#define LED_PIN D5

void setup() {
    pinMode(LED_PIN, OUTPUT);
    Serial1.begin(115200);
    digitalWrite(LED_PIN, LOW);
}

void loop() {
    if (Serial1.available()) {
        String data = Serial1.readStringUntil('\n');
        
        if (data == "DETECTED") {
            digitalWrite(LED_PIN, HIGH);
        } else if (data == "NO_PERSON") {
            digitalWrite(LED_PIN, LOW);
        }
    }
}