosystems. It stacks with FeatherWing accessories for added displays, sensors, and radio capabilities.