/*
* Bluetooh Basic: LED ON OFF - Avishkar
* Coder - Mayoogh Girish
* Website - http://bit.do/Avishkar
* Download the App : https://github.com/Mayoogh/Arduino-Bluetooth-Basic
* This program lets you to control a LED on pin 13 of arduino using a bluetooth module
  
  minor modifications by Andreas Maeurer on 05/20/2018
*/

#define RELAY1  7                  //(Andreas) from relay thing

char data = 0;                     //Variable for storing received data
void setup()
{
    Serial.begin(9600);            //Sets the baud for serial data transmission      
    pinMode(13, OUTPUT);           //Sets digital pin 13 as output pin    
    pinMode(RELAY1, OUTPUT);       //(Andreas) from relay thing
}
void loop()
{
   if(Serial.available() > 0)      // Send data only when you receive data:
   {
      data = Serial.read();        //Read the incoming data & store into data
      Serial.print(data);          //Print Value inside data in Serial monitor
      Serial.print("\n");        
      if(data == '1') {            //Checks whether value of data is equal to 1
         digitalWrite(13, HIGH);   //If value is 1 then LED turns ON
         digitalWrite(RELAY1,0);   //(Andreas) Turns ON Relay 1
      }
      else if(data == '0') {       //Checks whether value of data is equal to 0
         digitalWrite(13, LOW);    //If value is 0 then LED turns OFF
         digitalWrite(RELAY1,1);   //(Andreas) Turns Relay Off
      }
   }
}