Add arduino (led) version

klock4.ino

@@ -31,7 +31,6 @@ typedef struct {uint8_t start; uint16_t len;} word_t;
 #define ZWOLF     ((word_t) {.start= 94, .len=5})
 #define ZEHN_UHR  ((word_t) {.start= 99, .len=4})
 #define NEUN      ((word_t) {.start=102, .len=4})
-//#define UHR       ((word_t) {.start=107, .len=3})
 #define UHR       ((word_t) {.start=107, .len=3})
 
 word_t HOURS[] = {
@@ -49,6 +48,8 @@ CRGB leds[ROWS*COLS];
 void set(word_t word) {
   CRGB color = CRGB(255,255,255);
   int dir = 1;
+  // because of the snaking LED layout, we need to reverse every second row
+  // i.e. flip the start on the other side and then count backwards
   if (word.start % 22 >= 11) {
     word.start = (word.start/11)*11 + 10 - (word.start % 11);
     dir = -1;
@@ -111,6 +112,7 @@ void setup() {
 
 void loop() {
 
+  // TODO: Get actual time from somewhere
   time_t ts = 1616970481; // UTC
 
   while (1) {