int trigger =2;
int echo=3;
float distance = 0.0;
float time =0.0;
void setup() {
  pinMode(trigger,OUTPUT);
  pinMode(echo,INPUT);
  Serial.begin(9600);
}
void loop() {
digitalWrite(trigger, HIGH);
delayMicroseconds(10);
digitalWrite(trigger, LOW);
time = pulseIn(echo, HIGH);
distance = (time * 0.0343)/2;
Serial.print("distance calculated:");
Serial.println(distance);
delay(1000);
}