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

One of my favourite boards for wearable tech — the Adafruit QT Py ESP32-C3 packs WiFi, Bluetooth LE, and a chainable STEMMA QT I2C connector into a board barely larger than a postage stamp.

The STEMMA QT connector is the real star: plug in any compatible sensor or display with a cable — no soldering needed. Chain multiple I2C devices together for complex builds without the wiring headache. Compatible with SparkFun Qwiic and Seeed Grove (with adapter).

The board is Seeed Xiao-compatible in size and pinout, with castellated pads for easy embedding into projects.

Key Features

• ESP32-C3 RISC-V 32-bit @ up to 160MHz, 4MB Flash, 400KB SRAM
• WiFi 802.11b/g/n (2.4GHz) + Bluetooth 5 LE & Mesh
• STEMMA QT / Qwiic connector — chainable, solder-free I2C
• Built-in RGB NeoPixel LED
• USB-C with built-in USB-to-Serial (not native USB — no HID/MIDI/MSC)
• Battery input pads (up to 6V, diode protected)
• 13 GPIO: analog in, PWM, I2C, SPI, UART, I2S
• Deep sleep ~300µA | Light sleep ~500µA
• Reset button + GPIO 9 boot button
• Arduino IDE & MicroPython compatible

Specs

• Size: 22.0 × 17.8 × 5.7mm | Weight: 2.1g
• 3.3V regulator, 600mA peak output

Note

The C3 uses a RISC-V core (not Tensilica) and Bluetooth LE only (not Classic). CircuitPython support is basic and does not include BLE at this time. Not a drop-in replacement for ESP32 classic — think of it as a capable ESP8266 successor.

Related products

• Complete the plug-and-play experience with a STEMMA QT / Qwiic Cable.
• Want the same tiny form factor without WiFi? Try the QT Py SAMD21.
• Need onboard Li-ion charging? Check out the Beetle ESP32-C3.