int trig=15;
int echo=4;
int buzzer=16;
int ir=5;
void setup(){
  pinMode(buzzer,OUTPUT);
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);
  pinMode(ir,INPUT);
  Serial.begin(9600);
}
void loop(){
  digitalWrite(trig,0);
  delayMicroseconds(2);
  digitalWrite(trig,1);
  delayMicroseconds(10);
  digitalWrite(trig,0);
  float duration = pulseIn(echo,1);
  duration=duration/2;
  float distance=(0.034)*duration;
  Serial.println(distance);
  int g=digitalRead(ir);
  Serial.println(g);
  if(distance<100 ||g==1){
    digitalWrite(buzzer,1);
  }
  else{
  
    digitalWrite(buzzer,0);
  }
}