Human Presence Sensor LD2410C

/*
  Canonical beginner example for the LD2410C Human Presence Sensor
  - Reads the OUT pin as a digital presence signal
  - Prints the detected state to Serial Monitor

  Wiring:
  - LD2410C VCC -> Arduino 5V
  - LD2410C GND -> Arduino GND
  - LD2410C OUT -> Arduino D2
*/

const int PRESENCE_PIN = 2;

void setup() {
  pinMode(PRESENCE_PIN, INPUT);
  Serial.begin(115200);
  while (!Serial) {
    ;
  }

  Serial.println("LD2410C human presence sensor example");
  Serial.println("Waiting for presence changes...");
}

void loop() {
  int state = digitalRead(PRESENCE_PIN);

  if (state == HIGH) {
    Serial.println("Presence detected");
  } else {
    Serial.println("No presence detected");
  }

  delay(500);
}