int trig=12;     // GPIO Pin D6
int echo=14;     //GPIO Pin D5
int time_microsec;
int time_ms;
int dist_cm;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(12,OUTPUT);
  pinMode(14,INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(trig,LOW);
delayMicroseconds(2);
digitalWrite(trig,HIGH);
delayMicroseconds(10);
digitalWrite(trig,LOW);

//pulseIn gives time in micro seconds, 1Sec= 1000000 microseconds
time_microsec= pulseIn(echo,HIGH);
time_ms=time_microsec/1000;

dist_cm= (34*time_ms)/2;

Serial.print("Time to travel: ");
Serial.println(time_ms,1);
Serial.print("ms / ");
Serial.print("Distance: ");
Serial.print(dist_cm,1);
Serial.print("cm ");

delay(2000);