Servo rotate when ultrasonic detect

#include <Servo.h>

const int trigPin = 9;

const int echoPin = 10;

const int servoPin = 11;

const int distanceThreshold = 10; // Distance threshold in cm

long duration;

int distance;

Servo myServo;  // Create a servo object to control the servo

void setup() {

  pinMode(trigPin, OUTPUT);

  pinMode(echoPin, INPUT);

  myServo.attach(servoPin);  // Attach the servo on pin 11 to the servo object

  Serial.begin(9600);  // Start the serial communication

  myServo.write(0);  // Set initial position of the servo to 0 degrees

}

void loop() {

  // Clear the trigPin

  digitalWrite(trigPin, LOW);

  delayMicroseconds(2);

  // Set the trigPin on HIGH state for 10 microseconds

  digitalWrite(trigPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

  // Read the echoPin, return the sound wave travel time in microseconds

  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance

  distance = duration * 0.034 / 2;

  // Print the distance on the Serial Monitor

  Serial.print("Distance: ");

  Serial.print(distance);

  Serial.println(" cm");

  // Check if the distance is less than the threshold

  if (distance <= distanceThreshold) {

    myServo.write(170);  // Rotate servo to 90 degrees

  } else {

    myServo.write(0);   // Rotate servo back to 0 degrees

  }

  delay(500);  // Wait for half a second before the next loop

}