#define TRIG_PIN 19
#define ECHO_PIN 34

unsigned long previousTime = 0;
const unsigned long interval = 1000;
float jarak;
int baca = 0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  unsigned long currentTime = millis();
  if (currentTime - previousTime >= interval) {
    jarak = hitungJarak();
    Serial.print("Jarak: ");
    Serial.print(jarak);
    Serial.println(" cm");
    previousTime = currentTime; // Menyimpan waktu terakhir elapsed time diupdate
  }

  if (jarak > 0 && jarak < 20 && baca == 0)
  {
    baca = 1;
    Serial.println("Jarak Anda Terlalu Dekat");
  }

  if (jarak>=20 && baca == 1)
  {
    baca = 0;
  }
}

float hitungJarak() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);

  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  unsigned long duration = pulseIn(ECHO_PIN, HIGH);
  float jarak = duration * 0.034 / 2;

  return jarak;
}