#define PIN_TRIG 15
#define PIN_ECHO 2


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
}

void loop() {
  if(Serial.available()>0){
    String command = Serial.readStringUntil('\n');
    if(command=="abstand"){
      sensor_hcsr04();
    }
  }
  delay(1000); // this speeds up the simulation
}

void sensor_hcsr04(){
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);
  float duration = pulseIn(PIN_ECHO, HIGH);
  Serial.print("Abstand in cm: ");
  Serial.println(duration / 58.8);

}