About this app

Source Code and Pin Mode

Arduino UNO to Bluetooth module PIN Mode : RX pin 10 and TX pin 11.

Code:
#include
SoftwareSerial mySerial(10, 11); //Pin 10=TX, Pin 11=RX Bluetooth TX,RX

#define relay1 2 //Relay IN1 connected to PinOut 2 Arduino
#define relay2 3 //Relay IN2 connected to PinOut 3 Arduino
#define relay3 4 //Relay IN3 connected to PinOut 4 Arduino
#define relay4 5 //Relay IN4 connected to PinOut 5 Arduino

char val;
void setup()
{
pinMode(relay1,OUTPUT);
pinMode(relay2,OUTPUT);
pinMode(relay3,OUTPUT);
pinMode(relay4,OUTPUT);
digitalWrite(relay1,HIGH);
digitalWrite(relay2,HIGH);
digitalWrite(relay3,HIGH);
digitalWrite(relay4,HIGH);

mySerial.begin(9600);
Serial.begin(9600);
}

void loop() {//cek data serial from bluetooth android App
if( mySerial.available() >0 )
{
val = mySerial.read();
Serial.println(val);
}
//Relay is on

/*
--->you can connected to relay modul 4 channel
Serial data sending from Arduino Bluetooth Relay 4CH.apk
data '1'-'4' to on is Ralay CH 1-4
data 'A'-'D' to off is Ralay CH 1-4
data '9' to on ALL CH 1-4
data 'I' to off ALL CH 1-4
*/
if( val == '1' )
{
digitalWrite(relay1,LOW);
}
else if( val == '2' )
{
digitalWrite(relay2,LOW);
}
else if( val == '3' )
{
digitalWrite(relay3,LOW);
}
else if( val == '4' )
{
digitalWrite(relay4,LOW);
}
//relay all on
else if( val == '9' )
{
digitalWrite(relay1,LOW);
digitalWrite(relay2,LOW);
digitalWrite(relay3,LOW);
digitalWrite(relay4,LOW);
}
//relay is off
else if( val == 'A' )
{
digitalWrite(relay1,HIGH);
}
else if( val == 'B' )
{
digitalWrite(relay2,HIGH);
}
else if( val == 'C' )
{
digitalWrite(relay3,HIGH);
}
else if( val == 'D' )
{
digitalWrite(relay4,HIGH);
}
//relay all off
else if( val == 'I' )
{
digitalWrite(relay1,HIGH);
digitalWrite(relay2,HIGH);
digitalWrite(relay3,HIGH);
digitalWrite(relay4,HIGH);
}

}

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App Permissions

Allows applications to discover and pair bluetooth devices.
Allows applications to connect to paired bluetooth devices.