The Seeed Studio XIAO ESP32C3 is a tiny programmable computer. It can switch on lights, listen to sensors, control gadgets, and even communicate using Wi-Fi and Bluetooth.
In this tutorial, we will go over its pins and what they do.
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- #2711
- 21 Oct 2026
What do the pins do?
5V - Carries 5 volts from the USB connection. It's a higher-voltage power line, not a normal signal pin.
3V3 - Supplies 3.3 volts to compatible sensors and small devices.
GND - The return path for electricity. Most circuits need a connection to GND.
D0–D10 - Can read ON/OFF signals from buttons or send signals to control LEDs and other parts.
A0–A3 - Can measure changing voltages, such as the output of certain light sensors or knobs.
SDA/SCL, TX/RX, SPI - Help the XIAO exchange messages with displays, sensors, and other electronic devices.