Adafruit QT Py ESP32-S3 WiFi Dev Board with STEMMA QT
The Adafruit QT Py ESP32-S3 packs dual-core 240 MHz processing, Wi-Fi, Bluetooth LE, and native USB into the tiny QT Py form factor. With 8 MB flash and 512 KB SRAM, it's a significant step up from the ESP32-S2 — adding a second core, BLE support, and more memory while keeping native USB for CircuitPython disk-drive mode, HID devices, and MIDI.
Program it with CircuitPython, Arduino, or ESP-IDF. The STEMMA QT / Qwiic connector gives you plug-and-play I2C access to hundreds of sensors, and the Seeed Xiao-compatible pinout with castellated pads makes it easy to embed in custom designs.
Key Features
- ESP32-S3 Dual-Core Tensilica – 240 MHz with 8 MB flash and 512 KB SRAM
- Wi-Fi 2.4 GHz – Built-in Wi-Fi for IoT connectivity
- Bluetooth LE – BLE support for wireless peripherals and mesh (no Bluetooth Classic)
- Native USB – USB keyboard/mouse HID, MIDI, serial console, and disk drive support
- USB-C Connector – For programming, power, and USB device functions
- STEMMA QT / Qwiic Connector – Plug-and-play I2C for sensors and accessories
- RGB NeoPixel LED – With controllable power pin for ultra-low-power sleep
- 13 GPIO Pins – 10× 12-bit ADC, PWM on any pin, 5× capacitive touch
- Two I2C Ports – One on breakout pads, one on STEMMA QT connector
- Hardware UART, SPI & I2S – Full peripheral support
- CircuitPython & Arduino – Full support for both platforms
- 3.3 V Regulator – AP2112 with 600 mA peak output
- Battery Input Pads – On the underside with diode protection for up to 6 V
- Low Power Modes – Light sleep at 2–4 mA, deep sleep at ~70 µA
- Seeed Xiao Compatible – Same size and pinout with castellated pads
Also Consider
- QT Py ESP32-S3 with 2 MB PSRAM – Same chip with added PSRAM for larger buffers
- QT Py ESP32-S2 – Single-core with native USB (no BLE)
- QT Py ESP32 Pico – Classic ESP32 with Bluetooth Classic + BLE (no native USB)
- QT Py ESP32-C3 – RISC-V core with Wi-Fi + BLE (lower cost, no native USB)
Ideal For
- Wi-Fi + BLE IoT projects with native USB
- CircuitPython development with wireless connectivity
- USB HID devices (keyboards, mice, MIDI controllers)
- Compact wireless sensors and controllers
- Battery-powered low-power wireless projects
Note: This version has no PSRAM. If your project requires large buffers (e.g. image processing or large JSON parsing), consider the QT Py ESP32-S3 with 2 MB PSRAM. The ESP32-S3 supports Bluetooth LE only — not Bluetooth Classic.
Resources
The Adafruit QT Py ESP32-S3 WiFi Dev Board with STEMMA QT appears in the following collections:
SKU AF-5426
by Little Bird
