int  trigger = 12;
int echo = 13;
float distance;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(19, OUTPUT);
  pinMode(15, OUTPUT);
  pinMode(22, OUTPUT);

}

int uf(){
  digitalWrite(trigger, LOW);
  delay(10);
  digitalWrite(trigger, HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
  distance=pulseIn(echo, HIGH);
  return (distance*0.034/2)+1;

}

void loop() {
Serial.println(uf());

if(uf()>0 && uf()<100){
digitalWrite(19, HIGH);
digitalWrite(15, LOW);
  digitalWrite(22, LOW);
}

else if(uf()>100 && uf()<200)
{
  digitalWrite(15, HIGH);
    digitalWrite(19, LOW);
      digitalWrite(22, LOW);
  

}

else if(uf()>200 && uf()<400)
{
  digitalWrite(22, HIGH);
    digitalWrite(19, LOW);
    digitalWrite(15, LOW);

}

else {
  digitalWrite(19, LOW);
    digitalWrite(15, LOW);
  digitalWrite(22, LOW);

}
}