#define BLYNK_TEMPLATE_ID "TMPL3IBLGDdC1"
#define BLYNK_TEMPLATE_NAME "Wifi Home Automation"
#define BLYNK_AUTH_TOKEN "n835Zo6II3nmh10KSWqg2fhyTnn8KT8J"

#define BLYNK_PRINT Serial

#include <WiFi.h>                 // add Wi-fi Library
#include <WiFiClient.h>           // add Wi-fi Client Library
#include<BlynkSimpleEsp32.h>     // add Blynk Esp32 Library

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";      // set Wifi name 
char pass[] = "";                 // set passwaord

BlynkTimer timer;

//*******************************************************************************
// define Physical button pin connection on Arduino pins
#define button1_pin 25
#define button2_pin 33
#define button3_pin 32
#define button4_pin 35

// define Relay pin connection on Arduino pins
#define relay1_pin 12
#define relay2_pin 14
#define relay3_pin 27
#define relay4_pin 26

// set Relay state to 0 initially 
int relay1_state = 0;
int relay2_state = 0;
int relay3_state = 0;
int relay4_state = 0;

// define Virtual Button pin for Blynk App (so Virtual Buttons can be changed according to Room)
#define button1_vpin V1
#define button2_vpin V2
#define button3_vpin V3
#define button4_vpin V0

// Blynk.Cloud request the letest state from the server
BLYNK_CONNECTED()                       
{
  Blynk.syncVirtual(button1_vpin);
  Blynk.syncVirtual(button2_vpin);
  Blynk.syncVirtual(button3_vpin);
  Blynk.syncVirtual(button4_vpin);
}

//when push button switched from Blynk App then Virtual pin state & Relay state changes
BLYNK_WRITE(button1_vpin)
{
  relay1_state = param.asInt();
  digitalWrite(relay1_pin , relay1_state);
}
BLYNK_WRITE(button2_vpin)
{
  relay2_state = param.asInt();
  digitalWrite(relay2_pin , relay2_state);
}
BLYNK_WRITE(button3_vpin)
{
  relay3_state = param.asInt();
  digitalWrite(relay3_pin , relay3_state);
}
BLYNK_WRITE(button4_vpin)
{
  relay4_state = param.asInt();
  digitalWrite(relay4_pin , relay4_state);
}

//************************************************************************

void setup()
{
  Serial.begin(115200);                // set Buad Rate to 1,15,200

  //define buttons as Input
  pinMode(button1_pin,INPUT_PULLUP);
  pinMode(button2_pin,INPUT_PULLUP);
  pinMode(button3_pin,INPUT_PULLUP);
  pinMode(button4_pin,INPUT_PULLUP);

// define Relay as Output
  pinMode(relay1_pin,OUTPUT);
  pinMode(relay2_pin,OUTPUT);
  pinMode(relay3_pin,OUTPUT);
  pinMode(relay4_pin,OUTPUT);

//set Relay pin High initially
  digitalWrite(relay1_pin,HIGH);
  digitalWrite(relay2_pin,HIGH);
  digitalWrite(relay3_pin,HIGH);
  digitalWrite(relay4_pin,HIGH);

  Blynk.begin(auth,ssid,pass);      // fetching Token, Wifi name & Password
}

//***************************************************************************

void loop()
{
  Blynk.run();                    
  timer.run();
  listen_push_buttons();           // get data from push buttons
}

//**************************************************************************
//defining listen_push_function here to get data from buttons

void listen_push_buttons()
{
  if(digitalRead(button1_pin)==LOW)
  {
    delay(200);
    control_relay(1);
    Blynk.virtualWrite(button1_pin , relay1_state);                // update button state
  }

  else if(digitalRead(button2_pin)==LOW) {
    delay(200);
    control_relay(2);
    Blynk.virtualWrite(button2_pin , relay2_state);
  }

  else if(digitalRead(button3_pin)==LOW) {
    delay(200);
    control_relay(3);
    Blynk.virtualWrite(button3_pin , relay3_state);
  }

  else if (digitalRead(button4_pin)==LOW) {
    delay(200);
    control_relay(4);
    Blynk.virtualWrite(button4_pin , relay4_state);
  }
}

//*****************************************************************
//define contro_relay function 

void control_relay(int relay)
{
  if(relay==1)
  {
    relay1_state =! relay1_state;
    digitalWrite(relay1_pin , relay1_state);
    Serial.print("Relay1 State");
    Serial.print(relay1_state);
    delay(50);
  }

  else if(relay==2) {
    relay2_state =! relay2_state;
    digitalWrite(relay2_pin , relay2_state);
    Serial.print("Relay2 State");
    Serial.print(relay2_state);
    delay(50);
  }

  else if(relay==3) {
    relay1_state =! relay3_state;
    digitalWrite(relay3_pin , relay3_state);
    Serial.print("Relay3 State");
    Serial.print(relay3_state);
    delay(50);
  }

  else if(relay==4) {
    relay4_state =! relay4_state;
    digitalWrite(relay4_pin , relay4_state);
    Serial.print("Relay4 State");
    Serial.print(relay4_state);
    delay(50);
}
}