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

Part Number: AF-5405/02


This miniature dev board is perfect for small projects: it comes with the STEMMA QT, a chainable I2C port, WiFi, Bluetooth LE, and plenty of FLASH and RAM memory for many IoT projects. This diminutive dev board comes with a RISC-V IoT microcontroller, the ESP32-C3!

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ESP32-C3 is a low-cost microcontroller from Espressif that supports 2.4 GHz Wi-Fi and Bluetooth® Low Energy (Bluetooth LE). It has built-in USB-to-Serial, but not native USB – it cannot act as a keyboard or disk drive. The chip used here has 4MB of Flash memory, 400 KB of SRAM and can easily handle TLS connections.

The ESP32-C3 integrates a rich set of peripherals, ranging from UART, I2C, I2S, remote control peripheral, LED PWM controller, general DMA controller, TWAI controller, USB Serial/JTAG controller, temperature sensor, and ADC. It also includes SPI, Dual SPI, and Quad SPI interfaces. There is no DAC or native capacitive touch.

There’s a minimum number of pins on this chip, it’s specifically designed to be low cost and for simpler projects than ESP32-Sx or ESP32 classics with their large number of GPIO. Think of it more as an intended replacement to the ESP8266 than to the ESP32!

With its state-of-the-art power and RF performance, this SoC is an ideal choice for a wide variety of application scenarios relating to the Internet of Things (IoT), wearable electronics, and smart homes.

Please note: The C3 uses RISC V as a core, not Tensilica, and has Bluetooth LE (not classic!). The BLE core supports BT version 5 including Mesh.


  • ESP32-C3 32­-bit RISC­-V single­ core processor with 4MB of Flash memory, 400 KB of SRAM
  • USB Type C connector
  • Built in USB-to-Serial inside the chip, which can also be used for JTAG programming. This peripheral is not native serial, so not for USB HID, MIDI or MSC: it does reduce cost since a separate converter isnt needed
  • Can be used with Arduino IDE or MicroPython
  • Built-in RGB NeoPixel LED note that due the small number of GPIO, we could not add a NeoPixel power pin
  • Battery input pads on underside with diode protection for external battery packs up to 6V input
  • 13 GPIO pins:
    • 11 on breakout pads
    • 5 x 12-bit analog inputs on A0 thru A3 and SDA pin
    • PWM outputs on any pin
    • I2C port, on the breakout pads shared with the STEMMA QT plug-n-play connector
    • Hardware UART which is also the hardware serial debug port
    • Hardware SPI
    • Hardware I2S on any pins
  • 3.3V regulator with 600mA peak output
  • Light sleep at 500uAdeep sleep at ~300uA. Lower power deep-sleep is not possible because we don’t have an extra GPIO for disabling the NeoPixel power and we didn’t want to share that with any of the IO pads. An engineering trade-off!
  • Reset switch for starting your project code over, boot 9 button for entering bootloader mode

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