{"NAME":"QTPy ESP32-C3","GPIO":[1,1,1376,1,1,1,1,1,1,0,1,0,0,0,0,0,0,0,0,0,3232,3200],"FLAG":0,"BASE":1}

An ESP32-C3 dev board in the tiny (22mm x 17.9mm) Seeduino XIAO form factor.

This board uses an ESP32-C3FH4AZ chip with 4 MB of flash.

When the board is booted into debug by holding BOOT and pressing the RESET button the USB port exposes a serial connection. This can be used to easily flash new firmware.

Flashing

Flash using Tasmota Web Installer and select Tasmota ESP32-C3 option.

For esptool.py download f.e. tasmota32c3.factory.bin and run esptool.py write_flash 0x0 tasmota32c3.factory.bin

To put ESP32-C3 in flash mode GPIO8 needs to be pulled high and GPIO9 pulled low.

Device Notes

Product Guide

PCB Files

Peripherals

• WS2812B Neopixel
  • On GPIO2.
  • Provided template configures this as WS2812
• STEMMA-QT JST-SH I2C bus connector
  • On GPIO6 (SCL) and GPIO5 (SDA), on the same bus as the user pins labelled SDA/SCL on the board.
  • Provided template does not configure this bus.

GPIO Pin Mapping

The user pins labelled on the board are set up as User pins in the template, allowing module configuration. This is a quick reference to map the pin label on the board to the module user pin.

Label	GPIO
A0	GPIO4
A1	GPIO3
A2	GPIO1
A3	GPIO0
SDA	GPIO5
SCL	GPIO6
SCK	GPIO10
MISO	GPIO8
MOSI	GPIO7

The TX and RX pins (GPIO21/20) aren’t user-accessible in this template. Since they’re tied to the chip’s UART0 they are configured as Serial TX/RX instead.