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src/main.cpp
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303
src/main.cpp
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#include <ESP8266WiFi.h>
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#include <ESP8266HTTPClient.h>
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#include <LiquidCrystal_I2C.h>
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#include <settings.h>
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#define BUTTON_PIN D3 // GPIO-Pin verbunden mit Taster (D3 entspricht GPIO0)
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const uint32_t connectTimeoutMs = 10000; // WLAN Timeout
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// Globale Variablen
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unsigned long lastUpdateTime = 0; // Zeitstempel der letzten Aktion
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unsigned long refreshRate = 5000; // Anfangsverzögerung in Millisekunden
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unsigned long messageDisplayTime = 0; // Zeitstempel für die 5-Sekunden-Anzeige
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bool isMessageDisplayed = false; // Zustand, ob die Aktualisierungsrate angezeigt wird
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int currentDelayIndex = 0; // Aktueller Index im Delay-Array
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const unsigned long delayOptions[] = {5000, 10000, 15000, 20000, 30000, 45000, 60000, 1000, 2000};
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const int delayOptionsSize = sizeof(delayOptions) / sizeof(delayOptions[0]);
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int lastButtonState = HIGH; // Letzter Zustand des Buttons
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int currentButtonState;
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String netzbezug;
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String netzbezug_alt;
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String erzeugung;
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String erzeugung_alt;
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// LCD initialisieren (16x2 Display)
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LiquidCrystal_I2C lcd(0x27, 16, 2);
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int numNetworks = sizeof(ssidList) / sizeof(ssidList[0]);
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int current_ap = 0; // Start mit der ersten SSID
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bool reconnecting = false; // Flag für den Reconnect-Status
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// WLAN Symbol
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byte customChar_wlan[] = {
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B00000,
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B01110,
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B10001,
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B00100,
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B01010,
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B00000,
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B00100,
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B00000
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};
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// Funktion zum Anzeigen von Text auf einem 1602 LCD Display
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//
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// _lcd_display_text(TEXT, ROW, RETURNTOSTART, ALIGNMENT)
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//
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// row = 0 Zeile 0 wir beschrieben [default]
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// = 1 Zeile 1 wir beschrieben [default]
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// text = Der anzuzeigende Text (default löscht die komplette Zeile)
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// alignment = left Text Ausrichtung links (Bei <= 16 Zeichen) [default]
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// = center Text Ausrichtung zentriert (Bei <= 16 Zeichen)
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// = right Text Ausrichtung links (Bei <= 16 Zeichen)
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// returnToStart = false Zu langer Text der durchgescrollt wird stoppt am Ende [default]
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// true Zu langer Text der durchgescrollt wird springt zum 1. Buchstaben zurück
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void _lcd_display_text(int row = 0, const char* text = " ", const char* alignment = "left", bool returnToStart = false) {
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// Textlänge ermitteln
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int textLength = strlen(text);
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// Sicherstellen, dass die Zeile gültig ist (0 oder 1)
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if (row < 0 || row > 1) {
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return;
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}
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lcd.setCursor(0, row);
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// Wenn der Text <= 16 Zeichen ist, ausrichten
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if (textLength <= 16) {
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int padding = 0;
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if (strcmp(alignment, "center") == 0) {
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padding = (16 - textLength) / 2; // Zentriert
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} else if (strcmp(alignment, "right") == 0) {
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padding = 16 - textLength; // Rechtsbündig
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}
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//lcd.clear();
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lcd.setCursor(0, row);
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// Leerzeichen vor dem Text für Ausrichtung
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for (int i = 0; i < padding; i++) {
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lcd.print(" ");
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}
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// Text ausgeben
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lcd.print(text);
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} else {
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// Wenn der Text > 16 Zeichen ist, zuerst die ersten 16 Zeichen anzeigen
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lcd.setCursor(0, row);
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lcd.print(text);
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delay(2000); // Kurze Pause, damit der Anfang lesbar ist
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// Danach scrollen
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for (int i = 1; i <= textLength - 16; i++) {
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lcd.setCursor(0, row);
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lcd.print(text + i); // Ab Offset i den Text anzeigen
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delay(300); // Verzögerung für Scroll-Geschwindigkeit
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}
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// Verhalten nach dem Scrollen festlegen
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if (returnToStart) {
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lcd.setCursor(0, row);
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lcd.print(text); // Anfang des Textes wieder anzeigen
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} else {
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lcd.setCursor(0, row);
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lcd.print(text + (textLength - 16)); // Text hinten stehen lassen
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}
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}
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}
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// Funktion zum Extrahieren eines Wertes aus der GET-Anfrage von Tasmota-Geräten
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String _extract_value_tasmota_json(const String& url, const String& key) {
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WiFiClient client; // WiFiClient-Objekt erstellen
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HTTPClient http;
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if (http.begin(client, url)) { // Begin mit WiFiClient und URL
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int httpResponseCode = http.GET();
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if (httpResponseCode == 200) {
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String response = http.getString();
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http.end();
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int startIndex = response.indexOf("\"" + key + "\":");
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if (startIndex == -1) {
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return "?"; // Key nicht gefunden
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}
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startIndex += key.length() + 3;
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int endIndex = response.indexOf(",", startIndex);
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if (endIndex == -1) {
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endIndex = response.indexOf("}", startIndex);
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}
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if (endIndex == -1) {
