Animation based on an idea taken from Komputerstrukturen by Peter Struycken.

Author: FransFaase

software/StruyckenKS69/StruyckenKS69.ino

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+//After Komputerstrukturen 1969/70 by Peter Struycken with MAX7219
+
+/*
+     * dataPin		pin on the Arduino where data gets shifted out
+     * clockPin		pin for the clock
+     * csPin		pin for selecting the device
+     * numDevices	maximum number of devices that can be controled
+LedControl(int dataPin, int clkPin, int csPin, int numDevices=1);
+*/
+
+#include "LedControl.h"     //Imports the library
+
+static const int DATA_PIN = 20;
+static const int CLK_PIN  = 5;
+static const int CS_PIN   = 21;
+
+LedControl lc = LedControl(DATA_PIN, CLK_PIN, CS_PIN, 1);
+
+#define brightness 1       //Values from 1 to 15 to set the brightness
+int analogPin = 0;          //analogPin for the random seed data
+
+unsigned char world[8][8];
+unsigned char state[4][4];
+int prev_i;
+int prev_j;
+
+void setWorld()
+{
+  for (int i = 0; i < 8; i++)
+    for (int j = 0; j < 8; j++)
+       world[i][j] = 0;
+
+  for (int i = 0; i < 4; i++)
+    for (int j = 0; j < 4; j++)
+    {
+      int i2 = i * 2;
+      int j2 = j * 2;
+      unsigned char s = state[i][j];
+      if (s == 0)
+        world[i2][j2] = 1;
+      else if (s == 1)
+        world[i2][j2+1] = 1;
+      else if (s == 2)
+        world[i2+1][j2+1] = 1;
+      else
+        world[i2+1][j2] = 1;
+    }
+  for (int i = 0; i < 8; i++)
+  {
+    int r = 0;
+    for (int j = 0; j < 8; j++)
+      r = (r << 1) | world[i][j];
+    lc.setColumn(0, 7-i, r);
+  }
+}
+
+void setup() {
+  lc.shutdown(0, false);
+  lc.setIntensity(0, brightness);
+  lc.clearDisplay(0);
+  randomSeed(analogRead(analogPin));
+  for (int i = 0; i < 4; i++)
+    for (int j = 0; j < 4; j++)
+      state[i][j] = random(4);
+  setWorld();
+  prev_i = 0;
+  prev_j = 0;
+}
+
+/*******************************************************************************/
+
+void loop()
+{
+  delay(300);
+
+  int i = random(3);
+  if (i >= prev_i)
+    i++;
+  int j = random(3);
+  if (j >= prev_j)
+    j++;
+  int old_s = state[i][j];
+  state[i][j] = (old_s + (random(2) ? 1 : 3)) % 4; 
+  for (int i = 0; i < 3; i++)
+    for (int j = 0; j < 3; j++)
+      if (   state[i][j] == 2 && state[i][j+1] == 3
+          && state[i+1][j+1] == 0 && state[i+1][j] == 1)
+      {
+        state[i][j] = old_s;
+        return;
+      }
+  setWorld();
+  delay(1000);
+  prev_i = i;
+  prev_j = j;
+
+}