Published April 14, 2017 © CC BY-SA

8X8 Matrix LED Snake Game (HTML5 Web Socket)

This is the snake game for PHPoC Shield for Arduino.

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8X8 Matrix LED Snake Game (HTML5 Web Socket)

Things used in this project

Hardware components

PHPoC Shield for Arduino

Arduino UNO

Adafruit Adafuit 8x8 Bi-color LED Matrix

Jumper wires (generic)

Story

The Project

I added a web page to PHPoC Shield for Arduino(P4S-347/348) to control a snake on the 8X8 Matrix LED.

If a user presses one of the direction buttons, the direction value is sent to Arduino through HTML5 Web socket. Then the snake changes its direction.

The Snake Game

For someone who doesn't know about the Snake game. I will introduce the rules of this game. The snake moves to have a fruit. Whenever the snake eats a fruit, it gets longer. If the snake bites itself, the game is over, but if it eats 15 fruits, the user wins the game.

I changed Arduino source code base on http://fritzing.org/projects/snake-8x8-led-matrix-ada-fruit

2 way directions -> 4 way directions, go to opposite way, game result...etc.

Code

<!DOCTYPE html>
<html>
<head>
<title>PHPoC Shield - Snake Game</title>
<meta name="viewport" content="width=device-width, initial-scale=0.7, maximum-scale=0.7">
<style>
body { font-family: verdana, Helvetica, Arial, sans-serif, gulim; text-align: center; }
h1 { font-weight: bold; font-size: 25pt; }
h2 { font-weight: bold; font-size: 15pt; }
#remote { margin:0 auto; width: 500px; background: #333; border-radius: 2%; }
.direct { 
		display: inline-block; width: 100px; height: 100px;  
		font-size: 50px; color: white; line-height: 90px;
		background: #eee; margin: 8px; border-radius: 10%;
		text-align: center; font-weight: bold; 
		margin: 10px 60px;
}
</style>
<script>
var push_info = [];
var ws;
var push_length = 4;
function init()
{	
	if(ws == null)
	{
		ws = new WebSocket("ws://<?echo _SERVER("HTTP_HOST")?>/snake", "text.phpoc");
		document.getElementById("ws_state").innerHTML = "CONNECTING";
		
		ws.onopen = ws_onopen;
		ws.onclose = ws_onclose;
		ws.onmessage = ws_onmessage; 
	}
	else
		ws.close();
	
	for(var push_id = 0; push_id < push_length; push_id++)
	{
		push_info[push_id] = {state:false, identifier:null};
		update_push(push_id, false);
	}

	var remote = document.getElementById("remote");
	
    remote.addEventListener("touchstart", mouse_down);
    remote.addEventListener("touchend", mouse_up);
    remote.addEventListener("touchcancel", mouse_up);
    remote.addEventListener("mousedown", mouse_down);
    remote.addEventListener("mouseup", mouse_up);
}
function connect_onclick()
{
	if(ws == null)
	{
		var ws_host_addr = "<?echo _SERVER("HTTP_HOST")?>";
		//var debug = document.getElementById("debug");

		if((navigator.platform.indexOf("Win") != -1) && (ws_host_addr.charAt(0) == "["))
		{
			// network resource identifier to UNC path name conversion
			ws_host_addr = ws_host_addr.replace(/[\[\]]/g, '');
			ws_host_addr = ws_host_addr.replace(/:/g, "-");
			ws_host_addr += ".ipv6-literal.net";
		}

