#include "NewPing.h"

#define in4 10

#define in3 8

#define enb 11


#define in2 7

#define in1 5

#define ena 3


#define TRIGGER_PIN 13

#define ECHO_PIN 12

#define MAX_DISTANCE 400

#define ledvebuzzer 2



NewPing sonar(TRIGGER_PIN,ECHO_PIN,MAX_DISTANCE);

float duration,distance;





void setup() {
  
pinMode(in1,OUTPUT);
  
pinMode(in2,OUTPUT);
  
pinMode(ena,OUTPUT);
  
pinMode(in3,OUTPUT);
  
pinMode(in4,OUTPUT);
  
pinMode(enb,OUTPUT);
pinMode(ledvebuzzer,OUTPUT);

}



void loop() {



distance=sonar.ping_cm();

if(distance <31){
 //digitalWrite(ledvebuzzer,HIGH);

engel();

}
else
{
  
digitalWrite(ledvebuzzer,LOW);
  

}

git();


}





void engel(){
  analogWrite(ena,0);
analogWrite(enb,0);delay(1000);
}



void git(){

digitalWrite(in1,LOW);

digitalWrite(in2,HIGH);

analogWrite(ena,255);

digitalWrite(in3,HIGH);

digitalWrite(in4,LOW);

analogWrite(enb,255);  
}