const int trigPin =25;
const int echoPin =26;
const int ledPin =4;
const int buzzerPin=5;
long duration;
int distance;

void setup() {
  
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin,OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() 
{
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);

  digitalWrite(trigPin,LOW);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);

  distance = duration * 0.034 / 2;
  Serial.print("Distance=");
  Serial.print(distance);
  Serial.println(" cm");

  delay(1000);
  if(distance<200)
  {
    digitalWrite(ledPin, HIGH);
    digitalWrite(buzzerPin,HIGH);
  }
  else
  {
    digitalWrite(ledPin, LOW);
    digitalWrite(buzzerPin,LOW);
  }
}