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

// Define pins
#define DHTPIN 2     // DHT sensor pin
#define RELAY_PIN1 10 // Relay pin for heater/fan
#define BUTTON_PIN0 3 // Push button pin
#define BUTTON_PIN1 4  // Push button1 pin
#define BUTTON_PIN2 5  // Push button2 pin
#define LED_PIN 13   // LED pin for indication
#define DHTTYPE DHT22 // DHT 22 (AM2302)

int var = 0;
float currentTemp = 0.0;
float desiredTemp = 35.0; // Default desired temperature
float currentHumidity = 0.0;
float desiredHumidity = 60.0;
bool relayState = false;
bool led
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 20, 4);

volatile bool buttonPressed = false; // Variable to indicate button press
unsigned long previousMillis = 0; // Store the last time the button was pressed
const long interval = 3000; // Interval for 5 seconds

void setup() {
  lcd.init();
  lcd.backlight();
 // lcd.clear();
  dht.begin();
  Serial.begin(9600);
  pinMode(RELAY_PIN1, OUTPUT);
  pinMode(BUTTON_PIN0, INPUT_PULLUP);  
  pinMode(BUTTON_PIN1, INPUT_PULLUP);  // Use internal pull-up resistor
  pinMode(BUTTON_PIN2, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT); // LED pin as output

  // Attach interrupt to BUTTON_PIN0
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN0), buttonISR, FALLING);
}

void loop() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis; }
    Serial.println( previousMillis);
  // Check if the button was pressed
  if (buttonPressed) {
      SetValue();      }            // Call function to toggle LED



    if(ledState == HIGH) {
      lcd.clear();
         switch (var) {
        case 1:
       
        /*lcd.setCursor("SET TEMP", 1);
        lcd.print("T: ");
        lcd.print(desiredTemp);
        lcd.setCursor(15, 1);
        lcd.print("'C");
        lcd.setCursor(2, 2);
        lcd.print("H: ");
        lcd.print(desiredHumidity);
        lcd.setCursor(15, 2);
        lcd.print(" %"); */
        previousMillis = currentMillis;    }

        lcd.clear();
        var = 0;
        previousMillis = 0;
        break;

        default:
         while(currentMillis - previousMillis <= interval) {
        lcd.setCursor(3, 0);
        lcd.print("SET VALUE");
        previousMillis = currentMillis;  }
        lcd.clear();
        break;
  } 

/*
    var =+ 1;
    digitalWrite(LED_PIN, HIGH); 
    lcd.clear();
        switch (var) {

        case 1:
        while(millis() - previousMillis <= interval) {
        lcd.setCursor(3, 0);
        lcd.print("SET VALUE");
        lcd.setCursor("SET TEMP", 1);
        lcd.print("T: ");
        lcd.print(desiredTemp);
        lcd.setCursor(15, 1);
        lcd.print("'C");
        lcd.setCursor(2, 2);
        lcd.print("H: ");
        lcd.print(desiredHumidity);
        lcd.setCursor(15, 2);
        lcd.print(" %");

        if(digitalRead(BUTTON_PIN1) == LOW) { 
          delay(50);
          desiredTemp += 0.1; // Increase desired temperature by 0.1°C
          if (desiredTemp > 50.0) { desiredTemp = 50.0; }  // Limit temp 50C
          //previousMillis = 0;
        }
        if(digitalRead(BUTTON_PIN2 == LOW)) { 
          delay(50);
          desiredTemp -= 0.1; // Increase desired temperature by 0.1°C
          if (desiredTemp> 25.0) { desiredTemp = 25.0; }  // Limit H 90%
          //previousMillis = 0;
        }
    previousMillis = millis();
        }
        digitalWrite(LED_PIN, LOW);
        Serial.print(previousMillis);
        lcd.clear();
        break;
  }
   Your regular code goes here (e.g., reading DHT sensor, controlling relay, etc.)
  */// Read current temperature and humidity
  float currentTemp = dht.readTemperature();
  float currentHumidity = dht.readHumidity();
  
  // Display the temperature and humidity on the LCD
  //lcd.clear();
  lcd.setCursor(4, 0);
  lcd.print("PV");
  lcd.setCursor(12, 0);
  lcd.print("SV");

  lcd.setCursor(0, 1);
  lcd.print("T: ");
  lcd.print(currentTemp);
  lcd.setCursor(17, 1);
  lcd.print("'C");

  lcd.setCursor(0, 2);
  lcd.print("H: ");
  lcd.print(currentHumidity);
  lcd.setCursor(17, 2);
  lcd.print(" %");

  lcd.setCursor(11, 1);
  lcd.print(desiredTemp);

  lcd.setCursor(11, 2);
  lcd.print(desiredHumidity); 
  
   // delay(200); // Update every second
}



// Interrupt Service Routine (ISR) for the button press
void buttonISR() {
  buttonPressed = true; // Set the flag when button is pressed
}

// Function to toggle LED state
void SetValue() {
  lcd.clear();
  lcd.setCursor(5, 0);
  lcd.print("SET VALUE");
  if (var <3 )  {
  var =+ 1;       }
  else
  var = 0;
  
  //static bool ledState = LOW; // Static variable to remember the LED state
  //ledState = !ledState; // Toggle the state
  //digitalWrite(LED_PIN, ledState); // Set the LED pin
  digitalWrite(LED_PIN, HIGH);

  
 
//  delay(3000);
//  lcd.clear();
  buttonPressed = false;  // Reset the flag
  digitalWrite(LED_PIN, LOW);
}