const int ledPin0 = 0;
const int ledPin1 = 1;
const int ledPin2 = 2;
const int ledPin3 = 4;
const int ledPin4 = 3;

const int trigPin = 27;
const int echoPin = 28;
const int LP = 16;

// defines variables
double duration;
double distance;
 

 
void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  pinMode(LP,OUTPUT); //LED
   pinMode(ledPin0, OUTPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
   pinMode(ledPin3, OUTPUT);
  pinMode(ledPin4, OUTPUT);

 
}
 
void loop() {
 
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);

// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);

// Calculating the distance
distance= duration*0.034/2;

if (distance<3)
{
  digitalWrite(ledPin0, LOW);
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, LOW);
  digitalWrite(ledPin3, LOW);
  digitalWrite(ledPin4, LOW);
 delay(250);
}
if (distance>=3 && distance<4)
{
  digitalWrite(ledPin0, HIGH);
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, LOW);
  digitalWrite(ledPin3, LOW);
  digitalWrite(ledPin4, LOW);
  delay(250);
}

if (distance>=4 && distance<5)
{
  digitalWrite(ledPin0, HIGH);
  digitalWrite(ledPin1, HIGH);
  digitalWrite(ledPin2, LOW);
  digitalWrite(ledPin3, LOW);
  digitalWrite(ledPin4, LOW);
  delay(250);
}

if (distance>=5 && distance<6)
{
  digitalWrite(ledPin0, HIGH);
  digitalWrite(ledPin1, HIGH);
  digitalWrite(ledPin2, HIGH);
  digitalWrite(ledPin3, LOW);
  digitalWrite(ledPin4, LOW);
  delay(250);
}

if (distance>=6 && distance<7)
{
  digitalWrite(ledPin0, HIGH);
  digitalWrite(ledPin1, HIGH);
  digitalWrite(ledPin2, HIGH);
  digitalWrite(ledPin3, HIGH);
  digitalWrite(ledPin4, LOW);
  delay(250);
}
if (distance>=7 && distance<8)
{
  digitalWrite(ledPin0, HIGH);
  digitalWrite(ledPin1, HIGH);
  digitalWrite(ledPin2, HIGH);
  digitalWrite(ledPin3, HIGH);
  digitalWrite(ledPin4, HIGH);
  delay(250);
}

}