const int trigPin = 7;
const int echoPin = 6;

void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600); // Start Serial Monitor
}

void loop() {
digitalWrite(trigPin, HIGH);
delayMicroseconds(2);

digitalWrite(trigPin, LOW);
delayMicroseconds(10);
digitalWrite(trigPin, HIGH);
long duration = pulseIn (echoPin, HIGH);
long distance = (duration/2)/29.1;
}