diff --git a/.gitignore b/.gitignore
index 33531fa..096c7fc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 klock4
+!klock4/
 html_out/
diff --git a/klock4.ino b/Arduino/klock4/klock4.ino
similarity index 67%
rename from klock4.ino
rename to Arduino/klock4/klock4.ino
index 08b4aa5..9b9bc72 100644
--- a/klock4.ino
+++ b/Arduino/klock4/klock4.ino
@@ -1,15 +1,20 @@
-#include <FastLED.h>
-#define DATA_PIN 13
-
 #include <stdint.h>
 #include <time.h>
 #include <math.h>
 
+#include <FastLED.h>
+#define DATA_PIN 13
+
+#define SLEEP_DELAY 100
+#include <DeepSleepScheduler.h>
+
 #define ROWS 10
 #define COLS 11
 
 typedef struct {uint8_t start; uint16_t len;} word_t;
 
+#define _ALL      ((word_t) {.start=  0, .len=110})
+
 #define ES        ((word_t) {.start=  0, .len=2})
 #define IST       ((word_t) {.start=  3, .len=3})
 #define FUNF_PRE  ((word_t) {.start=  7, .len=4})
@@ -21,6 +26,7 @@ typedef struct {uint8_t start; uint16_t len;} word_t;
 #define HALB      ((word_t) {.start= 44, .len=4})
 #define ELF       ((word_t) {.start= 49, .len=3})
 #define FUNF_UHR  ((word_t) {.start= 51, .len=4})
+#define EIN       ((word_t) {.start= 55, .len=3})
 #define EINS      ((word_t) {.start= 55, .len=4})
 #define ZWEI      ((word_t) {.start= 62, .len=4})
 #define DREI      ((word_t) {.start= 66, .len=4})
@@ -33,8 +39,12 @@ typedef struct {uint8_t start; uint16_t len;} word_t;
 #define NEUN      ((word_t) {.start=102, .len=4})
 #define UHR       ((word_t) {.start=107, .len=3})
 
+#define ST        ((word_t) {.start= 38, .len=2})
+#define EL        ((word_t) {.start= 49, .len=2})
+#define LE        ((word_t) {.start= 60, .len=2})
+
 word_t HOURS[] = {
-  ZWOLF, EINS, ZWEI, DREI, VIER, FUNF_UHR,
+  ZWOLF, EIN, ZWEI, DREI, VIER, FUNF_UHR,
   SECHS, SIEBEN, ACHT, NEUN, ZEHN_UHR, ELF
 };
 word_t PARTS[] = {
@@ -77,6 +87,10 @@ void settime(time_t ts) {
   unsigned int daylight_savings = 1;
   unsigned int hour   = (ts / (60*60) + timezone + daylight_savings) % 12;
 
+  Serial.print(hour);
+  Serial.print(F(":"));
+  Serial.println(minute);
+
   int before = 0;
 
   if (minute >= 25) {
@@ -103,23 +117,64 @@ void settime(time_t ts) {
   if (minute/5 == 5)
     set(HALB); // '5 before half' requires additional set
 
+  // minute 0 -> "EIN Uhr"
+  // minute N -> "N vor/nach EINS"
+  if(hour == 1 && minute != 0)
+    set(EINS);
+
 }
 
-void setup() { 
+#define UPDATE_INTERVAL_S 5
+
+time_t ts = 0L; // UTC
+
+void clockUpdate() {
+
+  settime(ts);
+
+  FastLED.show();
+
+  ts += UPDATE_INTERVAL_S;
+
+  /* drift determined experimentally:
+   * ~3.5 ms "calculation time" per cycle
+   * ~12.6ms/s aka 63.6ms/cycle other drift (wakeup time?)
+   */
+  #define DRIFT_MS 65
+  #define SCHEDULE_DELAY_MS ((1000 * UPDATE_INTERVAL_S) - DRIFT_MS)
+  scheduler.scheduleDelayed(clockUpdate, SCHEDULE_DELAY_MS);
+
+}
+
+void setup() {
+
+  Serial.begin(57600);
+
   FastLED.addLeds<WS2812,DATA_PIN,GRB>(leds, ROWS*COLS);
-  FastLED.setBrightness(64);
+  FastLED.setBrightness(16);
+
+  scheduler.schedule(clockUpdate);
+
 }
 
 void loop() {
 
-  // TODO: Get actual time from somewhere
-  time_t ts = 1616970481; // UTC
+  /*
+  set(ST);
+  set(EL);
+  set(LE);
+  FastLED.show();
 
-  while (1) {
-    settime(ts);
-    FastLED.show();
-    delay(200);
-    ts += 5 * 60;
-  };
+  Serial.println(F("Please enter unix time stamp:"));
+  while (Serial.available() == 0);
+  while (Serial.available() > 0) {
+    ts = Serial.parseInt();
+    if (Serial.read() == '\n')
+      break;
+  }
+  */
+  ts = 1618048100L;
+
+  scheduler.execute();
 
 }