Using HC-06 module.
Arduino code
I threw this circuit togeather in 10min and it works ok.
Arduino code:
void setup()
{
// set digital pin to control as an output
pinMode(13, OUTPUT);
// set the data rate for the SoftwareSerial port
Serial.begin(9600);
// Send test message to other device
Serial.println("Hello from Arduino");
}
char a; // stores incoming character from other device
void loop()
{
if (Serial.available())
{
a=(Serial.read());
if (a=='1')
{
digitalWrite(13, HIGH);
Serial.println("LED on");
}
if (a=='2')
{
digitalWrite(13, LOW);
Serial.println("LED off");
}
// you can add more "if" statements with other characters to add more commands
}
}