/* REACTION TIME (with 2 leds) v1.1
 *  Luis Andrés Gonzalez
 * Reaction time original version from http://www.instructables.com/id/Arduino-Reaction-Time-Tester/?ALLSTEPS
 * Send data to processing via the Serial Port original from By Elaine Laguerta http://url/of/online/tutorial.cc
*/
int switchPin = 6;  // pin where the button will be connected
int ledPin1 = 2 ;   // LED that signals starting of the game
int ledPin2 = 8 ;   // LED that lights to test the reaction time

// declare some variables:
boolean lastButton = LOW;
boolean currentButton = LOW;
boolean Started = false;
boolean timer = false;
long startTime;
long endTime;
int randomTime;
long beginTime;
float elapsedTime;


void setup()
{
  // Setup button and LEDs:
  pinMode(switchPin, INPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);

  // Begin serial communication
  Serial.begin(9600);
}
boolean debounce(boolean last)
{
  boolean current = digitalRead(switchPin);
  if(last != current)
  {
    delay(5);
    current = digitalRead(switchPin);
  }
  return current;
}


void loop()
{
  // see if button pressed
  currentButton = debounce(lastButton);
  if(lastButton == LOW && currentButton == HIGH)
  {
    if(Started==false){
      Started=true;
      randomTime = random(4,10);
      randomTime = randomTime*1000;
      Blink();
      beginTime=millis();

    }
    else{
      if((millis()-beginTime)>=randomTime){
          Stop();
          Started=false;
          timer=false;
      }

      else{
        Started=false;
        timer=false;
        Serial.println("You pressed the button too soon !");
        for(int i=0; i<3; i++){
          Blink();
        }
      }
    }
  }

  lastButton = currentButton;

  if(Started == true && (millis()-beginTime)>=randomTime && timer==false){
    Serial.println("Start");
    timer=true;
    Start();
  }
}






void Start(){
  startTime = millis();
  digitalWrite(ledPin1, HIGH);
}

void Blink(){
  digitalWrite(ledPin2, HIGH);
  delay(100);
  digitalWrite(ledPin2, LOW);
  delay(100);
}

void Stop(){
  endTime = millis();
  elapsedTime = (endTime - startTime)+5;
  elapsedTime = elapsedTime/1000;
  Serial.print("Time Seconds: ");
  Serial.println(elapsedTime);
  digitalWrite(ledPin1, LOW);

}