timer_clock_code

#include <Wire.h>
#include <Adafruit_MCP23017.h>
#include <Adafruit_RGBLCDShield.h>

Adafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield();

#define RED 0x1
#define YELLOW 0x3
#define GREEN 0x2
#define TEAL 0x6
#define BLUE 0x4
#define VIOLET 0x5
#define WHITE 0x7

const int player1Pin = 6;
const int player2Pin = 7;

void setup() {

  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.setBacklight(WHITE);
  lcd.setCursor(0, 0);
  pinMode(player1Pin, INPUT);
  pinMode(player2Pin, INPUT);
  digitalWrite(player1Pin, HIGH);
  digitalWrite(player2Pin, HIGH);
  UpdatePlayer1Time();
  UpdatePlayer2Time();

}

double player1Time = 300000;
int player1Minutes = 0;
int player1Seconds = 0;
double player1LastCheck = millis();
double player2Time = 300000;
int player2Minutes = 0;
int player2Seconds = 0;
double player2LastCheck = millis();
bool isPlayer1Turn = true;
bool gameOver = false;
int player1ButtonState = 0;
int player2ButtonState = 0;


void loop() {

  //Check the status of the buttons attached to this project.
  player1ButtonState = digitalRead(player1Pin);
  player2ButtonState = digitalRead(player2Pin);

  //If both buttons are pressed, reset the game.
  if (player1ButtonState == LOW && player2ButtonState == LOW) {
    RestartGame();
  }

  //If the game is over, start the loop again.
  if (gameOver) {
    return;
  }

  //If the player 1 button is pressed, switch to player one's turn.
  if (player1ButtonState == LOW) {
    StartPlayer1Turn();
  }

  //If the player 2 button is pressed, switch to player two's turn.
  if (player2ButtonState == LOW) {
    StartPlayer2Turn();
  }

  //Whichever player is currently active--update their clock.
  if (isPlayer1Turn) {
    UpdatePlayer1Time();
  } else {
    UpdatePlayer2Time();
  }
}

void UpdatePlayer1Time() {
  //Tell the LCD screen that we're going to be writing on the first line, where player one's time is displayed.
  lcd.setCursor(0, 0);
  //Update the variable that contains the number of milliseconds left on player one's timer.
  // millis() is a built-in function that returns the number of milliseconds that have elapsed
  //since the Arduino was turned on. We check how many milliseconds  have elapsed since last time
  //we ran this function.
  player1Time -= ((millis() - player1LastCheck));
  player1LastCheck = millis();

  //If the player is out of time, they lose and the game is over.
  if (player1Time <= 0) {
    gameOver = true;
    lcd.print("LOSE");
    return;
  }

  //Separate out the minutes and seconds from the time value (which is in milliseconds).
  player1Minutes = floor(player1Time / 60000);
  player1Seconds = floor(player1Time / 1000) - player1Minutes * 60;

  //Print the minutes, then a colon, then the seconds.
  lcd.print(player1Minutes);
  lcd.print(":");
  if (player1Seconds < 10) {
    lcd.print(0);
  }
  lcd.print(player1Seconds);
}

void UpdatePlayer2Time() {
  lcd.setCursor(0, 1);
  player2Time -= ((millis() - player2LastCheck));
  if (player2Time <= 0) {
    gameOver = true;
    lcd.print("LOSE");
    return;
  }
  player2LastCheck = millis();
  player2Minutes = floor(player2Time / 60000);
  player2Seconds = floor(player2Time / 1000) - player2Minutes * 60;
  lcd.print(player2Minutes);
  lcd.print(":");
  if (player2Seconds < 10) {
    lcd.print(0);
  }
  lcd.print(player2Seconds);
}

void StartPlayer1Turn () {
  if (isPlayer1Turn) {
    return;
  }
  lcd.setBacklight(RED);
  isPlayer1Turn = true;
  player1LastCheck = millis();
}

void StartPlayer2Turn () {
  if (!isPlayer1Turn) {
    return;
  }
  lcd.setBacklight(TEAL);
  isPlayer1Turn = false;
  player2LastCheck = millis();
}

void RestartGame() {
  StartPlayer1Turn();
  player1Time = 300000;
  player2Time = 300000;
  gameOver = false;
  UpdatePlayer1Time();
  UpdatePlayer2Time();
}