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• Scrambled

  Rhea Rae • 20 hours ago • 0 comments

  If screen is scrambled switch pin D13 and D11.

  -RR

• ST7920 Pin-Out

  Rhea Rae • 20 hours ago • 0 comments

  Use EXP 3 Header!

  -RR

• Ender Clock-Duino v1.0 Sketch

  Rhea Rae • 20 hours ago • 0 comments

  #include <Arduino.h>
  #include <U8g2lib.h>
  #include <EEPROM.h>

  // ================= LCD =================
  const uint8_t PIN_LCD_CS = 10; // CS/RS
  U8G2_ST7920_128X64_1_HW_SPI u8g2(U8G2_R0, PIN_LCD_CS, U8X8_PIN_NONE);

  // ================= ENCODER =================
  const uint8_t PIN_ENC_A   = 2;
  const uint8_t PIN_ENC_B   = 3;
  const uint8_t PIN_ENC_BTN = 4;

  // If your encoder changes 2 numbers per click, set this to 2.
  // If it changes 1 per click, leave at 4.
  const int8_t TRANSITIONS_PER_DETENT = 4;

  // ================= UI TIMING =================
  const uint16_t LONG_MS     = 700;
  const uint16_t DEBOUNCE_MS = 25;

  // ================= EEPROM =================
  const int EEPROM_SIG_ADDR   = 0;
  const int EEPROM_TIME_ADDR  = 1;               // uint32_t (4 bytes)
  const int EEPROM_CHIME_ADDR = EEPROM_TIME_ADDR + 4; // uint8_t
  const int EEPROM_VOL_ADDR   = EEPROM_CHIME_ADDR + 1; // uint8_t
  const uint8_t EEPROM_SIG    = 0xA5;            // marker that EEPROM has valid data

  // ================= BUZZER =================
  const uint8_t PIN_BUZZER = 8;

  // Chime settings (editable, saved)
  bool    chime_enabled = true;
  uint8_t chime_volume_percent = 18; // editable 0..100 (0 = silent)

  // ================= CLOCK CORE =================
  uint32_t clock_sec = 0;
  uint32_t last_tick_ms = 0;

  // ================= SET MODE FIELDS =================
  bool set_mode = false;

  uint8_t edit_hour12 = 12;   // 1..12
  uint8_t edit_min    = 0;    // 0..59
  uint8_t edit_sec    = 0;    // 0..59 (frozen in SET)
  bool    edit_pm     = false; // false=AM, true=PM

  bool    edit_chime_enabled = true;
  uint8_t edit_volume_percent = 18;

  enum Sel : uint8_t { SEL_HOUR, SEL_MIN, SEL_AMPM, SEL_CHIME, SEL_VOL, SEL_TEST };
  Sel sel = SEL_HOUR;

  uint32_t saved_banner_until_ms = 0;

  // Track last hour we chimed so we only do it once per hour
  int8_t last_chimed_h24 = -1;

  // ================= ENCODER ISR =================
  volatile int16_t enc_delta = 0;
  volatile uint8_t enc_prev  = 0;

  static const int8_t ENC_TAB[16] = {
    0, -1,  1,  0,
    1,  0,  0, -1,
   -1,  0,  0,  1,
    0,  1, -1,  0
  };

  void enc_isr() {
    uint8_t a = digitalRead(PIN_ENC_A) ? 1 : 0;
    uint8_t b = digitalRead(PIN_ENC_B) ? 1 : 0;
    uint8_t cur = (a << 1) | b;
    uint8_t idx = (enc_prev << 2) | cur;
    enc_prev = cur;
    enc_delta += ENC_TAB[idx];
  }

  // ================= BUTTON =================
  bool btn_last_raw = true;
  bool btn_stable   = true;
  uint32_t btn_change_ms = 0;
  uint32_t btn_down_ms   = 0;
  bool long_fired = false;

  static void poll_button(bool &short_press, bool &long_press) {
    short_press = false;
    long_press  = false;

    bool raw = digitalRead(PIN_ENC_BTN); // HIGH idle, LOW pressed
    uint32_t now = millis();

    if (raw != btn_last_raw) {
      btn_last_raw = raw;
      btn_change_ms = now;
    }

    if ((now - btn_change_ms) > DEBOUNCE_MS) {
      if (btn_stable != raw) {
        btn_stable = raw;
        if (btn_stable == LOW) {
          btn_down_ms = now;
          long_fired = false;
        } else {
          if (!long_fired) short_press = true;
        }
      }
    }

    if (btn_stable == LOW && !long_fired && (now - btn_down_ms) >= LONG_MS) {
      long_fired = true;
      long_press = true;
    }
  }

  // ================= HELPERS =================
  static uint32_t wrap_day(uint32_t sec) { return sec % 86400UL; }

  static void sec_to_hms(uint32_t sec, uint8_t &h24, uint8_t &m, uint8_t &s) {
    sec = wrap_day(sec);
    h24 = sec / 3600UL;
    m   = (sec / 60UL) % 60UL;
    s ...

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