#include <Servo.h>
#define trigPin 11
#define echoPin 10
#define redLED 8
int girvoPin = 3;
Servo Girvo1;


void setup() {
  Serial.begin(9600);
  pinMode(trigPin,OUTPUT); 
  pinMode(echoPin, INPUT);
  pinMode(redLED, OUTPUT);
  Girvo1.attach(girvoPin);
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(10);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn (echoPin, HIGH);
  distance = (duration/2)/ 29.1;
  if(distance < 4) {
  digitalWrite(redLED, HIGH);
  Girvo1.write(0);
  delay(10);
  } else {
    digitalWrite(redLED, LOW);
    Girvo1.write(90);
    delay(10);
}

if (distance >= 200 || distance <= 0){
  Serial.println("Out of range");
 } else {
  Serial.println(distance);
  Serial.println(" cm");

}
delay(1000);


}