Add U8X8 carousel screens

include/carousel.h

@@ -0,0 +1,31 @@
+#ifndef CAROUSEL_H
+#define CAROUSEL_H
+
+#include <Arduino.h>
+#include <U8g2lib.h>
+
+#include "screens.h"
+
+class Carousel {
+ public:
+  Carousel(Screen *screens, size_t screenCount);
+
+  void begin(unsigned long now);
+  void update(unsigned long now);
+  void next(unsigned long now);
+  void render(U8X8 &display) const;
+  bool consumeDirty();
+
+ private:
+  Screen *screens_;
+  size_t screenCount_;
+  size_t currentIndex_;
+  unsigned long nextAutoAdvanceAt_;
+  unsigned long manualModeUntil_;
+  bool dirty_;
+
+  void scheduleNextAdvance(unsigned long now);
+  void drawIndicators(U8X8 &display) const;
+};
+
+#endif

include/display_config.h

@@ -0,0 +1,22 @@
+#ifndef DISPLAY_CONFIG_H
+#define DISPLAY_CONFIG_H
+
+#include <Arduino.h>
+
+namespace display_config {
+
+constexpr uint8_t kNextButtonPin = A4;
+
+constexpr unsigned long kAutoAdvanceIntervalMs = 10000;
+constexpr unsigned long kManualHoldIntervalMs = 60000;
+constexpr unsigned long kButtonDebounceMs = 150;
+constexpr unsigned long kDebugLogIntervalMs = 500;
+
+constexpr uint8_t kDisplayColumns = 16;
+constexpr uint8_t kDisplayRows = 8;
+constexpr uint8_t kIndicatorRow = 7;
+constexpr uint8_t kIndicatorSpacing = 2;
+
+}  // namespace display_config
+
+#endif

include/screens.h

@@ -0,0 +1,16 @@
+#ifndef SCREENS_H
+#define SCREENS_H
+
+#include <U8g2lib.h>
+
+struct Screen {
+  const char *title;
+  void (*render)(U8X8 &display);
+};
+
+void renderTimeScreen(U8X8 &display);
+void renderWeatherScreen(U8X8 &display);
+void renderTemperatureScreen(U8X8 &display);
+void renderHumidityScreen(U8X8 &display);
+
+#endif