#define trigerPin 12
#define echoPin 13
#define ledPin 2
#define bulbPin 3
#define speakerPin 10
#define pitch 262

double duration, distance;

void setup() {
  Serial.begin(9600);
  pinMode(trigerPin,OUTPUT);
  pinMode(echoPin,INPUT);
  pinMode(bulbPin,OUTPUT);
  pinMode(ledPin,OUTPUT);
  pinMode(speakerPin,OUTPUT);
}

void loop() {
  digitalWrite(trigerPin,LOW);
  delayMicroseconds(2);
  digitalWrite(trigerPin,HIGH);
  delayMicroseconds(10);
  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);
    digitalWrite(bulbPin, HIGH);
    delay(300);
    digitalWrite(bulbPin, LOW);
    delay(300);
    noTone(speakerPin);
  }
}