Adafruit QT Py ESP32-S3 WiFi Dev Board with STEMMA QT

Seeed Xiao-form-factor board with dual-core ESP32-S3 at 240 MHz, 8 MB flash, 512 KB SRAM, 2.4 GHz Wi-Fi, BLE, native USB-C, and STEMMA QT I2C connector. Operates at 3.3 V. Choose this over the S2 variant when Bluetooth is needed.

Logical pinout · physical placement not verified

USB-C port
USB-C connector used for powering and programming the QT Py ESP32-S3 board.
Type · PowerVoltage · USB 5V input from a USB-C cable
3.3V
Output from the on-board 3.3V regulator. Adafruit states these pins can supply 600mA peak.
Type · PowerVoltage · 3.3V regulated output
GND
Common ground for all power and logic on the board.
Type · GroundVoltage · 0V ground reference
5V
5V output from the USB port. Adafruit also documents using the 5V pin as a protected external voltage input with a diode between the source and the pin.
Type · PowerVoltage · 5V USB rail; external input only with diode protection per Adafruit guidance
BAT
Back-side battery input pad paired with GND for external battery packs.
Type · PowerVoltage · 3V to 6V battery input per Adafruit pinouts page
A0
GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs.
Type · Analog
A1
GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs.
Type · Analog
A2
GPIO/analog input pad. Adafruit states A2 can also do capacitive touch.
Type · Analog
A3
GPIO/analog input pad. Adafruit states A3 can also do capacitive touch.
Type · Analog
SCL
Main I2C clock pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input.
Type · I2C
SDA
Main I2C data pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input.
Type · I2C
RX
UART receive pin. Connects to the transmit pin on a sensor or breakout.
Type · UART
TX
UART transmit pin. Connects to the receive pin on a sensor or breakout. Adafruit notes TX can also do capacitive touch.
Type · UART
SCK
SPI clock pin on the ESP32-S3 high-speed peripheral.
Type · SPI
MI
SPI microcontroller-in / sensor-out pin.
Type · Signal
MO
SPI microcontroller-out / sensor-in pin.
Type · Signal
STEMMA QT SCL1
JST SH 4-pin STEMMA QT connector clock line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND.
Type · SignalVoltage · 3.3V logic on STEMMA QT connector
STEMMA QT SDA1
JST SH 4-pin STEMMA QT connector data line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND.
Type · SignalVoltage · 3.3V logic on STEMMA QT connector
STEMMA QT 3.3V
3.3V rail on the JST SH STEMMA QT connector.
Type · PowerVoltage · 3.3V
STEMMA QT GND
Ground on the JST SH STEMMA QT connector.
Type · PowerVoltage · 0V ground reference
Boot buttonGPIO 0
Boot/DFU button. Adafruit states it can put the board into ROM bootloader mode and can be read as GPIO 0 with input pull-up.
Type · GPIO, Control
Reset button
Reset button restarts the board and helps enter the UF2 bootloader when tapped during the NeoPixel status LED boot indication.
Type · Control

