Tutorial for Arduino Beginners PART III

Explore the endless possibilities of the MaxMatrix and create a pong game with it.

Jan 15, 2019

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pong

maxmatrix2719

playable game

Devices & Components

Arduino Uno Rev3

AA Batteries

Male/Female Jumper Wires

Rotary potentiometer (generic)

4xAA battery holder

MaxMatrix2719 8x8

Hardware & Tools

Computer

Software & Tools

Arduino IDE

Project description

Code

Pong

c_cpp

You will need to download the Timer and LEDControl Libraries

1#include "LedControl.h"
2#include "Timer.h"
3 
4#define POTPIN
5  A5 // Potentiometer
6#define PADSIZE 3
7#define BALL_DELAY 200
8#define GAME_DELAY
9  10
10#define BOUNCE_VERTICAL 1
11#define BOUNCE_HORIZONTAL -1
12#define NEW_GAME_ANIMATION_SPEED
13  50
14#define HIT_NONE 0
15#define HIT_CENTER 1
16#define HIT_LEFT 2
17#define
18  HIT_RIGHT 3
19 
20//#define DEBUG 1
21 
22byte sad[] = {
23B00000000,
24B01000100,
25B00010000,
26B00010000,
27B00000000,
28B00111000,
29B01000100,
30B00000000
31};
32
33  
34byte smile[] = {
35B00000000,
36B01000100,
37B00010000,
38B00010000,
39B00010000,
40B01000100,
41B00111000,
42B00000000
43};
44
45  
46Timer timer;
47 
48LedControl lc = LedControl(12,11,10,1);
49 
50byte direction;
51  // Wind rose, 0 is north
52int xball;
53int yball;
54int yball_prev;
55byte
56  xpad;
57int ball_timer;
58 
59void setSprite(byte *sprite){
60    for(int r
61  = 0; r < 8; r++){
62        lc.setRow(0, r, sprite[r]);
63    }
64}
65 
66void
67  newGame() {
68    lc.clearDisplay(0);
69    // initial position
70    xball =
71  random(1, 7);
72    yball = 1;
73    direction = random(3, 6); // Go south
74
75    for(int r = 0; r < 8; r++){
76        for(int c = 0; c < 8; c++){
77            lc.setLed(0,
78  r, c, HIGH);
79            delay(NEW_GAME_ANIMATION_SPEED);
80        }
81    }
82
83    setSprite(smile);
84    delay(1500);
85    lc.clearDisplay(0);
86}
87 
88void
89  setPad() {
90    xpad = map(analogRead(POTPIN), 0, 1020, 8 - PADSIZE, 0);
91}
92
93  
94void debug(const char* desc){
95#ifdef DEBUG
96    Serial.print(desc);
97
98    Serial.print(" XY: ");
99    Serial.print(xball);
100    Serial.print(",
101  ");
102    Serial.print(yball);
103    Serial.print(" XPAD: ");
104    Serial.print(xpad);
105
106    Serial.print(" DIR: ");
107    Serial.println(direction);
108#endif
109}
110
111  
112int checkBounce() {
113    if(!xball || !yball || xball == 7 || yball == 6){
114
115        int bounce = (yball == 0 || yball == 6) ? BOUNCE_HORIZONTAL : BOUNCE_VERTICAL;
116#ifdef
117  DEBUG
118        debug(bounce == BOUNCE_HORIZONTAL ? "HORIZONTAL" : "VERTICAL");
119#endif
120
121        return bounce;
122    }
123    return 0;
124}
125 
126int getHit() {
127
128    if(yball != 6 || xball < xpad || xball > xpad + PADSIZE){
129        return
130  HIT_NONE;
131    }
132    if(xball == xpad + PADSIZE / 2){
133        return HIT_CENTER;
134
135    }
136    return xball < xpad + PADSIZE / 2 ? HIT_LEFT : HIT_RIGHT;
137}
138
139  
140bool checkLoose() {
141    return yball == 6 && getHit() == HIT_NONE;
142}
143
144  
145void moveBall() {
146    debug("MOVE");
147    int bounce = checkBounce();
148
149    if(bounce) {
150        switch(direction){
151            case 0:
152                direction
153  = 4;
154            break;
155            case 1:
156                direction =
157  (bounce == BOUNCE_VERTICAL) ? 7 : 3;
158            break;
159            case 2:
160
161                direction = 6;
162            break;
163            case 6:
164
165                direction = 2;
166            break;
167            case 7:
168
169                direction = (bounce == BOUNCE_VERTICAL) ? 1 : 5;
