Clarify e-paper dashboard and calendar pipeline by adding inline

comments.

esphome/epaperframe.yaml

@@ -1,7 +1,10 @@
+# Device identity shared by ESPHome and Home Assistant.
 substitutions:
   name: epaperframe
   friendly_name: "Info-Dashboard"
 
+# Startup selects the default page only after Home Assistant has had time to
+# provide the sensor states needed by its display lambda.
 esphome:
   name: ${name}
   friendly_name: ${friendly_name}
@@ -18,13 +21,15 @@ esphome:
       - display.page.show: calendar # temporary for power page dev
       - component.update: epaper
 
+# ESP32 target and ESP-IDF build settings for the hardware revision in use.
 esp32:
   board: nodemcu-32s
   framework:
     type: esp-idf
-    advanced: 
+    advanced:
       minimum_chip_revision: "3.0"
 
+# Network access is required for Home Assistant state delivery and OTA updates.
 wifi:
   ssid: "Voltage-legacy"
   password: !secret voltage_legacy_psk
@@ -124,6 +129,7 @@ button:
       - display.page.show_next: epaper
       - component.update: epaper
 
+# Numeric telemetry received from Home Assistant for the environment dashboard.
 sensor:
   # WiFi signal strength
   - platform: wifi_signal
@@ -201,6 +207,7 @@ sensor:
     entity_id: sensor.radioaktive_strahlungsleistung
     id: radiation
 
+# Textual Home Assistant state, including the compact calendar payload and quote.
 text_sensor:
   - platform: homeassistant
     name: "Sun Rising ESP"
@@ -229,6 +236,8 @@ text_sensor:
     entity_id: sensor.epaper_kalenderdaten
     attribute: entries
     id: calendar_entries
+    # Refresh the e-paper only for changed agenda data while the calendar page
+    # is visible; Home Assistant may otherwise republish identical JSON.
     on_value:
       then:
         - if:
@@ -248,6 +257,8 @@ text_sensor:
 
 
 
+# Time drives panel power maintenance, the environment refresh cadence, and the
+# midnight redraw that advances the calendar and daily quote.
 time:
   - platform: homeassistant
     id: homeassistant_time
@@ -283,6 +294,7 @@ time:
               format: "Update screen on new day"
           - component.update: epaper
 
+# Visual assets used by both 1-bit e-paper pages.
 # Font definitions
 font:
   - file: "fonts/Roboto-Medium.ttf"
@@ -743,6 +755,7 @@ font:
         "󰀦", # mdi-alert
       ]
 
+# Binary logo stored in firmware for rendering without network access.
 image:
   - platform: file
     file: "epaperframe/C1024_logo_flat_bw.png"
@@ -751,10 +764,12 @@ image:
     resize: 77x40
     invert_alpha: true
 
+# Shared SPI bus for the Waveshare e-paper panel.
 spi:
   clk_pin: 23
   mosi_pin: 22
 
+# The two pages draw directly onto the 640x384 1-bit Waveshare e-paper panel.
 display:
   - platform: waveshare_epaper
     id: epaper
@@ -766,8 +781,11 @@ display:
     # full_update_every: 30 # not supported on this display
     update_interval: never
     pages:
+      # Environmental telemetry dashboard, refreshed on the 10-minute timer.
       - id: environment
         lambda: |-
+          // Snapshot all Home Assistant values once per render so each panel uses
+          // a consistent set of readings throughout this e-paper refresh.
           /* Outdoor */
           float outdoor_temp = id(temp_outdoor).state;
           int outdoor_humid = int(id(humid_outdoor).state);
@@ -791,10 +809,11 @@ display:
           float childrensroom_co2 = id(co2_childrensroom).state;
           int childrensroom_pm25 = int(id(pm25_childrensroom).state);
 
+          // Reuse one room widget layout by moving its origin across the two-column grid.
           int offsetX = 0;
           int offsetY = 0;
 
-          /* OUTSIDE */
+          /* OUTSIDE: logo, headline, and outdoor sensor summary */
           it.print(10, 10, id(sensor_unit), "Umwelt");
           /*
           Draw the outline of a rectangle with the top left at [86,21],
@@ -1138,8 +1157,11 @@ display:
             }
           }
 
+      # Calendar agenda, month grid, and daily quote; redraws when event JSON changes.
       - id: calendar
         lambda: |-
+          // Use Home Assistant time for all date labels, month calculations, and
+          // the footer, avoiding locale-dependent formatting on the ESP32.
           auto now = id(homeassistant_time).now();
           const char *months[] = {"Januar", "Februar", "März", "April", "Mai", "Juni",
                                   "Juli", "August", "September", "Oktober", "November", "Dezember"};
@@ -1149,6 +1171,8 @@ display:
           const int month = now.month;
           const int today = now.day_of_month;
 
+          // Date helpers build a Monday-first month grid and ISO-8601 week numbers
+          // without relying on platform-specific C library time functions.
           auto days_in_month = [](int calendar_year, int calendar_month) {
             const int days[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
             if (calendar_month == 2) {
@@ -1188,6 +1212,8 @@ display:
           it.line(10, 55, 355, 55);
           it.line(365, 10, 365, 352);
 
+          // Parse the compact JSON attribute produced by Home Assistant. The empty
+          // and error states below ensure a useful screen while data is unavailable.
           JsonDocument calendar_doc;
           const DeserializationError calendar_error = deserializeJson(calendar_doc, id(calendar_entries).state.c_str());
           JsonArray calendar_days = calendar_doc.as<JsonArray>();
@@ -1209,6 +1235,8 @@ display:
                 break;
               }
 
+              // A date rail occupies the left edge; event rows start alongside it
+              // and stop before the footer rather than overflowing the panel.
               const int group_y = agenda_y;
               int event_y = group_y;
               const int day_number = day["day"] | 0;
@@ -1250,6 +1278,8 @@ display:
 
 
           /* RIGHT TOP: month view, Monday-first with ISO week numbers */
+          // Draw only the five or six rows this month actually needs so no orphan
+          // week number is rendered beneath shorter months.
           char month_title[24];
           snprintf(month_title, sizeof(month_title), "%s %d", months[month - 1], year);
           it.printf(502, 18, id(sensor_unit), TextAlign::TOP_CENTER, "%s", month_title);
@@ -1298,6 +1328,7 @@ display:
           }
 
           /* RIGHT BOTTOM: daily quote selected by Home Assistant */
+          // Wrap on word boundaries into the fixed four-line, inverted quote panel.
           it.filled_rectangle(375, 220, 255, 130, COLOR_ON);
           std::string quote = "Zitat wird geladen.";
           if (id(demotivational_quote).has_state() && !id(demotivational_quote).state.empty()) {
@@ -1319,7 +1350,7 @@ display:
             while (quote_start < quote.length() && quote[quote_start] == ' ') quote_start++;
           }
 
-          /* FOOTER */
+          /* FOOTER: Footer is shared visual status: render timestamp plus a Wi-Fi-strength glyph. */
           it.strftime(614, 380, id(footer_font), TextAlign::BASELINE_RIGHT,
                       "Aktualisiert um %d.%m.%Y %H:%M", now);