Adafruit HUZZAH32 ESP32 Feather Board
Pinout
One grouped source record is expanded into separate logical pads where unambiguous; physical placement is not implied.
- 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 · USBVoltage · 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 · UARTVoltage · 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 · UARTVoltage · 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-A12GPIO
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 - A13VBAT sense
External analogue input A13 / GPIO35 through a resistor divider connected to the VBAT line.
Type · Analog, SignalVoltage · scaled VBAT sense input
| Pin | 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 | USB | 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 | UART | 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 | UART | 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-A12GPIO | 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 |
| A13VBAT sense | Analog, Signal | External analogue input A13 / GPIO35 through a resistor divider connected to the VBAT line. | scaled VBAT sense input |
One grouped source record is expanded into separate logical pads where unambiguous; physical placement is not implied.
Pin details
11 connections- GND
Common ground for all power and logic on the HUZZAH32 Feather.
GroundVoltage · 0V - BAT
Positive voltage to or from the JST jack for an optional LiPo battery.
PowerVoltage · LiPo battery rail - USB
Positive voltage to or from the micro USB jack when connected.
USBVoltage · 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.
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.
PowerVoltage · 3.3V output - RX
Additional Serial1 receive pin, input into the ESP32 module and not connected to the USB/serial converter.
UARTVoltage · 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.
UARTVoltage · 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.
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.
SignalVoltage · 3.3V logic, not 5V safe unless otherwise specified - A0-A12GPIO
General-purpose GPIO and analogue input pins exposed on the Feather headers, as documented by the Adafruit Learn pinout.
SignalVoltage · 3.3V logic; analogue input limits per ESP32 pinout - A13VBAT sense
External analogue input A13 / GPIO35 through a resistor divider connected to the VBAT line.
Analog, SignalVoltage · scaled VBAT sense input
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