# Adafruit Feather HUZZAH ESP8266 > All-in-one ESP8266 WiFi Feather board at 80 MHz with 802.11 b/g/n, USB-serial (CP2104), LiPo charging, 9 GPIO, and 4MB flash — the easiest way to add WiFi to a portable battery-powered project. ## Quick Facts - **Brand:** Adafruit - **Board Type:** dev-board - **Price:** ~$14.95 - **Product Readiness:** developer - **CPU:** ESP8266 Tensilica L106 @ 80 MHz - **CPU Architecture:** Xtensa LX106 - **CPU Cores:** 1 - **RAM:** 80 KB - **Flash:** 4MB - **Power:** 3.7V LiPo via JST or 5V Micro USB - **Operating Voltage:** 3.3V - **Dimensions:** 51 × 23 × 8 mm - **Weight:** 6.1g - **Antenna:** Built-in PCB antenna ## Connectivity - **Wifi:** 802.11 b/g/n ## Open Source - **Firmware:** No - **Schematics:** Yes - **PCB Layout:** Yes ## Compatible Firmware arduino, micropython, Tasmota, esphome, platformio ## Use Cases - iot - wifi-projects - home-automation - portable - battery-powered ## Components - **ESP8266** (soc): Espressif ESP8266 Tensilica L106 at 80 MHz with full 802.11 b/g/n WiFi, integrated TCP/IP stack, 80KB RAM, 4MB external flash — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2F0a-esp8266ex_datasheet_en.pdf&ref=openhardware.directory&product=adafruit-feather-huzzah-esp8266&source=md-export) - **CP2104** (usb-serial): Silicon Labs CP2104 USB-to-UART bridge for programming at up to 921600 baud — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.silabs.com%2Fdocuments%2Fpublic%2Fdata-sheets%2Fcp2104.pdf&ref=openhardware.directory&product=adafruit-feather-huzzah-esp8266&source=md-export) - **MCP73831** (charger): Microchip MCP73831 100mA LiPo charge management IC with automatic switchover — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fww1.microchip.com%2Fdownloads%2Fen%2FDeviceDoc%2F20001984g.pdf&ref=openhardware.directory&product=adafruit-feather-huzzah-esp8266&source=md-export) ## Protocols - **UART**: TX: GPIO2, RX: GPIO3 - **SPI**: MOSI: GPIO13, MISO: GPIO12, SCK: GPIO14, SS: GPIO15 - **I2C**: SDA: GPIO4, SCL: GPIO5 - **WiFi 802.11 b/g/n** ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | GPIO0 | Digital I/O, Boot mode select (LOW=flash), Onboard red LED | — | digital-input, digital-output | | GPIO2 | Digital I/O, UART TX (Serial1), Onboard blue LED | UART | digital-input, digital-output | | GPIO4 | I2C SDA (software) | I2C | digital-input, digital-output | | GPIO5 | I2C SCL (software) | I2C | digital-input, digital-output | | GPIO12 | SPI MISO | SPI | digital-input, digital-output | | GPIO13 | SPI MOSI | SPI | digital-input, digital-output | | GPIO14 | SPI SCK | SPI | digital-input, digital-output | | GPIO15 | SPI SS (pull low at boot) | SPI | digital-input, digital-output | | GPIO16 | Digital I/O, Wake from deep sleep | — | digital-input, digital-output | | ADC | Analog Input, 0–1.0V maximum (via onboard voltage divider, accepts up to ~3.2V on this Feather) | — | analog-input | ## Available Software - **[Arduino IDE]()** (open-source) - **[NodeMCU]()** (open-source) - **[MicroPython]()** (open-source) - **[ESP-IDF]()** (open-source) ## Description ## 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. ## Where to Buy - [Adafruit](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F2821&ref=openhardware.directory&product=adafruit-feather-huzzah-esp8266&source=md-export) — 14.95 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F2821&ref=openhardware.directory&product=adafruit-feather-huzzah-esp8266&source=md-export) - [wiki](https://openhardware.directory/r?to=https%3A%2F%2Flearn.adafruit.com%2Fadafruit-feather-huzzah-esp8266&ref=openhardware.directory&product=adafruit-feather-huzzah-esp8266&source=md-export) ## Tags `feather`, `esp8266`, `wifi`, `iot`, `lipo`, `adafruit`, `huzzah`, `nodemcu` ## Images ![Adafruit Feather HUZZAH ESP8266](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-huzzah-esp8266/02f211d2b13a.jpg) ![Adafruit Feather HUZZAH ESP8266](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-huzzah-esp8266/8fc6b1f1c7a5.jpg) --- [View full device page](https://openhardware.directory/devices/adafruit-feather-huzzah-esp8266)