int trig = 7;
int echo = 6;
long timeInMicro;
int distanceInCM;

void setup() {
 Serial.begin(9600);
 pinMode(7, OUTPUT);
 pinMode(6, INPUT);
 }
 void loop() {
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
 digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
 timeInMicro = pulseIn(echo, HIGH);
distanceInCM = timeInMicro / 29 / 2;
Serial.println(distanceInCM);
 delay(100);
 }