/* Write a program to interface Relay and Bluetooth module to switch on AC load (5W LED 
bulb, table lamp, etc) connected to relay if 1 is passed through Bluetooth and switch off 
the AC Load if 0 is send.*/
char data=0;
int  relay=8;
void setup() {
Serial.begin(9600); 
pinMode(relay, OUTPUT); 
  
}

void loop() {
if (Serial.available()>0){
  data=Serial.read();
  Serial.print(data);
  Serial.print("\n");
  if(data=='1')
  digitalWrite(relay, HIGH);
  else if (data=='0')
  digitalWrite(relay, LOW);
}  
 
}