int trig = 14;
int echo = 27;
int led2 = 26;
float reading;
float distance;
int led = 12;
int led3 =16;


void setup() {
  Serial.begin(115200);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(led,OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}

void loop() {
  digitalWrite(trig, HIGH);
  delay(10);
  digitalWrite(trig, LOW);
  reading =(pulseIn(echo,HIGH));
  distance = (reading*0.034/2)+1;
  Serial.println(distance);
  delay(1000); 
  if (distance>300)
  {
    Serial.println("safe paa");
    digitalWrite(led, HIGH);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
  }
 else if (distance>200)
  {
    Serial.println("alert arumugam");
    digitalWrite(led2, HIGH);
    digitalWrite(led, LOW);
    digitalWrite(led3, LOW);
  }
  else if (distance>100)
  {
    Serial.println("danger");
    digitalWrite(led3, HIGH);
    digitalWrite(led, LOW);
    digitalWrite(led2, LOW);

  }
  else
{
  digitalWrite(led, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  
}
}