		//debug.innerHTML = "<br>" + navigator.platform + " " + ws_host_addr;
		ws = new WebSocket("ws://" + ws_host_addr + "/snake", "text.phpoc");

		document.getElementById("ws_state").innerHTML = "CONNECTING";

		ws.onopen = ws_onopen;
		ws.onclose = ws_onclose;
		ws.onmessage = ws_onmessage;
	}
	else
		ws.close();
}
function ws_onopen()
{
	document.getElementById("ws_state").innerHTML = "<font color='blue'>CONNECTED</font>";
	document.getElementById("bt_connect").innerHTML = "Disconnect";

	for(var push_id = 0; push_id < push_length; push_id++)
		update_push(push_id, false);
}
function ws_onclose()
{
	document.getElementById("ws_state").innerHTML = "<font color='gray'>CLOSED</font>";
	document.getElementById("bt_connect").innerHTML = "Connect";

	ws.onopen = null;
	ws.onclose = null;
	ws.onmessage = null;
	ws = null;

	for(var push_id = 0; push_id < push_length; push_id++)
		update_push(push_id, false);
}
function ws_onmessage(e_msg)
{
	e_msg = e_msg || window.event; // MessageEvent

	alert("msg : " + e_msg.data);
}
function update_push(push_id, state)
{
	var button = document.getElementById(push_id);
	var push = push_info[push_id];

	if(ws && (ws.readyState == 1))
	{
		if(state)
			button.style.backgroundColor = "#E9FF26";
		else
			button.style.backgroundColor = "grey";
	}
	else
		button.style.backgroundColor = "#555";

	push.state = state;

	if(!state)
		push.identifier = null;

	if(ws && (ws.readyState == 1))
	{
		if(state)
			ws.send(Number(push_id) + "\n"); 
	}
	
}
function mouse_down(event)
{
	//var debug = document.getElementById("debug");

	var push_id = event.target.id;	
	
	if(event.changedTouches)
	{
		
		for(var touch_id = 0; touch_id < event.changedTouches.length; touch_id++)
		{
			var touch = event.changedTouches[touch_id];

			if(push_id < push_length)
			{
				var push = push_info[push_id];

				if(push.state == false)
				{
					update_push(push_id, true);
					push.identifier = touch.identifier;

				//	debug.innerHTML += ("+" + push_id + "/" + touch.identifier + " ");
				}
				else
				{
					update_push(push_id, false);
				}

				//debug.innerHTML += (push_id + " ");
			}
		}
	}
	else
	{
		if(push_id < push_length)
		{
				var push = push_info[push_id];
				if(push.state == false)
				{
					update_push(push_id, true);

					//debug.innerHTML += ("+" + push_id + "/" + touch.identifier + " ");
				}
				else
				{
					update_push(push_id, false);
				}
				
			//debug.innerHTML += (push_id + " ");
		}
	}

	event.preventDefault();
}

function mouse_up(event)
{
	var debug = document.getElementById("debug");
	var push_id;

	//debug.innerHTML = "";

	if(event.changedTouches)
	{
		for(var touch_id = 0; touch_id < event.changedTouches.length; touch_id++)
		{
			var touch = event.changedTouches[touch_id];

			for(var push_id = 0; push_id < push_length; push_id++)
			{
				if(touch.identifier == push_info[push_id].identifier)
					break;
			}

			if(push_id < push_length)
			{
				update_push(push_id, false);
				//debug.innerHTML += ("-" + push_id + "/" + touch.identifier + " ");
			}
		}
	}
	else
	{
		for(var push_id = 0; push_id < push_length; push_id++)
		{
			if(push_info[push_id].state)
			{
				update_push(push_id, false);
				break;
			}
		}
	}

	event.preventDefault();
}

window.onload = init;
</script>
</head>

<body>
<h1>Snake Game</h1>
<br /><br />
<div id="remote">
	<div class="direct" id="0">↑</div><br />
	<div class="direct" id="1">←</div>
	<div class="direct" id="2">→</div><br />
	<div class="direct" id="3">↓</div>
</div>
<br /><br />
<h2>WebSocket <font id="ws_state" color="gray">CLOSED</font></h2>
<button id="bt_connect" type="button" onclick="connect_onclick();">Connect</button>
<span id="debug"></span>
</body>
</html>

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

  Designed specifically to work with the Adafruit LED Matrix backpacks 
  ----> http://www.adafruit.com/products/872
  ----> http://www.adafruit.com/products/871
  ----> http://www.adafruit.com/products/870

  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
 ****************************************************/

