COVID-19 Ultimate Solution | TOUCHLESS Switch

/*CREARED BY- SUSMIT RUDRA
This is a very simple code used to collect required data from the app we will make and send it to the arduino.
Read the comments of each line very carefully to understand the concept.*/



#include<SoftwareSerial.h>
SoftwareSerial BT(10,11);    // CONNECT TX PIN OF HC05 TO PIN 10 OF ARDUINO and CONNECT RX PIN OF HC05 TO PIN 11 OF AEDUINO

String read_Data;

int relay1=4;              // Initialising the pin numbers with particular variable names for easy understanding
int relay2=5;
int relay3=6;
int relay4=7;

int val1=0;                // Initialising the variables to 0 value
int val2=0;
int val3=0;
int val4=0;


void setup() {    // put your setup code here, to run :
  
  BT.begin(9600);
  Serial.begin(9600);
  pinMode(relay1,OUTPUT);
  pinMode(relay2,OUTPUT);
  pinMode(relay3,OUTPUT);
  pinMode(relay4,OUTPUT);

  digitalWrite(relay1,HIGH);
  digitalWrite(relay2,HIGH);
  digitalWrite(relay3,HIGH);
  digitalWrite(relay4,HIGH);
  
  }

void loop() {
  // put your main code here, to run repeatedly:

while( BT.available())
{

delay(10);
char d=BT.read();
read_Data= read_Data+d;       // WE GET THE DATA RECEIVED FROM THE BLUETOOTH
}

if(read_Data.length()>0)
{
Serial.println(read_Data);       // WE DISPLAY THAT DATA IN OUR OUTPUT FOR MODIFICATIONS

if(read_Data=="RELAY1")
{
  val1=digitalRead(relay1);
  if(val1==0)
  {
    digitalWrite(relay1,HIGH);
    val1=1;
  }
  else
  {
    digitalWrite(relay1,LOW);
    val1=0;
  }
  delay(200);
}

if(read_Data=="RELAY2")
{
  val1=digitalRead(relay2);
  if(val2==0)
  {
    digitalWrite(relay2,HIGH);
    val2=1;
  }
  else
  {
    digitalWrite(relay2,LOW);
    val2=0;
  }
  delay(200);
}


if(read_Data=="RELAY 3")
{
  val1=digitalRead(relay3);
  if(val3==0)
  {
    digitalWrite(relay3,HIGH);
    val3=1;
  }
  else
  {
    digitalWrite(relay3,LOW);
    val3=0;
  }
  delay(200);
}


if(read_Data=="RELAY4")
{
  val1=digitalRead(relay4);
  if(val4==0)
  {
    digitalWrite(relay4,HIGH);
    val4=1;
  }
  else
  {
    digitalWrite(relay4,LOW);
    val4=0;
  }
  delay(200);
}

  read_Data="";

}
  
}