Pin	Type	Function	Voltage
USB-C port	Power	USB-C connector used for powering and programming the QT Py ESP32-S3 board.	USB 5V input from a USB-C cable
3.3V	Power	Output from the on-board 3.3V regulator. Adafruit states these pins can supply 600mA peak.	3.3V regulated output
GND	Ground	Common ground for all power and logic on the board.	0V ground reference
5V	Power	5V output from the USB port. Adafruit also documents using the 5V pin as a protected external voltage input with a diode between the source and the pin.	5V USB rail; external input only with diode protection per Adafruit guidance
BAT	Power	Back-side battery input pad paired with GND for external battery packs.	3V to 6V battery input per Adafruit pinouts page
A0	Analog	GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs.
A1	Analog	GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs.
A2	Analog	GPIO/analog input pad. Adafruit states A2 can also do capacitive touch.
A3	Analog	GPIO/analog input pad. Adafruit states A3 can also do capacitive touch.
SCL	I2C	Main I2C clock pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input.
SDA	I2C	Main I2C data pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input.
RX	UART	UART receive pin. Connects to the transmit pin on a sensor or breakout.
TX	UART	UART transmit pin. Connects to the receive pin on a sensor or breakout. Adafruit notes TX can also do capacitive touch.
SCK	SPI	SPI clock pin on the ESP32-S3 high-speed peripheral.
MI	Signal	SPI microcontroller-in / sensor-out pin.
MO	Signal	SPI microcontroller-out / sensor-in pin.
STEMMA QT SCL1	Signal	JST SH 4-pin STEMMA QT connector clock line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND.	3.3V logic on STEMMA QT connector
STEMMA QT SDA1	Signal	JST SH 4-pin STEMMA QT connector data line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND.	3.3V logic on STEMMA QT connector
STEMMA QT 3.3V	Power	3.3V rail on the JST SH STEMMA QT connector.	3.3V
STEMMA QT GND	Power	Ground on the JST SH STEMMA QT connector.	0V ground reference
Boot buttonGPIO 0	GPIO, Control	Boot/DFU button. Adafruit states it can put the board into ROM bootloader mode and can be read as GPIO 0 with input pull-up.
Reset button	Control	Reset button restarts the board and helps enter the UF2 bootloader when tapped during the NeoPixel status LED boot indication.

Logical pinout · physical placement not verified

Pin details

22 connections

USB-C port
USB-C connector used for powering and programming the QT Py ESP32-S3 board.
PowerVoltage · USB 5V input from a USB-C cable
3.3V
Output from the on-board 3.3V regulator. Adafruit states these pins can supply 600mA peak.
PowerVoltage · 3.3V regulated output
GND
Common ground for all power and logic on the board.
GroundVoltage · 0V ground reference
5V
5V output from the USB port. Adafruit also documents using the 5V pin as a protected external voltage input with a diode between the source and the pin.
PowerVoltage · 5V USB rail; external input only with diode protection per Adafruit guidance
BAT
Back-side battery input pad paired with GND for external battery packs.
PowerVoltage · 3V to 6V battery input per Adafruit pinouts page
A0
GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs.
Analog
A1
GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs.
Analog
A2
GPIO/analog input pad. Adafruit states A2 can also do capacitive touch.
Analog
A3
GPIO/analog input pad. Adafruit states A3 can also do capacitive touch.
Analog
SCL
Main I2C clock pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input.
I2C
SDA
Main I2C data pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input.
I2C
RX
UART receive pin. Connects to the transmit pin on a sensor or breakout.
UART
TX
UART transmit pin. Connects to the receive pin on a sensor or breakout. Adafruit notes TX can also do capacitive touch.
UART
SCK
SPI clock pin on the ESP32-S3 high-speed peripheral.
SPI
MI
SPI microcontroller-in / sensor-out pin.
Signal
MO
SPI microcontroller-out / sensor-in pin.
Signal
STEMMA QT SCL1
JST SH 4-pin STEMMA QT connector clock line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND.
SignalVoltage · 3.3V logic on STEMMA QT connector
STEMMA QT SDA1
JST SH 4-pin STEMMA QT connector data line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND.
SignalVoltage · 3.3V logic on STEMMA QT connector
STEMMA QT 3.3V
3.3V rail on the JST SH STEMMA QT connector.
PowerVoltage · 3.3V
STEMMA QT GND
Ground on the JST SH STEMMA QT connector.
PowerVoltage · 0V ground reference
Boot buttonGPIO 0
Boot/DFU button. Adafruit states it can put the board into ROM bootloader mode and can be read as GPIO 0 with input pull-up.
GPIO, Control
Reset button
Reset button restarts the board and helps enter the UF2 bootloader when tapped during the NeoPixel status LED boot indication.
Control

ESP32

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