170            break;
171
172            case 5:
173                direction = (bounce == BOUNCE_VERTICAL) ?
174  3 : 7;
175            break;
176            case 3:
177                direction
178  = (bounce == BOUNCE_VERTICAL) ? 5 : 1;
179            break;
180            case
181  4:
182                direction = 0;
183            break;
184        }
185        debug("->");
186
187    }
188 
189    // Check hit: modify direction is left or right
190    switch(getHit()){
191
192        case HIT_LEFT:
193            if(direction == 0){
194                direction
195  =  7;
196            } else if (direction == 1){
197                direction =
198  0;
199            }
200        break;
201        case HIT_RIGHT:
202            if(direction
203  == 0){
204                direction = 1;
205            } else if(direction == 7){
206
207                direction = 0;
208            }
209        break;
210    }
211 
212
213    // Check orthogonal directions and borders ...
214    if((direction == 0 &&
215  xball == 0) || (direction == 4 && xball == 7)){
216        direction++;
217    }
218
219    if(direction == 0 && xball == 7){
220        direction = 7;
221    }
222    if(direction
223  == 4 && xball == 0){
224        direction = 3;
225    }
226    if(direction == 2
227  && yball == 0){
228        direction = 3;
229    }
230    if(direction == 2 && yball
231  == 6){
232        direction = 1;
233    }
234    if(direction == 6 && yball == 0){
235
236        direction = 5;
237    }
238    if(direction == 6 && yball == 6){
239        direction
240  = 7;
241    }
242    
243    // "Corner" case
244    if(xball == 0 && yball ==
245  0){
246        direction = 3;
247    }
248    if(xball == 0 && yball == 6){
249
250        direction = 1;
251    }
252    if(xball == 7 && yball == 6){
253        direction
254  = 7;
255    }
256    if(xball == 7 && yball == 0){
257        direction = 5;
258
259    }
260 
261    yball_prev = yball;
262    if(2 < direction && direction < 6)
263  {
264        yball++;
265    } else if(direction != 6 && direction != 2) {
266        yball--;
267
268    }
269    if(0 < direction && direction < 4) {
270        xball++;
271    } else
272  if(direction != 0 && direction != 4) {
273        xball--;
274    }
275    xball
276  = max(0, min(7, xball));
277    yball = max(0, min(6, yball));
278    debug("AFTER
279  MOVE");
280}
281 
282void gameOver() {
283    setSprite(sad);
284    delay(1500);
285
286    lc.clearDisplay(0);
287}
288 
289void drawGame() {
290    if(yball_prev != yball){
291
292        lc.setRow(0, yball_prev, 0);
293    }
294    lc.setRow(0, yball, byte(1
295  << (xball)));
296    byte padmap = byte(0xFF >> (8 - PADSIZE) << xpad) ;
297#ifdef
298  DEBUG
299    //Serial.println(padmap, BIN);
300#endif
301    lc.setRow(0, 7, padmap);
302}
303
304  
305void setup() {
306  // The MAX72XX is in power-saving mode on startup,
307  //
308  we have to do a wakeup call
309  pinMode(POTPIN, INPUT);
310 
311  lc.shutdown(0,false);
312
313  // Set the brightness to a medium values
314  lc.setIntensity(0, 8);
315  // and
316  clear the display
317  lc.clearDisplay(0);
318  randomSeed(analogRead(0));
319#ifdef
320  DEBUG
321  Serial.begin(9600);
322  Serial.println("Pong");
323#endif
324  newGame();
325
326  ball_timer = timer.every(BALL_DELAY, moveBall);
327}
328 
329void loop() {
330
331    timer.update();
332    // Move pad
333    setPad();
334#ifdef DEBUG
335    Serial.println(xpad);
336#endif
337
338    // Update screen
339    drawGame();
340    if(checkLoose()) {
341        debug("LOOSE");
342
343        gameOver();
344        newGame();
345    }
346    delay(GAME_DELAY);
347}

