Adafruit QT Py S3 with 2MB PSRAM WiFi Dev Board with STEMMA QT
USB-C connector used for both powering and programming the board, per Adafruit Learn pinouts.
Output from the 3.3V regulator, can supply 600 mA peak, per Adafruit Learn pinouts.
Common ground for power and logic.
5V out from USB port; can also be used as protected voltage input with an external diode as described by Adafruit.
Back-side battery input pad paired with GND for external battery packs.
Primary I2C clock pad; not shared by the STEMMA QT connector; no onboard pull-up. Can also be capacitive touch and analogue input.
Primary I2C data pad; not shared by the STEMMA QT connector; no onboard pull-up. Can also be capacitive touch and analogue input.
UART receive pin, connect to TX on the sensor or breakout.
UART transmit pin, connect to RX on the sensor or breakout; can do capacitive touch.
SPI clock pin on the ESP32-S3 high-speed peripheral.
SPI Microcontroller In / Sensor Out pin.
SPI Microcontroller Out / Sensor In pin.
Four analogue-capable GPIO pads; A0/A1 are ADC2, A2/A3 are ADC1.
JST SH 4-pin STEMMA QT connector carrying second I2C interface SCL1, SDA1, 3.3V, and GND.
Restarts the board and helps enter the UF2 bootloader.
Used for ROM bootloader mode and can also be read as GPIO 0 input with pull-up.
| Pin | Position | 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 |
USB · 3.3 V
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.
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