Loading source-backed pinouts…
Microcontroller
Adafruit QT Py ESP32-S3
Tiny ESP32-S3 board with STEMMA QT, popular for CircuitPython and compact Wi-Fi prototypes.
- GPIO
- I2C
- SPI
- UART
- ADC
- PWM
- USB
- Wi-Fi
- Bluetooth
- Processor
- ESP32-S3
- Logic
- 3.3 V GPIONot 5 V tolerant
- Power
- USB-C, 5 V, 3.3 V rail
- Format
- QT Py tiny module
Before you wire
2 cautions- Choose the PSRAM/no-PSRAM variant deliberately.
- Small pads and USB current budget can limit add-ons.
Pin map
Connector
QT Py 14 castellated pads (Seeed XIAO footprint)
USB-C at top, component side up, 7 pads down each long edge
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Pin
Hover, tap, or arrow to a pad to inspect it.
- USB-C at top, component side up; QT Py footprint matches Seeed XIAO.
- GPIO is 3.3 V only and is not 5 V tolerant.
- SDA (GPIO7) / SCL (GPIO6) are the breakout pads; the onboard STEMMA QT connector is a second I2C on SDA1 (GPIO41) / SCL1 (GPIO40). NeoPixel is on GPIO39, BOOT button on GPIO0.
- Left pads 1-7 top-to-bottom; right pads 8-14 continuing around the board.
All 14 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | ADC | GPIO18 | ||
| 2 | ADC | GPIO17 | ||
| 3 | ADC | GPIO9 | ||
| 4 | ADC | GPIO8 | ||
| 5 | I2C | I2C | GPIO7 | |
| 6 | I2C | I2C | GPIO6 | |
| 7 | UART | UART | GPIO5 | |
| 14 | Power | 5V | USB 5 V | |
| 13 | Ground | GND | ||
| 12 | Power | 3V3 | ||
| 11 | SPI | SPI | GPIO35 | |
| 10 | SPI | SPI | GPIO37 | |
| 9 | SPI | SPI | GPIO36 | |
| 8 | UART | UART | GPIO16 |
Revision notes
- Choose the PSRAM/no-PSRAM variant deliberately.
Source references
Why it matters
- Adafruit Learn has a dedicated pinouts page.
- STEMMA QT reduces wiring for I2C sensors.
- Tiny board fits quick demos and product-like prototypes.
Similar boards
Adafruit ESP32-S3 Feathersame microcontroller platform · both support Wi-FiAdafruit Feather M4 Expresssame microcontroller class · same microcontroller platformAdafruit Feather nRF52840 Expresssame microcontroller platform · both support BluetoothAdafruit Feather RP2040same microcontroller class · same microcontroller platform