int trig = 13;
int echo = 12;
int duration;
int distance;
void setup() {
Serial.begin(9600);
pinMode(trig, OUTPUT);
pinMode(echo, INPUT);
}
void loop() {
digitalWrite(trig, 0);
delayMicroseconds(1);
digitalWrite(trig, 1);
delayMicroseconds(10);
digitalWrite(trig, 0);
duration = pulseIn(echo, 1); // in Microseconds
distance = duration * 0.034 / 2;
Serial.print("Distance in CM: ");
Serial.println(distance);
}