#define ECHO_PIN 3
#define TRIG_PIN 2
#define pinBuzzer 5
#include <Servo.h>
Servo myservo;

int potpin= 0;
int val;

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH); 
  return duration * 0.034 / 2;
}
void setup() {
  pinMode(TRIG_PIN, OUTPUT); 
  pinMode(ECHO_PIN, INPUT); 
  Serial.begin(115200);
  pinMode(pinBuzzer, OUTPUT); 
  myservo.attach(9);
}
void loop() {
  float distance = readDistanceCM(); 
  Serial.print("Measured distance: ");
  Serial.println(readDistanceCM());
  
  if(distance <= 200){ 
  myservo.write(90);
  delay(15);
  tone(pinBuzzer, 1000);
  delay(200);
  tone(pinBuzzer, 500);
  delay(200);
}
  else{
  myservo.write(0);
  noTone(pinBuzzer);
  }
}