#include "LedControl.h"
#include "Timer.h"
 
#define POTPIN
  A5 // Potentiometer
#define PADSIZE 3
#define BALL_DELAY 200
#define GAME_DELAY
  10
#define BOUNCE_VERTICAL 1
#define BOUNCE_HORIZONTAL -1
#define NEW_GAME_ANIMATION_SPEED
  50
#define HIT_NONE 0
#define HIT_CENTER 1
#define HIT_LEFT 2
#define
  HIT_RIGHT 3
 
//#define DEBUG 1
 
byte sad[] = {
B00000000,
B01000100,
B00010000,
B00010000,
B00000000,
B00111000,
B01000100,
B00000000
};

  
byte smile[] = {
B00000000,
B01000100,
B00010000,
B00010000,
B00010000,
B01000100,
B00111000,
B00000000
};

  
Timer timer;
 
LedControl lc = LedControl(12,11,10,1);
 
byte direction;
  // Wind rose, 0 is north
int xball;
int yball;
int yball_prev;
byte
  xpad;
int ball_timer;
 
void setSprite(byte *sprite){
    for(int r
  = 0; r < 8; r++){
        lc.setRow(0, r, sprite[r]);
    }
}
 
void
  newGame() {
    lc.clearDisplay(0);
    // initial position
    xball =
  random(1, 7);
    yball = 1;
    direction = random(3, 6); // Go south

    for(int r = 0; r < 8; r++){
        for(int c = 0; c < 8; c++){
            lc.setLed(0,
  r, c, HIGH);
            delay(NEW_GAME_ANIMATION_SPEED);
        }
    }

    setSprite(smile);
    delay(1500);
    lc.clearDisplay(0);
}
 
void
  setPad() {
    xpad = map(analogRead(POTPIN), 0, 1020, 8 - PADSIZE, 0);
}

  
void debug(const char* desc){
#ifdef DEBUG
    Serial.print(desc);

    Serial.print(" XY: ");
    Serial.print(xball);
    Serial.print(",
  ");
    Serial.print(yball);
    Serial.print(" XPAD: ");
    Serial.print(xpad);

    Serial.print(" DIR: ");
    Serial.println(direction);
#endif
}

  
int checkBounce() {
    if(!xball || !yball || xball == 7 || yball == 6){

        int bounce = (yball == 0 || yball == 6) ? BOUNCE_HORIZONTAL : BOUNCE_VERTICAL;
#ifdef
  DEBUG
        debug(bounce == BOUNCE_HORIZONTAL ? "HORIZONTAL" : "VERTICAL");
#endif

        return bounce;
    }
    return 0;
}
 
int getHit() {

    if(yball != 6 || xball < xpad || xball > xpad + PADSIZE){
        return
  HIT_NONE;
    }
    if(xball == xpad + PADSIZE / 2){
        return HIT_CENTER;

