const int buttonPin = D3;
int oldValue = LOW; // default/idle value for pin 8 is low.
int ledState=LOW; 

void setup() {
  Serial.begin(115200);
  pinMode(D2, OUTPUT);
  pinMode(D3, INPUT);

  Serial.println("");
  Serial.println("Hello, XIAO ESP32-C3!");
  Serial.begin(115200);
  Serial.println("Press the button.");

  // Initialize the pin for reading the button.
  pinMode(buttonPin, INPUT);
}

void loop() {

    // Read the value of pin 8.
  int newValue = digitalRead(buttonPin);

  // Check if the value was changed,
  // by comparing it with the previous value.
  if(newValue == HIGH && oldValue==LOW){
     ledState= !ledState;
     digitalWrite(D2, ledState);
    if( ledState == HIGH ){
      Serial.println("Red");
      }else{
      Serial.println("The device is turned off.");
      }
    }
    oldValue=newValue;
  }