ultrasonic obstracle avoider car.ino

//www.edisonsciencecorner.blogspot.com
//www.edisonsciencecorner.blogspot.com
//www.edisonsciencecorner.blogspot.com
//www.edisonsciencecorner.blogspot.com


const int trig = A4;
const int echo = A5;
const int leftForward = 2;
const int leftBackward = 3;
const int rightForward = 4;
const int rightBackward = 5;
int led=13;
int A=10;
int B= 11;


int duration = 0;
int distance = 0;

void setup() 
{
  pinMode(13, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(trig , OUTPUT);
  pinMode(echo , INPUT);
  pinMode(leftForward , OUTPUT);
  pinMode(leftBackward , OUTPUT);
  pinMode(rightForward , OUTPUT);
  pinMode(rightBackward , OUTPUT);
  
  Serial.begin(9600);

}

void loop()
{
  digitalWrite(10, HIGH);
  digitalWrite(11, HIGH);
  digitalWrite(trig , HIGH);
  delayMicroseconds(1000);
  digitalWrite(trig , LOW);


  duration = pulseIn(echo , HIGH);
  distance = (duration/2) / 28.5 ;
  Serial.println(distance);
  

  if ( distance < 10 )
  { digitalWrite(led ,HIGH);
    digitalWrite(leftForward , LOW);
    digitalWrite(leftBackward , HIGH);
    digitalWrite(rightForward , HIGH);
    digitalWrite(rightBackward , LOW);
    delay(100);
  }
  else
  { digitalWrite(led ,LOW);
    digitalWrite(leftForward , HIGH);
    digitalWrite(leftBackward , LOW);
    digitalWrite(rightForward , HIGH);
    digitalWrite(rightBackward , LOW);
  }
 
}