Assembled Adafruit HUZZAH32 – ESP32 Feather Board
Aww yeah, it's the Feather you have been waiting for, and now with stacking headers! The HUZZAH32 is our ESP32-based Feather, made with the official WROOM32 module.
Pinout
- GND
Common ground for all power and logic on the HUZZAH32 Feather.
Type · groundVoltage · 0V - BAT
Positive voltage to or from the JST jack for an optional LiPo battery.
Type · powerVoltage · LiPo battery rail - USB
Positive voltage to or from the micro USB jack when connected.
Type · powerVoltage · USB supply rail - EN
3.3V regulator enable. Adafruit Learn states it is pulled up and can be connected to ground to disable the regulator.
Type · controlVoltage · 3.3V enable control - 3V
Output from the 3.3V regulator. Adafruit Learn notes the regulator can supply 500mA peak, with the ESP32 drawing part of that budget.
Type · powerVoltage · 3.3V output - RX
Additional Serial1 receive pin, input into the ESP32 module and not connected to the USB/serial converter.
Type · signalVoltage · 3.3V logic, not 5V safe unless otherwise specified - TX
Additional Serial1 transmit pin, output from the ESP32 module and not connected to the USB/serial converter.
Type · signalVoltage · 3.3V logic, not 5V safe unless otherwise specified - I2C pins
ESP32 I2C interface pins for sensors and peripherals. Adafruit Learn notes the I2C pins do not include onboard pullups.
Type · signalVoltage · 3.3V logic, external pullups required for I2C - SPI pins
ESP32 SPI interface pins for sensors, outputs, and peripherals using the standard SPI library.
Type · signalVoltage · 3.3V logic, not 5V safe unless otherwise specified - A0-A12 / GPIO
General-purpose GPIO and analogue input pins exposed on the Feather headers, as documented by the Adafruit Learn pinout.
Type · signalVoltage · 3.3V logic; analogue input limits per ESP32 pinout - A13 / VBAT sense
External analogue input A13 / GPIO35 through a resistor divider connected to the VBAT line.
Type · signalVoltage · scaled VBAT sense input
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| GND | ground | Common ground for all power and logic on the HUZZAH32 Feather. | 0V | |
| BAT | power | Positive voltage to or from the JST jack for an optional LiPo battery. | LiPo battery rail | |
| USB | power | Positive voltage to or from the micro USB jack when connected. | USB supply rail | |
| EN | control | 3.3V regulator enable. Adafruit Learn states it is pulled up and can be connected to ground to disable the regulator. | 3.3V enable control | |
| 3V | power | Output from the 3.3V regulator. Adafruit Learn notes the regulator can supply 500mA peak, with the ESP32 drawing part of that budget. | 3.3V output | |
| RX | signal | Additional Serial1 receive pin, input into the ESP32 module and not connected to the USB/serial converter. | 3.3V logic, not 5V safe unless otherwise specified | |
| TX | signal | Additional Serial1 transmit pin, output from the ESP32 module and not connected to the USB/serial converter. | 3.3V logic, not 5V safe unless otherwise specified | |
| I2C pins | signal | ESP32 I2C interface pins for sensors and peripherals. Adafruit Learn notes the I2C pins do not include onboard pullups. | 3.3V logic, external pullups required for I2C | |
| SPI pins | signal | ESP32 SPI interface pins for sensors, outputs, and peripherals using the standard SPI library. | 3.3V logic, not 5V safe unless otherwise specified | |
| A0-A12 / GPIO | signal | General-purpose GPIO and analogue input pins exposed on the Feather headers, as documented by the Adafruit Learn pinout. | 3.3V logic; analogue input limits per ESP32 pinout | |
| A13 / VBAT sense | signal | External analogue input A13 / GPIO35 through a resistor divider connected to the VBAT line. | scaled VBAT sense input |
Start wiring
UART · 0V · LiPo battery rail
Confirm the data interface matches your host board.
Module pins: BAT, USB, 3V, GND, RX, TX, I2C pins, SPI pins. Schematik maps them to your board in the app.
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