void setup() {
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(9, OUTPUT);

pinMode(3, OUTPUT);
pinMode(2, INPUT);

Serial.begin(115200);

}

void loop() {
digitalWrite(3, HIGH);
delayMicroseconds(9);
digitalWrite(3, LOW);

int A = pulseIn(2,HIGH);

int D = A / 58;

Serial.print(D);
delay(300);
if (D > 60){
  digitalWrite(12, HIGH);
}
else{
  digitalWrite(12,LOW);
}
 if (D < 60 & D > 20){
   digitalWrite(11, HIGH);
 }
 else{
  digitalWrite(11, LOW);
}
   if (D < 20){
    digitalWrite(9, HIGH);
   }
   else{
    digitalWrite(9, LOW);
   }






}