Arduino code for bluetooth remote controller.

//Copyright Jorgga 2012
//jorgga@gmail.com
//You may modify and use this code but you must give me credit.
//You may not use this code for profitable applications.

//Muuttujat
const int NextButton = 2; //Play nappula porttiin 2
const int StopButton = 3; //Stop 3
const int PlayPause = 4;  //Play/pause 4
const int PrevButton = 5; //Prev 5
int ButtonStates[4] = {0,0,0,0}; //Nappuloiden tilat
boolean Playing = true; //Toistetaanko, Juu Muutentaan false jos pausea painetaan
boolean Connected = false; //Ei oo yhistetty oletuksena
int Delay = 1000; //Pingauksen aikaväli
String InputString = ""; //Minne tulevat viestit piillotetaan
boolean StringComplete = false; //Onko tuleva viesti valmis
long Pinged = 0; //Edellisen pingin aika

//Ashetuksia
void setup() {
Serial.begin(9600); //Seriaalin nopeus
pinMode(NextButton, INPUT); //Portit nappuloille
pinMode(StopButton, INPUT); //sisäänpäin
pinMode(PlayPause, INPUT);
pinMode(PrevButton, INPUT);

InputString.reserve(200); //Jotain bufferia

}
void loop() {
if (Serial.available() > 0) seriaaliEventti(); //Mikäli sarjadataa tulee

if(Connected == false)
{
    Ping(); //pingataan jos ei oo yhteyttä
}
else
{
   Ping(); //Pingataan kuitenkin
   Buttons();
}



if(StringComplete)
{
 Serial.print("Answer: ");
 Serial.print(InputString);

 if(InputString == "Pong\n")
 {
  //Serial.print("Set Connected True\n");
  Delay = 10000;
  Pinged = millis() / 1000;
  //Serial.print(Pinged);
  //Serial.print("\n");
  Connected = true;

 }

 StringComplete = false;
 InputString = "";
}
}

//Loopin loppu

void Ping()
{


  if((millis() % Delay) == 0)
  {
  Serial.print("Ping ");
  Serial.print(millis()/1000);
  Serial.print("\n");
  delay(1);
  } else if((millis() / 1000) > (Pinged + 10))
  {
   Connected = false;
   Delay = 1000;
  }
}


void Buttons()
{
 //Buttons Begin
if(digitalRead(NextButton) == HIGH)
{
  ButtonStates[0] = 1;
} else if(digitalRead(StopButton) == HIGH)
{
  ButtonStates[1] = 1;
} else if(digitalRead(PlayPause) == HIGH)
{
  ButtonStates[2] = 1;
} else if(digitalRead(PrevButton) == HIGH)
{
  ButtonStates[3] = 1;
}


if(digitalRead(NextButton) == LOW && ButtonStates[0] == 1)
{
   Serial.print("Next\n");
   ResetButtons();
} else if(digitalRead(StopButton) == LOW && ButtonStates[1] == 1)
{
   Serial.print("Stop\n");
   ResetButtons();
} else if(digitalRead(PlayPause) == LOW && ButtonStates[2] == 1)
{
   if(Playing == true)
   {
     Playing = false;
    Serial.print("Pause\n");

   } else if(Playing == false)
   {
     Playing = true;
    Serial.print("Play\n");

   }
   ResetButtons();
} else if(digitalRead(PrevButton) == LOW && ButtonStates[3] == 1)
{
   Serial.print("Prev\n");
   ResetButtons();
}
//Buttons End

}

void ResetButtons()
{
  for(int i = 0;i<4;i++)
  {
   ButtonStates[i] = 0;
  }
}

void seriaaliEventti()
{
  while (Serial.available())
{
 char inChar = (char)Serial.read();
 InputString += inChar;
 if(inChar == '\n')
 {
  StringComplete = true;
 }
}
}