const int PINO_TRIG = 25;
const int PINO_ECHO = 27;
const int PINO_LED_INTRUSO = 26;

float obter_distancia();

void setup() {
	Serial.begin(115200);

	pinMode(PINO_TRIG, OUTPUT);
	pinMode(PINO_ECHO, INPUT);
	pinMode(PINO_LED_INTRUSO, OUTPUT);

	digitalWrite(PINO_TRIG, LOW);
};

void loop(){
	float dist = obter_distancia();

	Serial.print("Distancia: ");
	Serial.print(dist);
	Serial.println(" cm");

	if (dist > 0 && dist <= 10) {
		Serial.println("INTRUSO DETECTADO!");
		digitalWrite(PINO_LED_INTRUSO, HIGH);
		delay(1000);
	}
	else {
	Serial.println("Ambiente Seguro.");
	digitalWrite(PINO_LED_INTRUSO, LOW);
	}

	delay(3000);
};

float obter_distancia() {
	digitalWrite(PINO_TRIG, LOW);
	delayMicroseconds(2);	
	digitalWrite(PINO_TRIG, HIGH);
	delayMicroseconds(10);	
	digitalWrite(PINO_TRIG, LOW);

	long duracao = pulseIn(PINO_ECHO, HIGH, 30000);

	float distancia = (duracao / 2.0) * 0.0343;

	return distancia;
}