Loading source-backed pinouts…
Microcontroller
Adafruit QT Py ESP32-S3
A tiny ESP32-S3 board with STEMMA QT that is popular for CircuitPython, Arduino, and compact Wi-Fi prototypes.
Processor
ESP32-S3
Logic
3.3 V GPIO
Power
USB-C, 5 V, 3.3 V rail
Format
QT Py tiny module
Check before wiring
- Choose the PSRAM/no-PSRAM variant deliberately.
- Small pads and USB current budget can limit add-ons.
Interfaces
GPIOI2CSPIUARTADCPWMUSBWi-FiBluetooth
Source-backed connector
Interactive pin map
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.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- 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 |
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.
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