void setup() {
  // pinMode(12, INPUT);pinMode(15, OUTPUT);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  // int sensorValue = digitalRead(12);if (sensorValue == HIGH) { digitalWrite(15, HIGH);Serial.println("Presence detected: LED ON");} else {
    digitalWrite(15, LOW);   
    Serial.println("No presence detected: LED OFF");
  } delay (1000);
}