/*

*/
String inputs;
#define relay1 2 //Connect relay1 to pin 9
#define relay2 3 //Connect relay2 to pin 8
#define relay3 4 //Connect relay3 to pin 7
#define relay4 5 //Connect relay4 to pin 6

void setup() {
  Serial.begin(9600); //Set rate for communicating with phone
  pinMode(relay1, OUTPUT); //Set relay1 as an output
  pinMode(relay2, OUTPUT); //Set relay2 as an output
  pinMode(relay3, OUTPUT); //Set relay1 as an output
  pinMode(relay4, OUTPUT); //Set relay2 as an output
  digitalWrite(relay1, LOW); //Switch relay1 off
  digitalWrite(relay2, LOW); //Swtich relay2 off
  digitalWrite(relay3, LOW); //Switch relay3 off
  digitalWrite(relay4, LOW); //Swtich relay4 off  
}

void loop() {
  while(Serial.available()) //Check if there are available bytes to read
  {
    delay(10); //Delay to make it stable
    char c = Serial.read(); //Conduct a serial read
    if (c == '#'){ break; } //Stop the loop once # is detected after a word
    inputs += c; //Means inputs = inputs + c
  }
  if (inputs.length() >0) 
  { 
    Serial.println(inputs);

    if(inputs == "A")      { digitalWrite(relay1, LOW); }
    else if(inputs == "a") { digitalWrite(relay1, HIGH); }
    else if(inputs == "B") { digitalWrite(relay2, LOW); }
    else if(inputs == "b") { digitalWrite(relay2, HIGH); }
    else if(inputs == "C") { digitalWrite(relay3, LOW); }
    else if(inputs == "c") { digitalWrite(relay3, HIGH); }
    else if(inputs == "D") { digitalWrite(relay4, LOW); }
    else if(inputs == "d") { digitalWrite(relay4, HIGH); }
    inputs="";
  }  
}