HC-05 WITH ARDUINO AND RELAY

Here i am trying to help you with making this project. you can easily connect hc-05 with arduino and relay. I will give circuit diaram for that. you just need to do is that upload code to arduino remeber rx and tx pins are not connected while uploading code.

and link for app is here https://www.youtube.com/redirect?q=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F0BwuGm1VLQXLgSkVocjBPSExWc1k%2Fview%3Fusp%3Dsharing&event=video_description&v=ob7q195l8LY&redir_token=XG915_JiBPXaEITePl66V6h0Dwd8MTUxOTcwNTA4MUAxNTE5NjE4Njgx .

Here is video if you have any problem.

Here is arduino code.

int lamp1=2;
int lamp2=3;
int lamp3=4;
int music=5; 
int pc=6;
int mobile=7;
int fan=8;
int socket=9;

int Received=0;
int lamp1_state=0;
int lamp2_state=0;
int lamp3_state=0;
int music_state=0; 
int pc_state=0;
int mobile_state=0;
int fan_state=0;
int socket_state=0;

void setup(){
  
  Serial.begin(9600);
  pinMode(lamp1,OUTPUT);
  pinMode(lamp2,OUTPUT);
  pinMode(lamp3,OUTPUT);
  pinMode(music,OUTPUT);
  pinMode(pc,OUTPUT);
  pinMode(mobile,OUTPUT);
  pinMode(fan,OUTPUT);
  pinMode(socket,OUTPUT);
  
}

void loop(){
 
 if(Serial.available()>0)
 { 
    Received = Serial.read();
    
 }

if (lamp1_state == 0 && Received == '1')
  {
    digitalWrite(lamp1,HIGH);
    lamp1_state=1;
    Received=0;  
  }
if (lamp1_state ==1 && Received == '1')
  {
    digitalWrite(lamp1,LOW);
    lamp1_state=0;
    Received=0;
  }


if (lamp2_state == 0 && Received == '2')
  {
    digitalWrite(lamp2,HIGH);
    lamp2_state=1;
    Received=0;  
  }
if (lamp2_state ==1 && Received == '2')
  {
    digitalWrite(lamp2,LOW);
    lamp2_state=0;
    Received=0;
  }

if (lamp3_state == 0 && Received == '3')
  {
    digitalWrite(lamp3,HIGH);
    lamp3_state=1;
    Received=0;  
  }
if (lamp3_state ==1 && Received == '3')
  {
    digitalWrite(lamp3,LOW);
    lamp3_state=0;
    Received=0;
  }

 if (music_state == 0 && Received == '4')
  {
    digitalWrite(music,HIGH);
    music_state=1;
    Received=0;  
  }
if (music_state ==1 && Received == '4')
  {
    digitalWrite(music,LOW);
    music_state=0;
    Received=0;
  }
 
 if (pc_state == 0 && Received == '5')
  {
    digitalWrite(pc,HIGH);
    pc_state=1;
    Received=0;  
  }
if (pc_state ==1 && Received == '5')
  {
    digitalWrite(pc,LOW);
    pc_state=0;
    Received=0;
  }

 if (mobile_state == 0 && Received == '6')
  {
    digitalWrite(mobile,HIGH);
    mobile_state=1;
    Received=0;  
  }
if (mobile_state ==1 && Received == '6')
  {
    digitalWrite(mobile,LOW);
    mobile_state=0;
    Received=0;
  }

 if (fan_state == 0 && Received == '7')
  {
    digitalWrite(fan,HIGH);
    fan_state=1;
    Received=0;  
  }
if (fan_state ==1 && Received == '7')
  {
    digitalWrite(fan,LOW);
    fan_state=0;
    Received=0;
  }

 if (socket_state == 0 && Received == '8')
  {
    digitalWrite(socket,HIGH);
    socket_state=1;
    Received=0;  
  }
if (socket_state ==1 && Received == '8')
  {
    digitalWrite(socket,LOW);
    socket_state=0;
    Received=0;
  }
 
}