int trig = 12;
int echo = 13;
int distance;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(18, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(5, OUTPUT);

}

void loop() {
  digitalWrite(trig, HIGH);
  delay(100);
  digitalWrite(trig, LOW);
  int reading = (pulseIn(echo,HIGH));
  distance=(reading*0.034/2);
  if(distance<100)
  {
    digitalWrite(19, HIGH);
    digitalWrite(18, LOW);
    digitalWrite(5, LOW);
    Serial.println("Danger");
  }
  else if (distance<200)
  {
    digitalWrite(19, LOW);
    digitalWrite(18, HIGH);
    digitalWrite(5, LOW);
    Serial.println("Alart");
  }
  else if (distance<300)
  { 
    digitalWrite(19, LOW);
    digitalWrite(18, LOW);
    digitalWrite(5, HIGH);
    Serial.println("safe");
  }
  Serial.println(distance);





  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}