Adafruit QT Py S3 with 2MB PSRAM WiFi Dev Board with STEMMA QT

The ESP32-S3 has arrived in QT Py format - and what a great way to get started with this powerful new chip from Espressif! With dual 240 MHz cores, WiFi and BLE support, and native USB, this QT Py is great for powering your IoT projects.

USB-C port
USB-C connector used for both powering and programming the board, per Adafruit Learn pinouts.
Type · power usb
3.3V
Output from the 3.3V regulator, can supply 600 mA peak, per Adafruit Learn pinouts.
Type · powerVoltage · 3.3V output
GND
Common ground for power and logic.
Type · groundVoltage · 0V
5V
5V out from USB port; can also be used as protected voltage input with an external diode as described by Adafruit.
Type · powerVoltage · 5V
BAT
Back-side battery input pad paired with GND for external battery packs.
Type · powerVoltage · 3V to 6V input
SCL

Start wiring

I2C · UART · SPI · 3.3V output · 0V

Confirm the data interface matches your host board.

Module pins: 3.3V, 5V, BAT, GND, SCL, SDA, RX, TX. Schematik maps them to your board in the app.

Related groups

4 groups

Connectors

Sort passive connector adapters from Qwiic boards, LCD modules and microSD card adapters before assuming anything with the right plug will substitute safely.

Connectors & cables · Connectors · 28 parts

Displays

Character LCDs, SPI TFTs, e-paper modules and larger capacitive-touch TFT panels solve different display jobs. Treat display class, interface, controller, resolution, touch, refresh behaviour, storage, voltage and mounting as separate swap checks.

Displays · TFT & LCD displays · 35 parts

Air quality

Choose between MQ gas sensors, VOC/eCO2 indoor-air sensors, true CO2 modules and particulate sensors without treating every air-quality breakout as the same detector.

Sensors · Gas & air-quality sensors · 31 parts

MCUs and boards

ESP32, Arduino Uno, Raspberry Pi Pico, and compatible add-on boards for running builds.

Boards · Microcontroller boards · 24 parts

Pin	Type	Function	Voltage
USB-C port	power usb	USB-C connector used for both powering and programming the board, per Adafruit Learn pinouts.
3.3V	power	Output from the 3.3V regulator, can supply 600 mA peak, per Adafruit Learn pinouts.	3.3V output
GND	ground	Common ground for power and logic.	0V
5V	power	5V out from USB port; can also be used as protected voltage input with an external diode as described by Adafruit.	5V
BAT	power	Back-side battery input pad paired with GND for external battery packs.	3V to 6V input
SCL	i2c	Primary I2C clock pad; not shared by the STEMMA QT connector; no onboard pull-up. Can also be capacitive touch and analogue input.	3.3V logic
SDA	i2c	Primary I2C data pad; not shared by the STEMMA QT connector; no onboard pull-up. Can also be capacitive touch and analogue input.	3.3V logic
RX	uart	UART receive pin, connect to TX on the sensor or breakout.	3.3V logic
TX	uart	UART transmit pin, connect to RX on the sensor or breakout; can do capacitive touch.	3.3V logic
SCK	spi	SPI clock pin on the ESP32-S3 high-speed peripheral.	3.3V logic
MI	spi	SPI Microcontroller In / Sensor Out pin.	3.3V logic
MO	spi	SPI Microcontroller Out / Sensor In pin.	3.3V logic
A0-A3	analog gpio	Four analogue-capable GPIO pads; A0/A1 are ADC2, A2/A3 are ADC1.	3.3V logic
STEMMA QT	i2c connector	JST SH 4-pin STEMMA QT connector carrying second I2C interface SCL1, SDA1, 3.3V, and GND.	3.3V
Reset button	control	Restarts the board and helps enter the UF2 bootloader.
Boot button / GPIO 0	control gpio	Used for ROM bootloader mode and can also be read as GPIO 0 input with pull-up.	3.3V logic