#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "TMPL6n6O-djdI"
#define BLYNK_TEMPLATE_NAME "TEST 1"
#define BLYNK_AUTH_TOKEN "FuqEeWsIa_cXsQaE-uSz4dTma0PifAP0"

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define OLED_RESET    -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define TRIG_PIN 13
#define ECHO_PIN 12
#define BUZZER_PIN 19

const int thresholdHeight = 30;  // Ambang batas level air rendah (dalam cm)

char ssid [] = "Wokwi-GUEST";
char pass [] ="";
BlynkTimer timer;

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  // Inisialisasi OLED
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // 0x3C adalah alamat I2C OLED
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Berhenti jika gagal
  }
  
  display.display(); // Menampilkan buffer awal
  delay(2000);       // Tunggu beberapa detik
  display.clearDisplay(); // Bersihkan layar
  display.setTextSize(1); // Ukuran teks normal
  display.setTextColor(SSD1306_WHITE); // Warna teks putih
  
  // Menampilkan judul
  display.setCursor(0, 0);
  display.println("TANGKI AIR");
  display.println("JAROT WIWOHO");
  delay(2000);
  display.display();  // Menampilkan teks di OLED

  Blynk.begin (BLYNK_AUTH_TOKEN, ssid, pass);
  timer.setInterval (1000L, sendData);

}

void loop(){

  Blynk.run();
  timer.run();

}


void sendData() {

  String textStatus;

  long duration, distance;
  
  // Mengirim pulsa ultrasonik
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  
  // Menghitung durasi echo
  duration = pulseIn(ECHO_PIN, HIGH);
  
  // Menghitung jarak (dalam cm)
  distance = duration * 0.034 / 2;

  // Menampilkan hasil pada OLED
  display.clearDisplay();
  display.setCursor(0, 0);
  display.println("TANGKI AIR");
  display.setCursor(0, 20);
  display.print("Ketinggian: ");
  display.print(distance);
  display.print(" cm");
  display.display();  // Update layar OLED

  // Cek level air
  if (distance < thresholdHeight) {
    digitalWrite(BUZZER_PIN, HIGH);  // Nyalakan buzzer
  } else {
    digitalWrite(BUZZER_PIN, LOW);   // Matikan buzzer
  }

  delay(1000);  // Delay sebelum pengukuran berikutnya

  //Kirim Data Ke Blynk
  textStatus = "Tangki Air";
  Blynk.virtualWrite(V0, textStatus);

  //Data Distance
  Blynk.virtualWrite(V1, distance);


}