const int trigpin=2;
const int echopin=4;
float duration;
int distance;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trigpin,OUTPUT);
  pinMode(echopin,INPUT);
}

void loop() {
  digitalWrite(trigpin,LOW);
  delayMicroseconds(2);
  digitalWrite(trigpin,HIGH);
  delayMicroseconds(10);
  digitalWrite(trigpin,LOW);
  duration=pulseIn(echopin,HIGH);
  distance=duration*0.034/2;
  serial.println(distance);
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}