How to Use XIAO ESP32 C3: Examples, Pinouts, and Specs

The XIAO ESP32 C3 is a compact and powerful microcontroller board developed by Seeed Studio, featuring the ESP32-C3 chip. This board is designed for IoT (Internet of Things) applications, offering built-in Wi-Fi and Bluetooth Low Energy (BLE) capabilities. Its small form factor and robust performance make it ideal for projects requiring wireless connectivity, such as smart home devices, wearables, and remote monitoring systems.

• IoT devices and smart home automation
• Wearable electronics
• Wireless sensor networks
• Remote data logging and monitoring
• Prototyping for Wi-Fi and BLE-enabled projects

The following table outlines the key technical details of the XIAO ESP32 C3:

The XIAO ESP32 C3 features a total of 11 GPIO pins, which are multifunctional and can be configured for various purposes. Below is the pinout description:

1. Powering the Board:

   • Use a USB-C cable to power the board via a 5V USB power source.
   • Alternatively, supply 3.3V directly to the 3V3 pin.

2. Connecting Peripherals:

   • Use the GPIO pins for interfacing with sensors, actuators, or other devices.
   • Configure the pins as input or output in your code, depending on the application.

3. Programming the Board:

   • Install the Arduino IDE and add the ESP32 board package.
   • Select "ESP32C3 Dev Module" as the board in the Arduino IDE.
   • Connect the board to your computer via USB-C and upload your code.

• Ensure the input voltage does not exceed the specified range to avoid damaging the board.
• Use level shifters if interfacing with devices operating at different voltage levels.
• Avoid drawing excessive current from the GPIO pins (maximum 40 mA per pin).
• Use pull-up or pull-down resistors for stable input signals when required.

Below is an example of using the XIAO ESP32 C3 to read an analog sensor and send data over Wi-Fi:

#include <WiFi.h> // Include the Wi-Fi library

// Replace with your Wi-Fi credentials
const char* ssid = "Your_SSID";
const char* password = "Your_PASSWORD";

void setup() {
  Serial.begin(115200); // Initialize serial communication
  pinMode(2, INPUT);    // Set GPIO2 (D2) as input for the sensor

  // Connect to Wi-Fi
  Serial.print("Connecting to Wi-Fi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to Wi-Fi");
}

void loop() {
  int sensorValue = analogRead(2); // Read analog value from GPIO2
  Serial.print("Sensor Value: ");
  Serial.println(sensorValue);

  delay(1000); // Wait for 1 second before the next reading
}

1. The board is not detected by the computer:

   • Ensure the USB-C cable is a data cable, not just a charging cable.
   • Check if the correct drivers for the ESP32-C3 are installed on your computer.

2. Wi-Fi connection fails:

   • Double-check the SSID and password in your code.
   • Ensure the Wi-Fi network is operating on the 2.4 GHz band (not 5 GHz).

3. Code upload fails:

   • Verify that the correct board and port are selected in the Arduino IDE.
   • Press and hold the reset button while uploading the code.

Q: Can I power the XIAO ESP32 C3 with a battery?
A: Yes, you can use a 3.7V LiPo battery with a suitable voltage regulator to supply 3.3V to the 3V3 pin.

Q: Does the board support OTA (Over-The-Air) updates?
A: Yes, the ESP32-C3 chip supports OTA updates, which can be implemented in your code.

Q: What is the maximum range of the Wi-Fi and BLE?
A: The range depends on environmental factors, but typically Wi-Fi can reach up to 50 meters indoors and BLE up to 10 meters.

This concludes the documentation for the XIAO ESP32 C3.