diff --git a/code/src/main.c b/code/src/main.c
index 2224299..4b863f9 100644
--- a/code/src/main.c
+++ b/code/src/main.c
@@ -1,12 +1,10 @@
 #include <avr/io.h>
-#include <stdint.h>            // has to be added to use uint8_t
-#include <avr/interrupt.h>    // Needed to use interrupts
+#include <avr/interrupt.h>
 #include <avr/sleep.h>
 #include <avr/eeprom.h>
 
-// 1 count = 0,065536 s
-#define ACTIVE_COUNT_MAX 13733
-#define ANIMATION_INTERVALL 3
+#define ACTIVE_TIME 1          // minutes
+#define ANIMATION_INTERVALL 3  // counter increments (0.016 sec)
 
 uint8_t EEMEM on_off_state;
 volatile uint32_t leds = 0x00;
@@ -111,9 +109,11 @@ ISR(TIMER0_OVF_vect){
     {
         count++;
     }
-    if(active_count >= ACTIVE_COUNT_MAX){
-        active_count=0;
-        //leds_active = 0;
-        //TODO maybe sleep here
+    if(active_count >= ACTIVE_TIME * 3662){
+        leds=0;
+        write_leds();
+        eeprom_write_byte(&on_off_state, 1);
+        set_sleep_mode(SLEEP_MODE_PWR_SAVE);
+        sleep_mode();
     }
 }