#define echo 23
#define trig 22
#define buzzer 13
#define DO 262
#define re 294 
#define mi 330 
#define fa 349  
#define so 392 
#define la 440  
#define si 494  
#define do2 523  


void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(echo, INPUT);
  pinMode(trig, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  int waktu = pulseIn(echo, HIGH);
  float jarak = waktu*0.035/2;

  Serial.print("jarak=");
  Serial.print(jarak);
  Serial.println("cm");


  if(jarak <200 )
  {
    for(int i=0;i<10;i++)
    {
  tone(buzzer,DO,100);
  tone(buzzer,re,100);
  tone(buzzer, mi, 100);
  tone(buzzer, fa, 100);
  tone(buzzer, so, 100);
  tone(buzzer, la, 100);
  tone(buzzer, si, 100);
  tone(buzzer, do2,100);
    }
    delay(100);
  }
  
delay(100);
}