    }
    return xball < xpad + PADSIZE / 2 ? HIT_LEFT : HIT_RIGHT;
}

  
bool checkLoose() {
    return yball == 6 && getHit() == HIT_NONE;
}

  
void moveBall() {
    debug("MOVE");
    int bounce = checkBounce();

    if(bounce) {
        switch(direction){
            case 0:
                direction
  = 4;
            break;
            case 1:
                direction =
  (bounce == BOUNCE_VERTICAL) ? 7 : 3;
            break;
            case 2:

                direction = 6;
            break;
            case 6:

                direction = 2;
            break;
            case 7:

                direction = (bounce == BOUNCE_VERTICAL) ? 1 : 5;
            break;

            case 5:
                direction = (bounce == BOUNCE_VERTICAL) ?
  3 : 7;
            break;
            case 3:
                direction
  = (bounce == BOUNCE_VERTICAL) ? 5 : 1;
            break;
            case
  4:
                direction = 0;
            break;
        }
        debug("->");

    }
 
    // Check hit: modify direction is left or right
    switch(getHit()){

        case HIT_LEFT:
            if(direction == 0){
                direction
  =  7;
            } else if (direction == 1){
                direction =
  0;
            }
        break;
        case HIT_RIGHT:
            if(direction
  == 0){
                direction = 1;
            } else if(direction == 7){

                direction = 0;
            }
        break;
    }
 

    // Check orthogonal directions and borders ...
    if((direction == 0 &&
  xball == 0) || (direction == 4 && xball == 7)){
        direction++;
    }

    if(direction == 0 && xball == 7){
        direction = 7;
    }
    if(direction
  == 4 && xball == 0){
        direction = 3;
    }
    if(direction == 2
  && yball == 0){
        direction = 3;
    }
    if(direction == 2 && yball
  == 6){
        direction = 1;
    }
    if(direction == 6 && yball == 0){

        direction = 5;
    }
    if(direction == 6 && yball == 6){
        direction
  = 7;
    }
    
    // "Corner" case
    if(xball == 0 && yball ==
  0){
        direction = 3;
    }
    if(xball == 0 && yball == 6){

        direction = 1;
    }
    if(xball == 7 && yball == 6){
        direction
  = 7;
    }
    if(xball == 7 && yball == 0){
        direction = 5;

    }
 
    yball_prev = yball;
    if(2 < direction && direction < 6)
  {
        yball++;
    } else if(direction != 6 && direction != 2) {
        yball--;

    }
    if(0 < direction && direction < 4) {
        xball++;
    } else
  if(direction != 0 && direction != 4) {
        xball--;
    }
    xball
  = max(0, min(7, xball));
    yball = max(0, min(6, yball));
    debug("AFTER
  MOVE");
}
 
void gameOver() {
    setSprite(sad);
    delay(1500);

    lc.clearDisplay(0);
}
 
void drawGame() {
    if(yball_prev != yball){

        lc.setRow(0, yball_prev, 0);
    }
    lc.setRow(0, yball, byte(1
  << (xball)));
    byte padmap = byte(0xFF >> (8 - PADSIZE) << xpad) ;
#ifdef
  DEBUG
    //Serial.println(padmap, BIN);
#endif
    lc.setRow(0, 7, padmap);
}

  
void setup() {
  // The MAX72XX is in power-saving mode on startup,
  //
  we have to do a wakeup call
  pinMode(POTPIN, INPUT);
 
  lc.shutdown(0,false);

  // Set the brightness to a medium values
  lc.setIntensity(0, 8);
  // and
  clear the display
  lc.clearDisplay(0);
  randomSeed(analogRead(0));
#ifdef
  DEBUG
  Serial.begin(9600);
  Serial.println("Pong");
#endif
  newGame();

  ball_timer = timer.every(BALL_DELAY, moveBall);
}
 
void loop() {

    timer.update();
    // Move pad
    setPad();
#ifdef DEBUG
    Serial.println(xpad);
#endif

    // Update screen
    drawGame();
    if(checkLoose()) {
        debug("LOOSE");

        gameOver();
        newGame();
    }
    delay(GAME_DELAY);
}

Downloadable files

Pong

All done!

Pong

All done!

Pong

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