#define PIN_TRIG 0
#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"){
      ultraschall();
    }
  }
  delay(1000); 
}

void ultraschall(){
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);
  int duration = pulseIn(PIN_ECHO, HIGH);
  Serial.print("Distanz in Zentimeter: ");
  Serial.println(duration / 58);
  Serial.print("Distanz in Zoll: ");
  Serial.println(duration / 148);
}