#include <DFRobot_DHT11.h>
#include <LiquidCrystal.h>

#define DHT11_PIN A0
#define DTTYPE DHT11 

LiquidCrystal lcd(8, 9, 5, 4, 3, 2); // LCD output pins


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

float voltage = 0; // Declaring variables to store values
int powerState = 0;
int batteryState = 0;
int chargeState = 0;
int voltage110 = 0;
int voltageState1 = 0;
int voltageState2 = 0;
int LED = 1; // Declaring LEDs
int LED2 = 0;

void setup() {
  pinMode(LED, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(chrgeFail, INPUT);
  pinMode(power, INPUT);
  pinMode(voltageRead, INPUT);
  pinMode(highVolt, INPUT);
  pinMode(lowVolt, INPUT);

  Serial.begin(9600); //set up lcd
  lcd.begin(20, 4);
  lcd.setCursor(0, 0);
  lcd.print("UPS REG");
delay(500);
lcd.clear();

  }

void loop() {
  Serial.println();

  int DHT11_temperature = analogRead(DHT11_PIN); // Reading the DHT11 value
 
  Serial.println(DHT11_temperature);

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

  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, 6);
  lcd.print(DHT11_temperature);

  lcd.setCursor(0, 1);
  lcd.print("temp=");
  lcd.print(voltage110);
  lcd.print((char)223);


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

  if (chargeState == HIGH) { // Trigger if the charge is failing
    digitalWrite(LED, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("CHARGER FAIL ALARM");
  }
    else
    {digitalWrite(LED, LOW);
     lcd.setCursor(0, 2);
    lcd.print("");

  }

  if (voltageState2 == HIGH) { // Trigger if the battery voltage is low
    digitalWrite(LED, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("LOW DC VOLTAGE");
  }
    else
    {digitalWrite(LED, LOW);
     lcd.setCursor(0, 2);
    lcd.print("");
  }

  if (voltageState1 == HIGH) { // Trigger if the battery is overcharged
    digitalWrite(LED, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("HIGH DC VOLTAGE");
  }
  else
  {digitalWrite(LED, LOW);
     lcd.setCursor(0, 2);
    lcd.print("");
  }

  if (powerState == HIGH) { // Trigger if the power is failing
    digitalWrite(LED, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("POWER FAILURE ALARM");
  }
    else 
    {
    digitalWrite(LED, LOW);
    lcd.setCursor(0, 2);
    lcd.print("");
  }

  if (DHT11_temperature >= 30) { // Activate the LED representing the fan when the temperature is above 30 degrees
    digitalWrite(LED2, HIGH);
  }

  delay(1000);
}