#include <Arduino.h>
#include <WiFi.h>
#include <FirebaseESP32.h>
#include <DHT.h>

//Provide the token generation process info.
#include "addons/TokenHelper.h"
//Provide the RTDB payload printing info and other helper functions.
#include "addons/RTDBHelper.h"

#define DHTPIN 15
#define DHTTYPE DHT22

// Replace with your network credentials
const char* WIFI_SSID = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";

// Replace with your Firebase project details
#define FIREBASE_HOST "ddddd-1cdbe-default-rtdb.firebaseio.com/"
#define FIREBASE_API_KEY "AIzaSyB_FdbevS4c3gcVhGMdnWIyP7viqBVD5zU"

DHT dht(DHTPIN, DHTTYPE);

FirebaseData firebaseData;

FirebaseConfig firebaseConfig;
FirebaseAuth firebaseAuth;

unsigned long sendDataPrevMillis = 0;
int count = 0;
bool signupOK = false;

void setup(){
  Serial.begin(115200);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED){
    Serial.print(".");
    delay(300);
  }
  Serial.println();
  Serial.print("Connected with IP: ");
  Serial.println(WiFi.localIP());
  Serial.println();

  // Set Firebase configuration and authentication details
  firebaseConfig.database_url = FIREBASE_HOST;
  firebaseConfig.api_key = FIREBASE_API_KEY;

  /* Sign up */
  if (Firebase.signUp(&firebaseConfig, &firebaseAuth, "", "")){
    Serial.println("ok");
    signupOK = true;
  }
  else{
    Serial.printf("%s\n", firebaseConfig.signer.signupError.message.c_str());
  }

  /* Assign the callback function for the long running token generation task */
  firebaseConfig.token_status_callback = tokenStatusCallback; //see addons/TokenHelper.h
  
  // Connect to Firebase
  Firebase.begin(&firebaseConfig, &firebaseAuth);
  Firebase.reconnectWiFi(true);

  // Initialize DHT sensor
  dht.begin();
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Send data to Firebase
  if (Firebase.setFloat(firebaseData, "/temperature", temperature)) {
    Serial.println("Temperature data sent successfully!");
  } else {
    Serial.println("Failed to send temperature data");
    Serial.println(firebaseData.errorReason());
  }

  if (Firebase.setFloat(firebaseData, "/humidity", humidity)) {
    Serial.println("Humidity data sent successfully!");
  } else {
    Serial.println("Failed to send humidity data");
    Serial.println(firebaseData.errorReason());
  }

  delay(2000);  // Delay for 2 seconds before the next loop
}


*** XML ***
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    android:padding="20dp"
    tools:context=".MainActivity">

    <Switch
        android:id="@+id/switchStatus"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Switch ON/OFF"
        android:textSize="18sp"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="submit"
        android:id="@+id/btnid"
        />

    <TextView
        android:id="@+id/textViewData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Waiting for data..."
        android:textSize="22sp"
        android:textStyle="bold"
        android:layout_marginTop="20dp"/>
    <TextView
        android:id="@+id/humidity"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Waiting for data..."
        android:textSize="22sp"
        android:textStyle="bold"
        android:layout_marginTop="20dp"/>

</LinearLayout>


**** JAVA CODE****
package com.example.day_7;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.Switch;
import android.widget.TextView;

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

public class MainActivity extends AppCompatActivity {

    private Switch switchStatus;
    private TextView textViewData;
    private TextView humidity;
    private DatabaseReference databaseRef;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        switchStatus = findViewById(R.id.switchStatus);
        textViewData = findViewById(R.id.textViewData);
        humidity = findViewById(R.id.humidity);


        // Firebase Database Reference
        databaseRef = FirebaseDatabase.getInstance().getReference();

        // Switch Change Listener
        switchStatus.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                String status = isChecked ? "ON" : "OFF";
                databaseRef.child("SwitchStatus").setValue(status);
            }
        });


        // Read Int Value from Firebase in Real-time
        databaseRef.child("temperature").addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                if (snapshot.exists()) {
                    int temperature = snapshot.getValue(Integer.class);
                    textViewData.setText("Sensor Value: " + temperature);
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError error) {
                textViewData.setText("Error Loading Data");
            }
        });
        // Read Int Value from Firebase in Real-time
        databaseRef.child("humidity").addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                if (snapshot.exists()) {
                    int humiditys = snapshot.getValue(Integer.class);

                    humidity.setText("Sensor Value: " + humiditys);
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError error) {
                textViewData.setText("Error Loading Data");
            }
        });
    }
}