Android app + Bluetooth + Arduino control

Arduino part

The connection between the bluetooth module and Arduino is just a normal serial comunication where we connect the Rx pin of the module to the Tx pin of the arduino and Tx pin of the module to the Rx pin of the Arduino. I'll use a normal relay module. Connect 5 volts and gnd to the module and the enable pin as well. I'll use pin 11 this time to turn on my lamp. Connect the other 3 enable pin to other relays. The example is made with just one relay.

The next code will receive the sended characters via serial comunication. It will decide when to turn to high or low each of the declared outputs. Opening the serial monitor we could see each sended character.

You can download the Room Control Sketch here:



//---------ELECTRONOOBS----------//
//--------BT app control---------//


int lamp=11;
int vent=12;
int light=8;
int pc=7;

int Received=0;
int light_state =0;
int vent_state = 0;
int pc_state = 0;


void setup(){
  
  Serial.begin(9600);
  pinMode(lamp,OUTPUT);
  pinMode(vent,OUTPUT);
  pinMode(light,OUTPUT);
  pinMode(pc,OUTPUT);
  
}

void loop(){
 
 if(Serial.available()>0)
 { 
    
    Received = Serial.read();
    char Rec = char(Received);
    if (Rec != '0')
    {
    Serial.println(Rec); //This is to visualise the received character
    }
    
 }

////////////////LIGHT/////////////////////
if (light_state == 0 && Received == '1')
  {
    digitalWrite(light,HIGH);
    light_state=1;
    Received=0;  
  }
if (light_state ==1 && Received == '1')
  {
    digitalWrite(light,LOW);
    light_state=0;
    Received=0;
  }
///////////////////////////////////////////



////////////////VENT/////////////////////
if (vent_state == 0 && Received == 'a')
  {
    digitalWrite(vent,HIGH);
    vent_state=1;
    Received=0;  
  }
if (vent_state ==1 && Received == 'a')
  {
    digitalWrite(vent,LOW);
    vent_state=0;
    Received=0;
  }
///////////////////////////////////////////




////////////////PC/////////////////////
if (pc_state == 0 && Received == '2')
  {
    digitalWrite(pc,HIGH);
    pc_state=1;
    Received=0;  
  }
if (pc_state ==1 && Received == '2')
  {
    digitalWrite(pc,LOW);
    pc_state=0;
    Received=0;
  }
///////////////////////////////////////////




  
////////////////LAMP/////////////////////
 if (Received =='8'){
   digitalWrite(lamp,HIGH);   
  }  
 if (Received == '9'){
 digitalWrite(lamp,LOW);
 }
 ///////////////////////////////////////////

 
 
}

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Android app + Bluetooth + Arduino control

Arduino part

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