#include <LiquidCrystal_I2C.h>
#define ECHO_PIN 2
#define TRIG_PIN 3
#define buzzer 4
#define ledhijau 13
#define ledkuning 12
#define ledmerah 11

LiquidCrystal_I2C lcd(0x27,20,4);

// Variabel untuk ukuran tangki (dalam cm)
const float tinggiTangki = 400; // Tinggi tangki dalam cm
const float diameterTangki = 379.1; // Diameter tangki dalam cm
const float luasAlasTangki = 3.14 * (diameterTangki / 2.0) * (diameterTangki / 2.0); // Luas alas dalam cm^2

void setup() {
  pinMode(ledhijau, OUTPUT);
  pinMode(ledkuning, OUTPUT);
  pinMode(ledmerah, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(buzzer, OUTPUT);
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  digitalWrite(ledhijau, HIGH);
  digitalWrite(ledkuning, HIGH);
  digitalWrite(ledmerah, HIGH);
  tone(4,300,500);
  lcd.setCursor(0,1);
  lcd.print("  SOLAR TANK");
  lcd.setCursor(8,2);
  lcd.print("MONITORING");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0,1);
  lcd.print("ALHIKMAL MARDIANSAH");
  lcd.setCursor(0,2);
  lcd.print("  POLITEKNIK JAMBI");
  delay(3000);
  digitalWrite(ledhijau, LOW);
  digitalWrite(ledkuning, LOW);
  digitalWrite(ledmerah, LOW);
  digitalWrite(buzzer, LOW);
  lcd.clear();
 }

 float kedalaman() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int durasi = pulseIn(ECHO_PIN, HIGH);
  return tinggiTangki - durasi * 0.034 / 2;
 }

 float hitungVolume(float kedalaman) {
  return (kedalaman * luasAlasTangki) / 1000.0; // Volume dalam liter
 }

void loop() {
  float kdlm = kedalaman();
  float volume = hitungVolume(kdlm);
  
  if (kdlm > 350) {
    digitalWrite(ledhijau, HIGH);
    digitalWrite(ledkuning, LOW);
    digitalWrite(ledmerah, LOW);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("SOLAR TANK MONITORING");
    lcd.setCursor(0,1);
    lcd.print("LEVEL :");
    lcd.setCursor(8,1);
    lcd.print(kdlm);
    lcd.setCursor(18,1);
    lcd.print("CM");
    lcd.setCursor(0,2);
    lcd.print("VOLUME:");
    lcd.setCursor(8,2);
    lcd.print(volume);
    lcd.setCursor(18,2);
    lcd.print("L");
    lcd.setCursor(0,3);
    lcd.print("STATUS:");
    lcd.setCursor(8,3);
    lcd.print("FULL");
    tone(4,800,1000);
    delay(1000);
    lcd.clear();
    delay(100);
  }
   
  else if (kdlm >= 25 && kdlm < 350) {
    digitalWrite(ledhijau, LOW);
    digitalWrite(ledkuning, HIGH);
    digitalWrite(ledmerah, LOW);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("SOLAR TANK MONITORING");
    lcd.setCursor(0,1);
    lcd.print("LEVEL :");
    lcd.setCursor(8,1);
    lcd.print(kdlm);
    lcd.setCursor(18,1);
    lcd.print("CM");
    lcd.setCursor(0,2);
    lcd.print("VOLUME:");
    lcd.setCursor(8,2);
    lcd.print(volume);
    lcd.setCursor(18,2);
    lcd.print("L");
    lcd.setCursor(0,3);
    lcd.print("STATUS:");
    lcd.setCursor(8,3);
    lcd.print("BERISI");
    delay(1000);
    lcd.clear();
    delay(100);
  } 
  
  else {
    digitalWrite(ledhijau, LOW);
    digitalWrite(ledkuning, LOW);
    digitalWrite(ledmerah, HIGH);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("SOLAR TANK MONITORING");
    lcd.setCursor(0,1);
    lcd.print("LEVEL :");
    lcd.setCursor(8,1);
    lcd.print(kdlm);
    lcd.setCursor(18,1);
    lcd.print("CM");
    lcd.setCursor(0,2);
    lcd.print("VOLUME:");
    lcd.setCursor(8,2);
    lcd.print(volume);
    lcd.setCursor(18,2);
    lcd.print("L");
    lcd.setCursor(0,3);
    lcd.print("STATUS:");
    lcd.setCursor(8,3);
    lcd.print("HAMPIRKOSONG");
    delay(1000);
    lcd.clear();
    delay(100);
  }
}