# Adafruit HUZZAH32 ESP32 Feather Board > Adafruit's Feather-format ESP32 board with dual-core Xtensa LX6 @ 240MHz, WiFi b/g/n, Bluetooth Classic + BLE 4.2, built-in LiPo charger, and Feather-compatible pin layout. Great all-around wireless IoT platform. ## Quick Facts - **Brand:** Adafruit - **Board Type:** dev-board - **Price:** ~$19.95 - **CPU:** Xtensa LX6 dual-core @ 240MHz (ESP32) - **CPU Architecture:** Xtensa LX6 - **CPU Cores:** 2 - **RAM:** 520KB SRAM - **Flash:** 4MB - **Power:** 5V via Micro-USB or 3.7V LiPo - **Operating Voltage:** 3.3V - **Battery:** external LiPo (JST connector, any capacity) - **Antenna:** built-in PCB antenna + U.FL option ## Connectivity - **Wifi:** 802.11 b/g/n - **Bluetooth:** Bluetooth Classic + BLE 4.2 ## Compatible Firmware esp-idf, arduino, micropython, esphome, tasmota, circuitpython ## Use Cases - iot - smart-home - environmental-monitoring - home-automation ## Components - **ESP32-WROOM-32** (mcu): ESP32-WROOM-32 module with dual-core Xtensa LX6 at 240MHz, 520KB SRAM, 4MB flash, WiFi b/g/n, Bluetooth Classic + BLE 4.2 — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-wroom-32_datasheet_en.pdf&ref=openhardware.directory&product=adafruit-huzzah32-esp32-feather&source=md-export) - **MCP73831** (battery-charger): MCP73831 single-cell LiPo/Li-Ion charge management IC providing 100mA charge current with status indicator LED — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fww1.microchip.com%2Fdownloads%2Fen%2FDeviceDoc%2F20001984g.pdf&ref=openhardware.directory&product=adafruit-huzzah32-esp32-feather&source=md-export) ## Protocols - **I2C**: SDA: GPIO23, SCL: GPIO22 - **SPI**: MOSI: GPIO18, MISO: GPIO19, SCK: GPIO5 - **UART**: TX: GPIO1, RX: GPIO3 - **PWM** - **ADC**: A0: GPIO26, A1: GPIO25, A2: GPIO34, A3: GPIO39, A4: GPIO36, A5: GPIO4 ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | GPIO26 | A0 — ADC | ADC | adc, digital-input, digital-output, pwm | | GPIO25 | A1 — ADC / D25 | ADC | adc, digital-input, digital-output, pwm | | GPIO34 | A2 — ADC (input-only) | ADC | adc, input-only | | GPIO39 | A3 — ADC (input-only) | ADC | adc, input-only | | GPIO36 | A4 — ADC (input-only) | ADC | adc, input-only | | GPIO4 | A5 — ADC / D4 | ADC | adc, digital-input, digital-output, pwm | | GPIO1 | TX — UART | UART | digital-input, digital-output, pwm | | GPIO3 | RX — UART | UART | digital-input, digital-output, pwm | | GPIO5 | D5 / SPI SCK | SPI | digital-input, digital-output, pwm | | GPIO12 | D12 | GPIO | digital-input, digital-output, pwm | | GPIO13 | D13 | GPIO | digital-input, digital-output, pwm | | GPIO14 | D14 | GPIO | digital-input, digital-output, pwm | | GPIO15 | D15 | GPIO | digital-input, digital-output, pwm | | GPIO16 | D16 | GPIO | digital-input, digital-output, pwm | | GPIO17 | D17 | GPIO | digital-input, digital-output, pwm | | GPIO18 | D18 / SPI SCK | SPI | digital-input, digital-output, pwm | | GPIO19 | D19 / SPI MISO | SPI | digital-input, digital-output, pwm | | GPIO21 | D21 | GPIO | digital-input, digital-output, pwm | | GPIO22 | D22 / I2C SCL | I2C | digital-input, digital-output, pwm | | GPIO23 | D23 / I2C SDA | I2C | digital-input, digital-output, pwm | | GPIO27 | D27 | GPIO | digital-input, digital-output, pwm | | GPIO32 | D32 | GPIO | digital-input, digital-output, pwm | | GPIO33 | D33 | GPIO | digital-input, digital-output, pwm | ## Description The Adafruit HUZZAH32 is an ESP32-based Feather board — Adafruit's beloved form-factor standard — making it compatible with the entire ecosystem of Feather Wings (add-on boards). It packs dual-core WiFi + Bluetooth into the slim Feather shape, with the added convenience of a built-in 100mA LiPo charger. ## Key Features - **ESP32 dual-core** — 240MHz Xtensa LX6 with 520KB SRAM for demanding tasks - **WiFi b/g/n + Bluetooth Classic + BLE 4.2** — full wireless stack in one chip - **Built-in LiPo charger** — MCP73831 charges a 3.7V LiPo via Micro-USB; run standalone on battery - **Feather-compatible** — fits all Feather Wings; standard 28-pin layout - **U.FL antenna connector** — optional external antenna for improved range - **26 GPIO** — including 6 ADC channels, I2C, SPI, UART, and hardware PWM on most pins ## Pinout Notes GPIO34, GPIO36, and GPIO39 are input-only (no internal pull-up/down, no output drive). A0 (GPIO26) and A1 (GPIO25) are the most capable ADC pins for general use. ## Use Cases A versatile workhorse for WiFi-connected sensors, smart home devices, data loggers, and battery-powered wireless nodes. The Feather ecosystem means you can quickly add displays, GPS, LoRa, or sensor Wings without custom PCBs. ## Where to Buy - [Buy for $19.95](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F3405&ref=openhardware.directory&product=adafruit-huzzah32-esp32-feather&source=md-export) ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F3405&ref=openhardware.directory&product=adafruit-huzzah32-esp32-feather&source=md-export) - [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fadafruit%2FAdafruit-HUZZAH32-ESP32-Feather-PCB&ref=openhardware.directory&product=adafruit-huzzah32-esp32-feather&source=md-export) - [wiki](https://openhardware.directory/r?to=https%3A%2F%2Flearn.adafruit.com%2Fadafruit-huzzah32-esp32-feather&ref=openhardware.directory&product=adafruit-huzzah32-esp32-feather&source=md-export) ## Tags `esp32`, `feather`, `wifi`, `bluetooth`, `ble`, `lipo-charger`, `adafruit`, `xtensa`, `dual-core` ## Images ![Adafruit HUZZAH32 ESP32 Feather Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-huzzah32-esp32-feather/aa51ba189724.jpg) ![Adafruit HUZZAH32 ESP32 Feather Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-huzzah32-esp32-feather/77b925b1a0d9.jpg) ![Adafruit HUZZAH32 ESP32 Feather Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-huzzah32-esp32-feather/4199be441a7f.jpg) ![Adafruit HUZZAH32 ESP32 Feather Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-huzzah32-esp32-feather/f0917cec49b2.jpg) > **Battery Powered:** Li-Po --- [View full device page](https://openhardware.directory/devices/adafruit-huzzah32-esp32-feather)