Adafruit QT Py S3 with 2MB PSRAM WiFi Dev Board with STEMMA QT

The Adafruit QT Py ESP32-S3 with 2 MB PSRAM is the memory-upgraded version of the QT Py ESP32-S3. With 4 MB flash, 512 KB SRAM, and 2 MB PSRAM, it can handle large data buffers — perfect for image processing, large JSON parsing, or memory-intensive CircuitPython projects that the standard version can't manage.

Built around the ESP32-S3 dual-core 240 MHz Tensilica processor with Wi-Fi, Bluetooth LE, and native USB, this tiny board can act as a USB keyboard, mouse, MIDI device, or disk drive while connecting wirelessly. Program it with CircuitPython, Arduino, or ESP-IDF, and use the STEMMA QT / Qwiic connector for plug-and-play I2C sensors.

Key Features

• ESP32-S3 Dual-Core Tensilica – 240 MHz with 4 MB flash, 512 KB SRAM, and 2 MB PSRAM
• 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 (No PSRAM) – Same chip with 8 MB flash but no PSRAM (lower cost)
• QT Py ESP32-S2 – Single-core with native USB and 2 MB PSRAM (no BLE)
• QT Py ESP32 Pico – Classic ESP32 with Bluetooth Classic + BLE and 2 MB PSRAM
• QT Py RP2040 – Dual-core ARM with PIO and 8 MB flash (no Wi-Fi)

Ideal For

• Memory-intensive CircuitPython and Arduino projects
• Wi-Fi + BLE IoT projects with native USB
• Image buffering and large data processing
• USB HID devices with wireless connectivity
• Compact embedded designs via castellated pads

Resources

• Adafruit QT Py ESP32-S3 Learning Guide