#include <TouchSensorLib.h>

TouchSensor touch(D9);  // D9 on XIAO
int ledPin = D1;         // D1 on XIAO

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

void loop() {
  touch.update();  // always call this first

  if (touch.isTouched()) {
    digitalWrite(ledPin, HIGH);  // LED ON while touching
  } else {
    digitalWrite(ledPin, LOW);   // LED OFF when not touching
  }
}