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Adafruit QT Py ESP32-C3 WiFi Dev Board with STEMMA QT

Adafruit QT Py ESP32-C3 WiFi Dev Board with STEMMA QT

The Adafruit QT Py ESP32-C3 is a compact Wi-Fi and Bluetooth LE development board built around the Espressif ESP32-C3 — a RISC-V microcontroller designed as a modern replacement for the ESP8266. In the tiny QT Py form factor (Seeed Xiao compatible), it packs USB-C, Wi-Fi, BLE 5.0, a STEMMA QT connector, and an RGB NeoPixel into a board small enough to embed anywhere.

The ESP32-C3 features a single 32-bit RISC-V core with 4 MB flash, 400 KB SRAM, and built-in USB-to-Serial (note: not native USB, so it cannot act as a keyboard or disk drive). It supports 2.4 GHz Wi-Fi and Bluetooth LE including Mesh, making it ideal for IoT projects. Program it with Arduino or MicroPython.

Key Features

  • ESP32-C3 RISC-V Core – 32-bit single-core processor with 4 MB flash and 400 KB SRAM
  • Wi-Fi 2.4 GHz – Full Wi-Fi with TLS/SSL support for secure IoT connections
  • Bluetooth LE 5.0 – Including Mesh support (not Bluetooth Classic)
  • USB-C Connector – Built-in USB-to-Serial for programming and JTAG debugging
  • STEMMA QT / Qwiic Connector – Plug-and-play I2C for sensors and accessories
  • RGB NeoPixel LED – Built-in addressable LED
  • 13 GPIO Pins – 11 on breakout pads; 5× 12-bit ADC, PWM on any pin, hardware UART, SPI, I2C, and I2S
  • 3.3 V Regulator – AP2112 with 600 mA peak output
  • Battery Input Pads – On the underside with diode protection for up to 6 V input
  • Low Power Modes – Light sleep at ~500 µA, deep sleep at ~300 µA
  • Reset & Boot Buttons – Reset switch and GPIO 9 boot button for ROM bootloader entry
  • Seeed Xiao Compatible – Same size and pinout with castellated pads for surface mounting

Also Consider

Ideal For

  • Wi-Fi connected IoT sensors and controllers
  • Bluetooth LE mesh networks
  • Compact wireless projects with STEMMA QT sensors
  • Battery-powered low-power applications
Note: The ESP32-C3 uses a RISC-V core (not Tensilica) and has built-in USB-to-Serial — not native USB. It cannot act as a USB keyboard, MIDI device, or disk drive. It does not run CircuitPython. For native USB support, consider the QT Py ESP32-S2 or ESP32-S3.

Resources

The Adafruit QT Py ESP32-C3 WiFi Dev Board with STEMMA QT appears in the following collections:

SKU AF-5405
by Adafruit