/*************************************************** 
  This is a library for our I2C LED Backpacks

  Designed specifically to work with the Adafruit LED 7-Segment backpacks 
  ----> http://www.adafruit.com/products/881
  ----> http://www.adafruit.com/products/880
  ----> http://www.adafruit.com/products/879
  ----> http://www.adafruit.com/products/878

  These displays use I2C to communicate, 2 pins are required to 
  interface. There are multiple selectable I2C addresses. For backpacks
  with 2 Address Select pins: 0x70, 0x71, 0x72 or 0x73. For backpacks
  with 3 Address Select pins: 0x70 thru 0x77

  Adafruit invests time and resources providing this open source code, 
  please support Adafruit and open-source hardware by purchasing 
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.  
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#include <Wire.h> // Enable this line if using Arduino Uno, Mega, etc.
#include <Adafruit_GFX.h>
#include "Adafruit_LEDBackpack.h"

Adafruit_7segment matrix = Adafruit_7segment();

int cdMinutes = 4;
int cdSecFirst = 5;
int cdSecSecond = 9;
int timerDecrement = 1000;

int powerPin = 18;
int powerButton = 0;

int triggerPin = 20;
int triggerButton = 0;

int triggerLEDPin = 7;

int boom = 0;


void setup() {
#ifndef __AVR_ATtiny85__
  Serial.begin(9600);
  Serial.println("7 Segment Backpack Test");
#endif
  matrix.begin(0x70);

  // initialize the LED pin as an output:
  pinMode(triggerLEDPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(powerPin, INPUT);
  pinMode(triggerPin, INPUT);

}

void loop() {

matrix.clear(); // Clears display for initial loop
matrix.setBrightness(15);
matrix.writeDisplay();
digitalWrite(triggerLEDPin, LOW);


do
{

  powerButton = digitalRead(powerPin); // Checks to see if power button is on
  
} while (powerButton == 0); // Continues checking power button until it is turned on

boolean drawDots = true;
    matrix.writeDigitNum(0, 0);
    matrix.writeDigitNum(1, 5);
    matrix.drawColon(drawDots);
    matrix.writeDigitNum(3, 0);
    matrix.writeDigitNum(4, 0);
 
    matrix.writeDisplay();

do // Keeps checking for trigger press

{

triggerButton = digitalRead(triggerPin);

} while (triggerButton == 0);

digitalWrite(triggerLEDPin, HIGH); 

do
{
    matrix.writeDigitNum(0, 0);
    matrix.writeDigitNum(1, cdMinutes);
    matrix.drawColon(drawDots);
    matrix.writeDigitNum(3, cdSecFirst);
    matrix.writeDigitNum(4, cdSecSecond);

    matrix.writeDisplay();
    delay(timerDecrement);

if ((cdSecFirst == 0) && (cdSecSecond == 0))

{
  cdSecFirst = 6;
  --cdMinutes;  
}

if (cdSecSecond == 0)

    {
      cdSecSecond = 10;
    --cdSecFirst;
    }

--cdSecSecond;

if (cdMinutes < 0) 

  {
    boom = 1;    
  }
} while (boom == 0);

do

{

powerButton = digitalRead(powerPin); // Checks to see if power button is off
  
} while (powerButton == 1);

cdMinutes = 4;
cdSecFirst = 5;
cdSecSecond = 9;
boom = 0;
}