void setup() {
  // put your setup code here, to run once:
pinMode(trig, INPUT);
pinMode(echo, OUTPUT);
Serial.begin(9600);
lcd.begin(16, 2);
}

void loop() {
// put your main code here, to run repeatedly:
time_measurement()
distance = duration *(0.001/2);
display distance;
digitalWrite(trig, HIGH);
delay(200);
digitalWrite(trig, LOW);
delay(200);
  duration =  pulseIn(echo, HIGH);
lcd.clear();
lcd.setCursor(0,0);
Serial.print("distance in Cm: ");
Serial.print(distance);
Serial.println();
lcd.print("distance in Cm")
lcd.setcursor(5,1);
lcd.print(distance);
delay(1000);






}