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

#include <Servo.h>

Servo myservo;
int rotasi = 90;
int interval= 0;

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 soundbuzzer(){
if (interval < 500){
  tone(pinBuzzer,250);
}else if(interval > 500){
  tone(pinBuzzer,100,800);
 }
}

void setup() {
  pinMode(TRIG_PIN,OUTPUT);
  pinMode(ECHO_PIN,INPUT);
  Serial.begin(115200);
  pinMode(pinBuzzer,OUTPUT);
  myservo.attach(9);
  myservo.write(90);

}

void loop() {
  // put your main code here, to run repeatedly:
tutupPalang();
//soundbuzzer();
interval  +=100;
if(interval>1000)interval=0;
}

void tutupPalang(){
float jarak=readDistanceCM();
Serial.println(jarak);
 if (jarak > 0 && jarak <100){
  soundbuzzer();
  tutup();}
 else{
  buka();
  noTone(pinBuzzer);
}
}
void tutup(){
  if(rotasi<= 90){
  myservo.write(rotasi);
  delay(100);
  rotasi--;
}
if(rotasi <=0)rotasi =0;
}

void buka(){
if(rotasi>=0){
myservo.write(rotasi);
delay(100);
rotasi+=4;
}
if(rotasi >= 90) rotasi =90;
}