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

#define DHTPIN A1         // Pin where the DHT22 is connected
#define DHTTYPE DHT22     // DHT 22 (AM2302)
 

// Setup display and temperature sensor
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Update the address if needed

// Create DHT object
DHT dht(DHTPIN, DHTTYPE);

// Declaring ALARMS TRIGGER pins
const int chrgeFail = 10;
const int lowVolt = 11;
const int highVolt = 12;
const int voltageRead = A5;
const int power = 13;

float voltage = 0; // Declaring variables to store values
int powerState = 0;
int chargeState = 0;
int voltage110 = 0;
int voltageState1 = 0;
int voltageState2 = 0;
int LED = 7; // Declaring LEDs
int LED2 = 8;

void setup() {
  // put your setup code here, to run once:
 pinMode(LED, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(chrgeFail, INPUT);
  pinMode(power, INPUT);
  pinMode(voltageRead, INPUT);
  pinMode(highVolt, INPUT);
  pinMode(lowVolt, INPUT);

  Serial.begin(9600);
  lcd.begin(20, 4);
  dht.begin(); // Initialize DHT sensor

  lcd.setCursor(0, 0);
  lcd.print("UPS REG");
  delay(500);
  lcd.clear();
}


void loop() {
  // put your main code here, to run repeatedly:
// Read DHT22 temperature and humidity
  float DHT22_temperature = dht.readTemperature(); // Read temperature in Celsius

  // Check if any reads failed and exit early (to try again)
  if (isnan(DHT22_temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Read voltage and calculate
  voltage = analogRead(voltageRead);
  voltage110 = (voltage / 1023.0) * 110; // Corrected calculation with floating-point division

  // Read digital states
  powerState = digitalRead(power);
  chargeState = digitalRead(chrgeFail);
  voltageState1 = digitalRead(highVolt);
  voltageState2 = digitalRead(lowVolt);

  lcd.setCursor(0, 0); // Display the actual temperature of the battery
  lcd.print("UPS ROOM");

  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(DHT22_temperature);
  lcd.print("C");

  lcd.setCursor(0, 2);
  lcd.print("NO ALARM     ");
  digitalWrite(LED, LOW);

  // Alarm logic
  bool alarmActive = false;
  if (chargeState == HIGH) {
    digitalWrite(LED, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("CHARGER FAIL ALARM");
    alarmActive = true;
  } else if (voltageState2 == HIGH) {
    digitalWrite(LED, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("LOW DC VOLTAGE    ");
    alarmActive = true;
  } else if (voltageState1 == HIGH) {
    digitalWrite(LED, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("HIGH DC VOLTAGE   ");
    alarmActive = true;
  } else if (powerState == HIGH) {
    digitalWrite(LED, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("POWER FAILURE ALARM");
    alarmActive = true;
  }

  if (DHT22_temperature > 30) { // Activate the LED representing the fan when the temperature is above 30 degrees
    digitalWrite(LED2, HIGH);
  lcd.setCursor(0, 3);
  lcd.print("OVERHEATING!!");
  } else {
    digitalWrite(LED2, LOW);
    lcd.setCursor(0, 3);
  lcd.print("");
  }

if (DHT22_temperature < 30) { // Activate the LED representing the fan when the temperature is above 30 degrees
    digitalWrite(LED2, LOW);
  lcd.setCursor(0, 3);
  lcd.print("");
  } else {

    lcd.setCursor(0, 3);
  lcd.print("");
  }
  delay(1000);
}