#define trigerpin 27
#define echopin 26
float distance, duration;
void san();

void setup(){
  pinMode(trigerpin, OUTPUT);
  pinMode(echopin, INPUT);
  //used to measure duration of clock pulses
  Serial.begin(115200);
  Serial.println("hello sandy");
}

void loop(){
  digitalWrite(trigerpin, LOW);
  delay(2);
  digitalWrite(trigerpin, HIGH);
  delay(10);
  digitalWrite(trigerpin, LOW);
  duration=pulseIn(echopin,HIGH);
  distance=duration/2*0.034;
  Serial.print("distance (in cm)=");
  Serial.println(distance);
  delay(1000);
  
}