// Nama : EKI ZHEN MUTTAQIN
// NIM : 2102020127
// Kelas : A4

// ALARM PENDETEKSI KETINGGIAN AIR
// project IoT menggunakan ESP32 dan sensor HC-SR04 Ultrasonic

//define variabel
#define trigerPin 12
#define echoPin 13
#define ledPin 14
#define speakerPin 15
#define pitch 262
#define CM_TO_INCH 0.393701

long duration;
int distance;
float distanceInch;

// Define latitude, longitude, elevation, status
float latitude = -6.200000;
float longitude = 106.816666;
float elevation = 10.0;
String status = "AMAN";

//menghubungkan ke wifi
#include <WiFi.h>

const char* ssid = "Wokwi-GUEST";
const char* pass = "";

WiFiClient alfa;

//memakai library thingspeak
#include <ThingSpeak.h>

unsigned long ChannelID = 2589088;
const char * WriteAPI = "LKYLR1PXMNGVKIG5";

void setup() {
  //setup untuk sensor
  Serial.begin(115200);
  pinMode(trigerPin, OUTPUT);
  pinMode(echoPin, INPUT);

  //setup untuk led
  pinMode(ledPin, OUTPUT);

  //setup untuk speaker
  pinMode(speakerPin, OUTPUT);

  //scan WiFi
  Serial.println("Scan WiFi...");
  int networks = WiFi.scanNetworks();
  if (networks == 0) {
    Serial.println("No WiFi Networks!");
  } else {
    Serial.print(networks);
    Serial.println("Networks Found!");
    for (int i = 0; i < networks; i++)
      Serial.println(WiFi.SSID(i));
    delay(10);
  }

  //menyambungkan ke wifi
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println("WiFi Connected!");
  Serial.println(WiFi.localIP());

  //memulai program thingspeak
  ThingSpeak.begin(alfa);
}

void loop() {
  //looping sensor (membuat sensor wave)
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigerPin, LOW);

  //membuat durasi
  duration = pulseIn(echoPin, HIGH);

  //mengkalkulasi jarak
  distance = round((duration / 2) * 0.0343);

  // Convert to inches (jika masih diperlukan, tetap gunakan float)
  distanceInch = distance * CM_TO_INCH;

  // Consider max water level height = 50 cm
  if (distance > 50 ) {
    digitalWrite(ledPin, HIGH);
    tone(speakerPin, pitch);
    delay(1000);
    noTone(speakerPin);
    digitalWrite(ledPin, LOW);
    delay(100);
    status = "WARNING!";
  } else {
    digitalWrite(ledPin, LOW);
    noTone(speakerPin);
    status = "AMAN";
  }

  // Update ThingSpeak fields
  ThingSpeak.setField(1, distance);
  ThingSpeak.setField(2, latitude);
  ThingSpeak.setField(3, longitude);
  ThingSpeak.setField(4, elevation);
  ThingSpeak.setField(5, status);

  // Write data to ThingSpeak
  int x = ThingSpeak.writeFields(ChannelID, WriteAPI);

  //menampilkan data
  Serial.print("Ketinggian Air (cm): ");
  Serial.println(50 - distance);
  Serial.print("Status: ");
  Serial.println(status);

  delay(2000);
}