/*
 Arduino Reaction Timer using an RGB LCD 16x2 Character Display
   Derek Molloy, DCU, Ireland.
   Using LCD library from: 
   http://www.arduino.cc/en/Tutorial/LiquidCrystal 
*/
#include <TM1637Display.h>

// Set up the display with 4 bits - R/W tied to GND
int CLK1 = 5;
int DIO1 = 6;
int CLK2 = 7;
int DIO2 = 8;
int CLK3 = 9;
int DIO3 = 10;


int ledPin         =  2;    // red stop LED
int buttonPin      =  3;    // reaction timer button

TM1637Display display1 = TM1637Display(CLK1, DIO1); // LED display
TM1637Display display2 = TM1637Display(CLK2, DIO2); // LED display
TM1637Display display3 = TM1637Display(CLK3, DIO3); // LED display




// States of execution
long randomDelayTime;        // holds the random time amount
boolean prepareState = true; // in introduction mode
boolean isTiming = false;    // timing the press state
long timerStartMillis;       // the time when the timer started
long timerEndMillis;         // the time when the timer finished


// makes a dash
   const uint8_t blank[] = {
     SEG_G,  // -
   };

// Setup function - called only once
void setup() {
  display1.setBrightness(5);
  display2.setBrightness(5);
  display3.setBrightness(5);

  pinMode(ledPin, OUTPUT);       // red LED is an output
  pinMode(buttonPin, INPUT);     // button is an input
  randomSeed(analogRead(0));     // use unconnected pin to seed random sequence
}

void loop() {
  display1.clear();


  if(prepareState){                // prepare state - give out the instruction to press button
    //if (digitalRead(buttonPin)==true)  // if the button is pressed
    {
      randomDelayTime = random(10000);  // this is the random amount to be used 0-10 seconds
      while (digitalRead(buttonPin)==true) {} // wait until the button is released
      prepareState = false;       // finished prepare state - lets move on
  display2.clear();
                 display2.showNumberDecEx(randomDelayTime, false,2,4 );

    }
  }
  else // not in prepare state
  {
     if (!isTiming)                // the timer isn't running, so we are pausing for random amount
     {
        delay(randomDelayTime);      // delay for the random amount
        digitalWrite(ledPin, HIGH);  // when finished - set red LED high
        isTiming = true;             // now we are ready to start timing reactions
        timerStartMillis = millis(); // get the current time 
     }
     else // now we are timing person's reaction
     {
        if (digitalRead(buttonPin)==true)  // when they press the button
        {

           timerEndMillis = millis(); // get the current time
           digitalWrite(ledPin, LOW); // turn off the red led
           long difference = timerEndMillis - timerStartMillis; // time taken is difference between times
           if (difference == 0)            // If the difference is 0 they held the button - or are supermen!
           {}
           
           else  // valid time
           {  // Final message
  display1.clear();

        if (digitalRead(buttonPin)==true)  // when they press the button
{}
                 display1.showNumberDecEx(difference, false,2,4 );}
           long i = 7000 - difference;
           delay(i); 
                     // leave the message on the screen for 5 seconds
           isTiming = false;               // ready to start timing again
           prepareState = true;            // ready to start all over
        }}}}