// Snake on 8x8Matrix 
// 2013-06-15 JorgVisch (http://fritzing.org/projects/snake-8x8-led-matrix-ada-fruit)
// 2017-04-12 Amy Kim

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_LEDBackpack.h>
#include "SPI.h"
#include "Phpoc.h"

PhpocServer server(80);

// LED face
static const uint8_t PROGMEM
  smile_bmp[] =
  { B00111100,
    B01000010,
    B10100101,
    B10000001,
    B10100101,
    B10011001,
    B01000010,
    B00111100 },
  frown_bmp[] =
  { B00111100,
    B01000010,
    B10100101,
    B10000001,
    B10011001,
    B10100101,
    B01000010,
    B00111100 };
    
// direction
const int TOP    = 0;
const int RIGHT  = 1;
const int BOTTOM = 2;
const int LEFT   = 3;

// Snake
const int MAX_SNAKE_LENGTH = 15;

// Variables
Adafruit_BicolorMatrix matrix = Adafruit_BicolorMatrix();   // Display
int direction = TOP;                               // direction of movement
int snakeX[MAX_SNAKE_LENGTH];                      // X-coordinates of snake
int snakeY[MAX_SNAKE_LENGTH];                      // Y-coordinates of snake
int snakeLength = 1;                               // nr of parts of snake
unsigned long prevTime = 0;                        // for gamedelay (ms)
unsigned long delayTime = 500;                     // Game step in ms

int fruitX, fruitY;
unsigned long fruitPrevTime = 0;
unsigned long fruitBlinkTime = 1000/250;
int fruitLed = LED_RED;
int matrixColor;
  
void setup(){
  Serial.begin(9600);
  while(!Serial)
    ;

  Phpoc.begin(PF_LOG_SPI | PF_LOG_NET);
  server.beginWebSocket("snake");
 
  Serial.print("WebSocket server address : ");
  Serial.println(Phpoc.localIP());  

  Serial.println("Game is started.");
  randomSeed(analogRead(0));
  
  // Init led matrix  
  matrix.begin(0x70);  
  matrix.setRotation(3); 
  
  // init snake
  snakeX[0] = 4;
  snakeY[0] = 7;
  for(int i=1; i<MAX_SNAKE_LENGTH; i++)
    snakeX[i] = snakeY[i] = -1;
  
  makeFruit();
 
  printString("S");
}

void loop(){
    checkButtons();
    
    unsigned long currentTime = millis();
    if(currentTime - prevTime >= delayTime)
    {
      nextstep(); 
      prevTime = currentTime;
    }
    
    draw();      
}

void checkButtons(){

  // wait for a new client:
  PhpocClient client = server.available();
  
  if (client) 
  {
    if (client.available() > 0) 
    {
      // read the bytes incoming from the client:
      char thisChar = client.read();
      
      if(thisChar == '0')
        direction = TOP;
      if(thisChar == '1')
        direction = LEFT;
      if(thisChar == '2')
        direction = RIGHT;
      if(thisChar == '3')
        direction = BOTTOM;   
    }
  }
}

void draw(){
  matrix.clear();
  drawSnake();
  drawFruit();
  matrix.writeDisplay();
}

void drawSnake(){
  for(int i=0; i<snakeLength; i++)
    matrix.drawPixel(snakeX[i], snakeY[i], LED_GREEN);  
}

void drawFruit(){
  if(inPlayField(fruitX, fruitY)){
    unsigned long currenttime = millis();
    if(currenttime - fruitPrevTime >= fruitBlinkTime)
    {
      fruitLed = (fruitLed == LED_RED) ? LED_OFF : LED_RED;
      fruitPrevTime = currenttime;
    }
    matrix.drawPixel(fruitX, fruitY, fruitLed);
  }
}

boolean inPlayField(int x, int y){
  return (x>=0) && (x<8) && (y>=0) && (y<8);
}

