#define PIN_TRIG 19
#define PIN_ECHO 18
#define PIN_PIR 5

bool pir = LOW;
bool motionDetected = false;
int count = 0;

void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(PIN_PIR, INPUT);
}

void send() {
  count++;
  Serial.println(count);
}

void loop() {
  pir = digitalRead(PIN_PIR);
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  int duration = pulseIn(PIN_ECHO, HIGH);
  int cm = duration/58;

  if(pir == HIGH && cm > 0 && cm < 300) {
    if (!motionDetected) {
      send();
      Serial.println("True");
      motionDetected = true;
    }
  } else {
    motionDetected = false;
    Serial.println("False");
  }

  delay(100);
}