#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

#define DHTPIN 2
#define DHTTYPE DHT22
#define BUZZER 8

// Potensiometer
#define POT_IAC A0
#define POT_VAC A1
#define POT_IDC A2
#define POT_VDC A3
#define POT_COS A6

LiquidCrystal_I2C lcd(0x27, 20, 4);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  lcd.init();
  lcd.backlight();
  dht.begin();
  pinMode(BUZZER, OUTPUT);

  lcd.setCursor(0, 1);
  lcd.print(" Inverter Monitor ");
  delay(2000);
  lcd.clear();
}

void loop() {

  // === BACA POTENSIOMETER ===
  float Iac = map(analogRead(POT_IAC), 0, 1023, 0, 1000) / 100.0;  // 0–10 A
  float Vac = map(analogRead(POT_VAC), 0, 1023, 0, 2500) / 10.0;   // 0–250 V
  float Idc = map(analogRead(POT_IDC), 0, 1023, 0, 500) / 10.0;   // 0–50 A
  float Vdc = map(analogRead(POT_VDC), 0, 1023, 0, 6000) / 10.0;  // 0–600 V
  float cosphi = map(analogRead(POT_COS), 0, 1023, 0, 100) / 100.0;

  // === HITUNG DAYA ===
  float Pac = Vac * Iac * cosphi;
  float Pdc = Vdc * Idc;

  // === SUHU ===
  float suhu = dht.readTemperature();

  // === TAMPIL LCD ===
  lcd.setCursor(0, 0);
  lcd.print("AC:");
  lcd.print(Vac,1); lcd.print("V ");
  lcd.print(Iac,1); lcd.print("A");

  lcd.setCursor(0, 1);
  lcd.print("P_AC:");
  lcd.print(Pac,0); lcd.print("W ");
  lcd.print("PF:");
  lcd.print(cosphi,2);

  lcd.setCursor(0, 2);
  lcd.print("DC:");
  lcd.print(Vdc,1); lcd.print("V ");
  lcd.print(Idc,1); lcd.print("A");

  lcd.setCursor(0, 3);
  lcd.print("P_DC:");
  lcd.print(Pdc,0); lcd.print("W ");
  lcd.print("T:");
  lcd.print(suhu,1); lcd.print("C");

  // === ALARM ===
  if (Vac > 240 || Iac > 10 || suhu > 50) {
    digitalWrite(BUZZER, HIGH);
  } else {
    digitalWrite(BUZZER, LOW);
  }

  delay(800);
}