#include <Servo.h>

#define ECHO_PIN 3
#define TRIG_PIN 2
#define pinBuzzer 5

Servo myservo;

int potpin = 0;
int pos;
int buzzerPin =  5;

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() {
    
  if (readDistanceCM() < 100){
    for (pos = 0; pos <= 90; pos += 1){
        myservo.write(pos);
        delay(15);
        //tone(buzzerPin, 150);
        //delay(15);
    }
    noTone(buzzerPin);
    delay(1000);

  }else if (readDistanceCM() > 100){

    for (pos = 90; pos >= 0; pos -= 1){
      myservo.write(pos);
      delay(15);
      noTone(buzzerPin); 
    
    }
  }
    
}