Seeed Xiao-form-factor board with single-core RISC-V ESP32-C3 at 160 MHz, 4 MB flash, 400 KB SRAM, 2.4 GHz Wi-Fi, BLE 5.0, USB-C, and STEMMA QT I2C connector. Operates at 3.3 V; no native USB — uses the ESP32-C3's built-in USB Serial/JTAG controller.
USB-C connector used for both powering and programming the QT Py ESP32-C3 board.
Output from the 3.3V regulator. Adafruit states these pins can supply 500mA peak.
Common ground for all power and logic.
5V output from the USB port. Adafruit also documents using the 5V pin as a protected external voltage input with a diode.
ADC1 analog input and GPIO #4.
ADC1 analog input and GPIO #3.
ADC1 analog input and GPIO #1.
ADC1 analog input and GPIO #0.
I2C clock pin, shared by the STEMMA QT connector. Adafruit notes there is no pull-up on this pin. GPIO #6.
I2C data pin, shared by the STEMMA QT connector. Adafruit notes there is no pull-up on this pin and SDA is also an ADC2 input. GPIO #5.
UART receive pin. Connect to TX on a sensor or breakout. GPIO #20.
UART transmit pin and hardware UART debug output. Connect to RX on a sensor or breakout. GPIO #21.
SPI clock pin. GPIO #10.
SPI microcontroller-in / sensor-out pin. GPIO #8.
SPI microcontroller-out / sensor-in pin.
JST SH 4-pin STEMMA QT connector I2C clock line, shared with board SCL.
JST SH 4-pin STEMMA QT connector I2C data line, shared with board SDA.
3.3V rail on the JST SH 4-pin STEMMA QT connector.
Ground on the JST SH 4-pin STEMMA QT connector.
On-board RGB NeoPixel status LED, available as board.NEOPIXEL / PIN_NEOPIXEL. Adafruit states it is on GPIO #2.
Boot button for ROM bootloader mode. Adafruit states it can also be read as GPIO 9 with input pull-up.
Reset button restarts the board and helps enter the ROM bootloader.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| USB-C port | power | USB-C connector used for both powering and programming the QT Py ESP32-C3 board. | USB 5V input | |
| 3.3V | power | Output from the 3.3V regulator. Adafruit states these pins can supply 500mA peak. | 3.3V regulated output | |
| GND | power | Common ground for all power and logic. | 0V ground reference | |
| 5V | power | 5V output from the USB port. Adafruit also documents using the 5V pin as a protected external voltage input with a diode. | 5V USB rail; external input only with diode protection per Adafruit guidance | |
| A0 | analog | ADC1 analog input and GPIO #4. | ||
| A1 | analog | ADC1 analog input and GPIO #3. | ||
| A2 | analog | ADC1 analog input and GPIO #1. | ||
| A3 | analog | ADC1 analog input and GPIO #0. | ||
| SCL | signal | I2C clock pin, shared by the STEMMA QT connector. Adafruit notes there is no pull-up on this pin. GPIO #6. | ||
| SDA | signal | I2C data pin, shared by the STEMMA QT connector. Adafruit notes there is no pull-up on this pin and SDA is also an ADC2 input. GPIO #5. | ||
| RX | signal | UART receive pin. Connect to TX on a sensor or breakout. GPIO #20. | ||
| TX | signal | UART transmit pin and hardware UART debug output. Connect to RX on a sensor or breakout. GPIO #21. | ||
| SCK | signal | SPI clock pin. GPIO #10. | ||
| MI | signal | SPI microcontroller-in / sensor-out pin. GPIO #8. | ||
| MO | signal | SPI microcontroller-out / sensor-in pin. | ||
| STEMMA QT SCL | signal | JST SH 4-pin STEMMA QT connector I2C clock line, shared with board SCL. | 3.3V logic | |
| STEMMA QT SDA | signal | JST SH 4-pin STEMMA QT connector I2C data line, shared with board SDA. | 3.3V logic | |
| STEMMA QT 3.3V | power | 3.3V rail on the JST SH 4-pin STEMMA QT connector. | 3.3V | |
| STEMMA QT GND | power | Ground on the JST SH 4-pin STEMMA QT connector. | 0V ground reference | |
| NeoPixel | signal | On-board RGB NeoPixel status LED, available as board.NEOPIXEL / PIN_NEOPIXEL. Adafruit states it is on GPIO #2. | ||
| Boot button / GPIO 9 | control | Boot button for ROM bootloader mode. Adafruit states it can also be read as GPIO 9 with input pull-up. | ||
| Reset button | control | Reset button restarts the board and helps enter the ROM bootloader. |
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