int trig = 2;
int echo = 3;
int led = 8;
int duration;
float distance;
int led3 = 6;
int led4 = 5;
int led2 = 7;
void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);

  Serial.begin(9600);

}

void loop() {
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(trig,LOW);

  duration = pulseIn(echo, HIGH);

  distance = duration * 0.034 / 2;

  Serial.println(distance);

  delay(200);

if(distance >10){
  digitalWrite(led, HIGH);
}
else{
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW);
}

if(distance > 50){
  digitalWrite(led2, HIGH);
}
else{
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(led, LOW);

}
if(distance > 200){
  digitalWrite(led3, HIGH);
}
else{
  digitalWrite(led4, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led, LOW);
}


if(distance  > 350){
  digitalWrite(led4, HIGH);
}
else{
  digitalWrite(led4, LOW);
}

}