int trigPin =9;
int echoPin = 10;
int ldrPin = A0;
int led1 = 11;
int led2 = 6;
int led3 = 5;
int led4 = 3;
int led5 = 13;
long duration;
int distance;
int safedistance;
int light;

void setup(){
  pinMode(trigPin,OUTPUT);
  pinMode(echoPin,INPUT);
  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  pinMode(led3,OUTPUT);
  pinMode(led4,OUTPUT);
  pinMode(led5,OUTPUT);
  pinMode(ldrPin,INPUT);
  Serial.begin(9600);
}
  void loop(){
    digitalWrite(trigPin,LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin,HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin,LOW);
    duration = pulseIn(echoPin,HIGH);
    distance = duration*0.034/2;
    safedistance = distance;
    int light = analogRead(ldrPin);

    if (light<=400)
    {
      if (safedistance<=5)
      {digitalWrite(led1,HIGH);
      delay(50);
      digitalWrite(led2,HIGH);
      delay(70);
      digitalWrite(led3,HIGH);
      delay(90);
      digitalWrite(led4,HIGH);
      delay(110);
      digitalWrite(led5,HIGH);
      delay(130);}
      
      else if(safedistance>5)
      {digitalWrite(led1,LOW);
      delay(10);
      digitalWrite(led2,LOW);
      delay(20);
      digitalWrite(led3,LOW);
      delay(30);
      digitalWrite(led4,LOW);
      delay(40);
      digitalWrite(led5,LOW);
      delay(50);}
      }
      
      delay(200);
    }