#define ledpin D13
const int trigpin = 14;
const int echopin=15;
long duration ;
float distance;
void setup()
{
  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);
  pinMode(ledpin, OUTPUT);
  Serial.begin(9600); //red led
}
void loop()
{
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(2);
  digitalWrite(trigpin, LOW);
  delayMicroseconds(10);
  duration=pulseIn(echopin,HIGH);
  distance=duration*0.034/2;
  Serial.print("DISTANCE :");
  Serial.print(distance);
  Serial.println(" Cm");
  digitalWrite(ledpin, HIGH);
  delay(1000);
  digitalWrite(ledpin, LOW);
  delay(1000);
}