Adafruit QT Py S3 with 2MB PSRAM WiFi Dev Board with STEMMA QT
One grouped connection is listed in the table but omitted from the graphic until individual pins are available.
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 | Type | Function | Voltage |
|---|---|---|---|
| USB-C port | 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 | Four analogue-capable GPIO pads; A0/A1 are ADC2, A2/A3 are ADC1. | 3.3V logic |
| STEMMA QT | I2C | 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 buttonGPIO 0 | GPIO, Control | Used for ROM bootloader mode and can also be read as GPIO 0 input with pull-up. | 3.3V logic |
One grouped connection is omitted from the graphic until individual pins are available.
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.
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.
Wi-Fi and Bluetooth on a single chip, in every shape from Espressif DevKitC to Adafruit Feathers with STEMMA QT, DFRobot FireBeetles tuned for battery life, and Seeed XIAOs under a thumbnail.
10 I/Os Relay Module - CPU ESP32 (Relay Output) visual preview10 I/Os Relay Module - CPU ESP32 (Relay Output)
Adafruit ESP32 Feather V2 w.FL Antenna - 8MB Flash + 2MB PSRAM visual previewAdafruit ESP32 Feather V2 w.FL Antenna - 8MB Flash + 2MB PSRAM
Adafruit ESP32-C6 Feather - STEMMA QT visual previewAdafruit ESP32-C6 Feather - STEMMA QT
Adafruit ESP32-S2 Feather - 4MB Flash + 2MB PSRAM visual previewAdafruit ESP32-S2 Feather - 4MB Flash + 2MB PSRAM
Adafruit ESP32-S2 Feather with BME280 Sensor - STEMMA QT visual previewAdafruit ESP32-S2 Feather with BME280 Sensor - STEMMA QT
Adafruit ESP32-S3 Feather 8MB with w.FL Antenna visual previewAdafruit ESP32-S3 Feather 8MB with w.FL Antenna
Adafruit Feather HUZZAH with ESP8266 WiFi visual previewAdafruit Feather HUZZAH with ESP8266 WiFi
Adafruit HUZZAH ESP8266 Breakout visual previewAdafruit HUZZAH ESP8266 Breakout
Adafruit HUZZAH32 – ESP32 Breakout Board visual previewAdafruit HUZZAH32 – ESP32 Breakout Board
Adafruit HUZZAH32 ESP32 Feather Board visual previewAdafruit HUZZAH32 ESP32 Feather Board
Adafruit Metro ESP32-S3 with 16MB Flash 8MB PSRAM visual previewAdafruit Metro ESP32-S3 with 16MB Flash 8MB PSRAM
Adafruit Metro M4 Express AirLift (WiFi) - Lite visual previewAdafruit Metro M4 Express AirLift (WiFi) - Lite
10 I/Os PLC Module - CPU Arduino Nano (Optoisolated Output) visual previewAbout 75 boards across every Arduino generation: 5V Uno/Mega/GIGA, 3.3V MKR and Portenta, plus DFRduino and Bluno compatibles. Confirm the voltage rail before stacking any shield.
Boards · Arduino boards · 77 parts
15x7 CharliePlex LED Matrix FeatherWing - Cool White visual previewAbout 270 add-ons across Pi HATs, Arduino shields, and FeatherWings. The same function — motor control, PoE, display — usually ships once per host connector family. Get the host board right first.
Boards · HATs, Shields & add-ons · 270 parts
16-Ch Servo Driver Breakout for micro:bit, I2C visual previewSpecialists: Teensy for high-clock audio and USB, Adafruit SAMD boards running CircuitPython or the Arduino IDE, proper STM32 eval kits, and the micro:bit classroom ecosystem. Schematik builds target ESP32, Arduino Uno, and Pico; come here when you have a specific reason to.
Boards · Other MCU boards · 229 parts
Adafruit DVI Breakout Board for HDMI Source Devices visual previewThe Raspberry Pi MCU line — Pico, Pico 2, and third-party boards on the same silicon — plus a deep bench of Pico-pinout displays, loggers, and radio modules that do nothing without a Pico plugged in.
Boards · Pico & RP2040 boards · 43 parts