Documentation

// XIAO ESP32-S3 - Blink an external LED on D0
// Board: "XIAO_ESP32S3" in the Arduino IDE (esp32 core)

#define LED_PIN D0   // GPIO1

void setup() {
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_PIN, HIGH);
  delay(250);
  digitalWrite(LED_PIN, LOW);
  delay(250);
}

// XIAO ESP32-S3 - Capacitive touch sensor on D2 (TOUCH3)
// Reading drops when the pad is touched.

#define TOUCH_PIN D2   // GPIO3 (TOUCH3)
#define LED_PIN   D0   // GPIO1

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  int v = touchRead(TOUCH_PIN);
  Serial.println(v);
  digitalWrite(LED_PIN, v < 20000 ? HIGH : LOW);
  delay(50);
}

// XIAO ESP32-S3 - Tiny HTTP server returning a status page.
// Replace YOUR_SSID / YOUR_PASS with your network credentials.

#include <WiFi.h>
#include <WebServer.h>

const char* ssid     = "YOUR_SSID";
const char* password = "YOUR_PASS";

WebServer server(80);

void handleRoot() {
  String html = "<h1>XIAO ESP32-S3</h1>";
  html += "<p>Uptime: " + String(millis() / 1000) + " s</p>";
  html += "<p>Free heap: " + String(ESP.getFreeHeap()) + " bytes</p>";
  server.send(200, "text/html", html);
}

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) { delay(250); Serial.print('.'); }
  Serial.println();
  Serial.println(WiFi.localIP());

  server.on("/", handleRoot);
  server.begin();
}

void loop() {
  server.handleClient();
}

# XIAO ESP32-S3 - MicroPython Hello World
# Flash the official MicroPython ESP32-S3 firmware first.

from machine import Pin
import time

led = Pin(1, Pin.OUT)   # D0 = GPIO1

while True:
    led.value(1)
    time.sleep_ms(250)
    led.value(0)
    time.sleep_ms(250)