#include <Servo.h>

const int trigPin = 2;    // Ultrasonic sensor trigger pin
const int echoPin = 3;    // Ultrasonic sensor echo pin
const int servoPin = 4;   // Servo motor signal pin

Servo gateServo;   // Create a servo object

long duration;
int distance;

void setup() {
  gateServo.attach(servoPin); // Attach servo to its pin
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // Ultrasonic sensor operation
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2); 
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  // Control the gate based on distance
  if (distance < 10) { // Adjust the distance value as needed 
    openGate(); // If an object is close, open the gate 
  } else { 
    closeGate(); // Otherwise, close the gate
  }

  delay(500); // Adjust the delay as needed for your setup
}

void openGate() {
   gateServo.write(90); // Open position (90 degrees)
   delay(1000); // Adjust the delay as needed to allow time for the gate 
}

void closeGate() {
   gateServo.write(0); // close position (0 degrees)
   delay(1000); // Adjust the delay as needed to allow time for the gate
}