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

Board
by Adafruitadafruit-qt-py-esp32-c3≈ cheap (under ~$15)
Verify my boardCompareEdit on GitHub
Adafruit QT Py ESP32-C3 WiFi Dev Board with STEMMA QT board
Board
Adafruit QT Py ESP32-C3 WiFi Dev Board with STEMMA QT pinout
Pinout

Specifications

Radiosinherited from ESP32-C3

Wi-Fi
Wi-Fi 4 · 2.4 GHz
Bluetooth LE
BLE 5
Bluetooth Classic
no
802.15.4
no

USB

Native USB
yes
Connector
usb-c

Board

Form factor
qt-py
Dimensions
22 × 17.8 mm
Battery connector
yes
Charging
no

Display & extras

Extras
rgb-ledstemma-qt
Built onAdafruit QT Py ESP32-C3 WiFi Dev Board with STEMMA QT BoardESP32-C3 SoC

Tiny ESP32-C3 board with USB-C, STEMMA QT, RGB NeoPixel, and 4 MB flash.

Firmware for this board

No firmware recipes yet — help add one.

Notes

  • 4 MB flash
  • USB-to-serial handled by the ESP32-C3's own USB-Serial/JTAG peripheral, not native USB device mode (cannot act as keyboard/disk)
  • Battery input pads on underside with diode protection for external packs up to 6V; no onboard charging circuit
  • ESP32-C3 has no PSRAM interface at all (chip datasheet lists no PSRAM/external-RAM support)
  • io.gpio_exposed=11 QUOTED: vendor page states "There are eleven GPIO pins broken out to pads."
  • io.gpio_free=10 DERIVED, not quoted (SPEC-io-power.md §5.3). Pinouts page gives explicit GPIO numbers for all 11 broken-out pads (A0=GPIO4, A1=GPIO3, A2=GPIO1, A3=GPIO0, SDA=GPIO5, SCL=GPIO6, RX=GPIO20, TX=GPIO21, SCK=GPIO10, MI=GPIO8, MO=GPIO7). Subtracting esp32-c3's soc.reserved_pins that are exposed among those 11 -- strapping {8} (1) -- gives 11 - 1 = 10. Math not vendor-stated; verify before treating as exact.
  • io.power_out QUOTED: vendor page states "These pins are the output from the 3.3V regulator, they can supply 500mA peak."

Verify my board

Reads the connected chip over USB and checks it against what esp-atlas cites for Adafruit QT Py ESP32-C3 WiFi Dev Board with STEMMA QT — over Web Serial, no backend, nothing leaves your browser.

In-browser verify needs Web Serial: Chrome or Edge on a desktop. Safari, Firefox and phones cannot do it.

Serial monitor

Not connected.