#define trigerpin 13
#define echopin 12
#define ledpin 2
#define  speakerpin  10
#define pitch 262

double duration , distance;



void setup() {
  // put your setup code here, to run once:
  pinMode(trigerpin, OUTPUT);
  pinMode(echopin, INPUT);
  pinMode(ledpin, OUTPUT);  
  pinMode(speakerpin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigerpin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigerpin, HIGH);
  delayMicroseconds(12);
  digitalWrite(trigerpin, LOW);
  delayMicroseconds(2);


  duration = pulseIn(echopin, HIGH);
  distance = (duration / 2) * 0.0343;

  if(distance < 200) {
    digitalWrite(ledpin, HIGH);
    tone(speakerpin, pitch);
    delay(300);
    digitalWrite(ledpin, LOW);
    noTone(speakerpin);
    delay(300);
  } else {
    digitalWrite(ledpin, LOW);
    noTone(speakerpin);
  }
  
}