void nextstep(){  
  for(int i = snakeLength; i > 0; i--)
  {
    if((direction == RIGHT) && (snakeX[0]-snakeLength == 7))
      snakeX[0] = -1;
    else if((direction == LEFT) && (snakeX[0]+ snakeLength == 0))
      snakeX[0] = 8;
    else 
      snakeX[i] = snakeX[i-1];
    
    if((direction == TOP) && (snakeY[0]+snakeLength == 0))
      snakeY[0] = 8;
    else if((direction == BOTTOM) && (snakeY[0]-snakeLength == 7))
      snakeY[0] = -1;
    else 
      snakeY[i] = snakeY[i-1];      
  }
  
  switch(direction)
  {
    case TOP:
      snakeY[0] = snakeY[0]-1;
      break;
    case RIGHT:
      snakeX[0] = snakeX[0]+1;
      break;
    case BOTTOM:
      snakeY[0] = snakeY[0]+1;
      break;
    case LEFT:
      snakeX[0]=snakeX[0]-1;
      break;
  }
  
  if((snakeX[0] == fruitX) && (snakeY[0] == fruitY))
  {
    snakeLength++;
    if(snakeLength < MAX_SNAKE_LENGTH)
      makeFruit();
    else 
      fruitX = fruitY = -1;
   
  }
  snakeCheck();  
}

void makeFruit(){
  int x, y;
  x = random(0, 8);
  y = random(0, 8);
  while(isPartOfSnake(x, y)){
    x = random(0, 8);
    y = random(0, 8);
  }
  fruitX = x;
  fruitY = y;
}

boolean isPartOfSnake(int x, int y){
  for(int i=0; i<snakeLength-1; i++)
  {
    if((x == snakeX[i]) && (y == snakeY[i]))
      return true;
  }
  return false;
}

void snakeCheck(){  
    for(int i=1; i<snakeLength; i++)
    {
      // snake touches itself
      if((snakeX[0] == snakeX[i]) && (snakeY[0] == snakeY[i])) 
        userLose();
    }
    if (snakeLength == MAX_SNAKE_LENGTH)
      userWin();
}

void userLose(){
  Serial.println("Game Over");
  printString("O");
  
  matrix.clear();
  matrix.drawBitmap(0, 0, frown_bmp, 8, 8, LED_RED);
  matrix.writeDisplay();
  delay(1000);

  snakeLength = 1;
  setup();
  loop();
}

void userWin(){
  Serial.println("You Win");
  printString("W");
  
  matrix.clear();
  matrix.drawBitmap(0, 0, smile_bmp, 8, 8, LED_GREEN);
  matrix.writeDisplay();
  delay(1000);  
    
  snakeLength = 1;
  setup();
  loop();
}

void printString(String str){
  String matrixComment;

  matrix.setTextWrap(false);  // we dont want text to wrap so it scrolls nicely
  matrix.setTextSize(1);

  if (str == "O")
  {
    matrixComment = "Game Over!";
    matrixColor = LED_RED;
  }
  else if (str == "W")
  {
    matrixComment = "You Win!";
    matrixColor = LED_GREEN;  
  }
  else if (str == "S")
  {
    matrixComment = "Go!";
    matrixColor = LED_YELLOW;  
  }
  else 
    matrixColor = LED_YELLOW;
  
  matrix.setTextColor(matrixColor);
  
  for (int8_t x=7; x>=-60; x--) 
  {
    matrix.clear();
    matrix.setCursor(x,0);
    matrix.print(matrixComment);
    matrix.writeDisplay();
    delay(70);
  }  
}

Credits

hmkim

1 project • 24 followers

8X8 Matrix LED Snake Game (HTML5 Web Socket)

Things used in this project

Hardware components

Story

The Project

The Snake Game

Schematics

Connections

Code

PHPoC Shield source code

Arduino Source code

Credits

hmkim

Comments

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8X8 Matrix LED Snake Game (HTML5 Web Socket)

8X8 Matrix LED Snake Game (HTML5 Web Socket)

Things used in this project

Hardware components

Story

The Project

The Snake Game

Schematics

Connections

Code

PHPoC Shield source code

Arduino Source code

Credits

hmkim

Comments

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