diff --git a/Makefile b/Makefile
index 22a804b..8e07030 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ CC=msp430-gcc
 CFLAGS=-O3 -g0 -Wall -mmcu=msp430g2553 -std=gnu99 -I hottislib
 LDFLAGS=-mmcu=msp430g2553
 
-blinky1.elf:	main.o led.o time.o pattern.o PontCoopScheduler.o
+blinky1.elf:	main.o led.o time.o pattern.o PontCoopScheduler.o myrand.o
 	$(CC) -o $@ $(LDFLAGS) $^
 
 PontCoopScheduler.o:	hottislib/PontCoopScheduler.c hottislib/PontCoopScheduler.h
diff --git a/myrand.c b/myrand.c
new file mode 100644
index 0000000..7322a17
--- /dev/null
+++ b/myrand.c
@@ -0,0 +1,115 @@
+#include "myrand.h"
+
+
+uint8_t numbers[] = { 
+220,
+60,
+136,
+163,
+230,
+44,
+255,
+40,
+252,
+66,
+201,
+204,
+142,
+232,
+33,
+26,
+59,
+188,
+68,
+92,
+93,
+58,
+69,
+158,
+193,
+132,
+30,
+152,
+128,
+126,
+23,
+202,
+182,
+126,
+47,
+119,
+131,
+104,
+102,
+38,
+119,
+24,
+203,
+244,
+24,
+216,
+179,
+71,
+186,
+202,
+246,
+64,
+102,
+67,
+168,
+255,
+21,
+104,
+138,
+23,
+220,
+134,
+16,
+196,
+39,
+105,
+214,
+240,
+27,
+122,
+120,
+175,
+72,
+123,
+88,
+229,
+247,
+203,
+85,
+143,
+8,
+232,
+207,
+113,
+236,
+7,
+82,
+195,
+254,
+178,
+77,
+32,
+182,
+150,
+223,
+183,
+246,
+255,
+104,
+72,
+};
+
+uint8_t myrand() {
+    static uint16_t i = 0;
+    uint8_t r = numbers[i];
+    i++;
+    if (i > sizeof(numbers)) {
+        i = 0;
+    }
+    return r;
+}
\ No newline at end of file
diff --git a/myrand.h b/myrand.h
new file mode 100644
index 0000000..9cd51f9
--- /dev/null
+++ b/myrand.h
@@ -0,0 +1,9 @@
+#ifndef MYRAND_H_
+#define MYRAND_H_
+
+#include <stdlib.h>
+
+uint8_t myrand();
+
+
+#endif // MYRAND_H_
\ No newline at end of file
diff --git a/pattern.c b/pattern.c
index 462b6b3..8f4c483 100644
--- a/pattern.c
+++ b/pattern.c
@@ -2,7 +2,7 @@
 #include "led.h"
 #include "PontCoopScheduler.h"
 #include <stdlib.h>
-
+#include "myrand.h"
 
 /*
  * traversing the whole matrix
@@ -73,6 +73,7 @@ void patternExec() {
 void patternExec() {
     static uint8_t state = 0;
     static uint8_t column = 0;
+    static uint8_t stay = 0;
 
     switch (state) {
         case 0:
@@ -86,23 +87,47 @@ void patternExec() {
             break;
         case 1: 
             // select new column, row 2
-            column = ((uint8_t) rand()) & 0x3;
+            column = myrand() & 0x3;
             ledSetMatrix(column, 2, RED);
+            stay = myrand() & 0xf;
             state = 2;
             break;
         case 2:
+            // stay
+            if (stay == 0) {
+                state = 3;
+            }
+            stay--;
+            break;
+        case 3:
             // same column, row 1
             ledSetMatrix(column, 1, RED);
             ledSetMatrix(column, 2, OFF);
-            state = 3;
-            break;
-        case 3:
-            // same column, row 0
-            ledSetMatrix(column, 0, RED);
-            ledSetMatrix(column, 1, OFF);
+            stay = myrand() & 0xf;
             state = 4;
             break;
         case 4:
+            // stay
+            if (stay == 0) {
+                state = 5;
+            }
+            stay--;
+            break;
+        case 5:
+            // same column, row 0
+            ledSetMatrix(column, 0, RED);
+            ledSetMatrix(column, 1, OFF);
+            stay = myrand() & 0xf;
+            state = 6;
+            break;
+        case 6:
+            // stay
+            if (stay == 0) {
+                state = 7;
+            }
+            stay--;
+            break;
+        case 7:
             // same column, row 0 off
             ledSetMatrix(column, 0, OFF);
             state = 1;
@@ -116,5 +141,5 @@ void patternExec() {
 
 
 void patternInit() {
-    schAdd(patternExec, NULL, 0, 1000);
+    schAdd(patternExec, NULL, 0, 100);
 }
\ No newline at end of file