126 lines
3.0 KiB
C++
126 lines
3.0 KiB
C++
#include <FastLED.h>
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#define DATA_PIN 13
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#include <stdint.h>
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#include <time.h>
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#include <math.h>
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#define ROWS 10
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#define COLS 11
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typedef struct {uint8_t start; uint16_t len;} word_t;
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#define ES ((word_t) {.start= 0, .len=2})
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#define IST ((word_t) {.start= 3, .len=3})
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#define FUNF_PRE ((word_t) {.start= 7, .len=4})
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#define ZEHN_PRE ((word_t) {.start= 11, .len=4})
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#define ZWANZIG ((word_t) {.start= 15, .len=7})
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#define VIERTEL ((word_t) {.start= 26, .len=7})
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#define VOR ((word_t) {.start= 33, .len=3})
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#define NACH ((word_t) {.start= 40, .len=4})
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#define HALB ((word_t) {.start= 44, .len=4})
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#define ELF ((word_t) {.start= 49, .len=3})
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#define FUNF_UHR ((word_t) {.start= 51, .len=4})
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#define EINS ((word_t) {.start= 55, .len=4})
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#define ZWEI ((word_t) {.start= 62, .len=4})
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#define DREI ((word_t) {.start= 66, .len=4})
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#define VIER ((word_t) {.start= 73, .len=4})
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#define SECHS ((word_t) {.start= 77, .len=5})
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#define ACHT ((word_t) {.start= 84, .len=4})
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#define SIEBEN ((word_t) {.start= 88, .len=6})
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#define ZWOLF ((word_t) {.start= 94, .len=5})
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#define ZEHN_UHR ((word_t) {.start= 99, .len=4})
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#define NEUN ((word_t) {.start=102, .len=4})
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#define UHR ((word_t) {.start=107, .len=3})
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word_t HOURS[] = {
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ZWOLF, EINS, ZWEI, DREI, VIER, FUNF_UHR,
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SECHS, SIEBEN, ACHT, NEUN, ZEHN_UHR, ELF
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};
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word_t PARTS[] = {
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UHR, FUNF_PRE, ZEHN_PRE, VIERTEL,
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ZWANZIG, FUNF_PRE, HALB
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};
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CRGB leds[ROWS*COLS];
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void set(word_t word) {
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CRGB color = CRGB(255,255,255);
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int dir = 1;
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// because of the snaking LED layout, we need to reverse every second row
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// i.e. flip the start on the other side and then count backwards
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if (word.start % 22 >= 11) {
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word.start = (word.start/11)*11 + 10 - (word.start % 11);
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dir = -1;
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}
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for (unsigned int i = 0; i < word.len; i++)
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leds[word.start + dir*i] = color;
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}
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void reset(void) {
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memset(&leds, 0, sizeof(leds));
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set(ES);
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set(IST);
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}
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void settime(time_t ts) {
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unsigned int second = ts % 60;
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unsigned int minute = (ts / 60) % 60;
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float fminute = (float) minute + (float) second / 60;
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minute = 5 * (unsigned int) roundf(fminute / 5);
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unsigned int timezone = 1;
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unsigned int daylight_savings = 1;
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unsigned int hour = (ts / (60*60) + timezone + daylight_savings) % 12;
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int before = 0;
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if (minute >= 25) {
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hour = (hour+1) % 12;
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before = 1;
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minute = 60-minute;
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if (minute == 35) {
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minute = 25;
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before = 0;
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}
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}
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if (minute == 25)
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before = !before;
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reset();
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if (minute != 0 && minute != 30)
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set(before ? VOR : NACH);
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set(HOURS[hour]);
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set(PARTS[minute/5]);
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if (minute/5 == 5)
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set(HALB); // '5 before half' requires additional set
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}
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void setup() {
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FastLED.addLeds<WS2812,DATA_PIN,GRB>(leds, ROWS*COLS);
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FastLED.setBrightness(64);
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}
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void loop() {
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// TODO: Get actual time from somewhere
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time_t ts = 1616970481; // UTC
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while (1) {
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settime(ts);
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FastLED.show();
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delay(200);
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ts += 5 * 60;
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};
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}
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