#define triggerPin 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(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(speakerPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);  
  digitalWrite(triggerPin, 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);
  }

}