Forked from remcoder/game of life with 8x8 bicolor led matrix
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August 29, 2015 14:11
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/* | |
I recently got one of those 8x8 LED matrices and I was playing with some Game of Life patterns when I found this pretty repeating pattern. I found it by starting with some random patterns. If you look closely you can see the pattern becoming a mirrored version of itself halfway through. Apparently the pattern doesn't repeat like this on an infinite grid but on this wrapping 8x8 grid it does ;-) | |
FYI, the LED matrix is a bicolor one (green/red) and has an I2C interface (http://www.adafruit.com/products/902). I'm using the colors as follows: | |
- newly created cells are green | |
- cells that are at least 10 generations old are red | |
- other living cells are yellow (simultaneously green+red) | |
It's hookup up to my Arduino Uno r3. | |
here's a video: http://www.youtube.com/watch?v=Ee2hOaQ2RDI | |
*/ | |
#include <Wire.h> | |
#include "Adafruit_LEDBackpack.h" | |
#include "Adafruit_GFX.h" | |
boolean cells[8][8]; | |
Adafruit_BicolorMatrix matrix = Adafruit_BicolorMatrix(); | |
// game of life | |
int next[8][8]; | |
void setup() { | |
Serial.begin(9600); | |
Serial.write("hello"); | |
randomSeed(analogRead(0)); | |
for (int r=0 ; r<8 ; r++) { | |
for (int c=0 ; c<8 ; c++) { | |
if (random(2) >0) | |
next[r][c] = 1; | |
} | |
} | |
matrix.begin(0x70); // pass in the address | |
} | |
void loop() { | |
game_of_life(); | |
} | |
int current[8][8] = | |
{ {0,0,0,0,0,0,0,0}, | |
{0,0,0,0,0,0,0,0}, | |
{0,0,1,1,1,0,0,0}, | |
{0,0,0,0,0,0,0,0}, | |
{0,0,0,0,0,0,0,0}, | |
{0,0,0,0,0,0,0,0}, | |
{0,0,0,0,0,0,0,0}, | |
{0,0,0,0,0,0,0,0} }; | |
int mod(int a) { return (a+8)%8; } | |
void game_of_life() { | |
matrix.clear(); | |
// draw | |
for (int r=0 ; r<8 ; r++) { | |
for (int c=0 ; c<8 ; c++) { | |
int color; | |
if (next[r][c] == 0) | |
color = 0; | |
else if (next[r][c] == 1) | |
color = LED_GREEN; | |
else if (next[r][c] > 10) | |
color = LED_RED; | |
else | |
color = LED_YELLOW; | |
matrix.drawPixel(c,r,color); | |
} | |
} | |
matrix.writeDisplay(); | |
// calc next state | |
for (int r=0 ; r<8 ; r++) { | |
for (int c=0 ; c<8 ; c++) { | |
// count alive neighbors | |
int alive = 0; | |
alive += current[mod(r+1)][mod(c) ] != 0; | |
alive += current[mod(r) ][mod(c+1)] != 0; | |
alive += current[mod(r-1)][mod(c) ] != 0; | |
alive += current[mod(r) ][mod(c-1)] != 0; | |
alive += current[mod(r+1)][mod(c+1)] != 0; | |
alive += current[mod(r-1)][mod(c-1)] != 0; | |
alive += current[mod(r+1)][mod(c-1)] != 0; | |
alive += current[mod(r-1)][mod(c+1)] != 0; | |
if (current[r][c]) | |
if (alive < 2 || alive > 3) | |
next[r][c] = 0; | |
else | |
next[r][c] = current[r][c] + 1; | |
else | |
if (alive == 3) | |
next[r][c] = 1; | |
} | |
} | |
for (int r=0 ; r<8 ; r++) { | |
for (int c=0 ; c<8 ; c++) { | |
current[r][c] = next[r][c]; | |
} | |
} | |
delay(100); | |
} |
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