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return "?";
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}
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String value = response.substring(startIndex, endIndex);
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value.trim();
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return String((int)value.toFloat()); // Nachkommastellen abschneiden
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} else {
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//Serial.println("Fehler bei der Anfrage: " + String(httpResponseCode));
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}
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http.end();
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} else {
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Serial.println("Verbindung zur URL fehlgeschlagen: " + url);
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}
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return "?";
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}
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// WLAN-Verbindung herstellen
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void connectToWiFi() {
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Serial.println("WLAN Verbindungsaufbau zu: " + String(ssidList[current_ap]));
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Serial.println("Passwort: " + String(passwordList[current_ap]));
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_lcd_display_text(0, "Bitte warten", "center");
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_lcd_display_text(1, "WLAN verbinden ", "left");
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lcd.createChar(0, customChar_wlan);
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lcd.setCursor(15, 1);
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lcd.write(byte(0));
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WiFi.begin(ssidList[current_ap], passwordList[current_ap]);
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//Blinkendes WLAN Symbol wärend das WLAN versucht zu verbinden
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int attempt = 0;
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while (WiFi.status() != WL_CONNECTED && attempt < 10) {
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delay(500);
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Serial.print(".");
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lcd.setCursor(15, 1);
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lcd.print(" ");
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delay(500);
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lcd.setCursor(15, 1);
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lcd.write(byte(0));
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attempt++;
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}
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//Verbindung fehlgeschlagen (current_ap erhöhen)
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if (WiFi.status() != WL_CONNECTED) {
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WiFi.disconnect();
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delay(500);
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Serial.println("\nVerbindung fehlgeschlagen.");
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current_ap = (current_ap + 1) % numNetworks;
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reconnecting = false;
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//Verbunden
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} else {
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Serial.print("\nWLAN verbunden: ");
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Serial.print(WiFi.SSID());
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Serial.print(" ");
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Serial.println(WiFi.RSSI());
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_lcd_display_text(0, "WLAN verbunden", "center");
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_lcd_display_text(1);
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_lcd_display_text(1, WiFi.SSID().c_str());
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reconnecting = false;
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delay(2500);
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_lcd_display_text(0, "Netzbezug: ?W");
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_lcd_display_text(1, "Erzeugung: ?W");
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}
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}
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void update_power_values() {
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Serial.print("SmartMeterReader auslesen: ");
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netzbezug = _extract_value_tasmota_json("http://" + ip_netzbezug + "/cm?cmnd=Status%208", "Power");
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Serial.print(netzbezug + "W\n");
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Serial.print("Zwischenstecker auslesen : ");
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erzeugung = _extract_value_tasmota_json("http://" + ip_erzeugung + "/cm?cmnd=Status%208", "Power");
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Serial.print(erzeugung + "W\n");
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if (netzbezug != netzbezug_alt) {
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lcd.setCursor(10, 0);
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lcd.print(" ");
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lcd.setCursor(16 - (netzbezug.length() + 1), 0);
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lcd.print(netzbezug);
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}
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if (erzeugung != erzeugung_alt) {
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lcd.setCursor(10, 1);
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lcd.print(" ");
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lcd.setCursor(16 - (erzeugung.length() + 1), 1);
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lcd.print(erzeugung);
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}
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netzbezug_alt = netzbezug;
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erzeugung_alt = erzeugung;
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}
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void handleButtonPress() {
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currentButtonState = digitalRead(BUTTON_PIN);
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if (currentButtonState == LOW && lastButtonState == HIGH) {
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currentDelayIndex = (currentDelayIndex + 1) % delayOptionsSize;
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refreshRate = delayOptions[currentDelayIndex];
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Serial.print("Neue Aktualisierungsrate: ");
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Serial.println(refreshRate);
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_lcd_display_text(0, " Aktual. Rate ");
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_lcd_display_text(1);
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_lcd_display_text(1, (String(refreshRate / 1000) + " Sekunden").c_str(), "center");
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isMessageDisplayed = true;
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messageDisplayTime = millis();
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delay(200);
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}
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lastButtonState = currentButtonState;
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}
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void setup() {
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pinMode(BUTTON_PIN, INPUT_PULLUP);
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Serial.begin(115200);
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delay(1000);
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lcd.init();
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lcd.backlight();
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lcd.createChar(0, customChar_wlan);
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WiFi.setHostname(hostname);
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WiFi.mode(WIFI_STA);
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lcd.setCursor(0, 0);
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_lcd_display_text(0, "Bereit", "center");
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}
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void loop() {
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handleButtonPress();
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if (WiFi.status() != WL_CONNECTED && !reconnecting) {
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reconnecting = true;
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connectToWiFi();
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}
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if (isMessageDisplayed && millis() - messageDisplayTime >= 2500) {
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isMessageDisplayed = false;
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_lcd_display_text(0, "Netzbezug: ?W");
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_lcd_display_text(1, "Erzeugung: ?W");
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update_power_values();
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}
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if (WiFi.status() == WL_CONNECTED && !reconnecting) {
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if (!isMessageDisplayed && millis() - lastUpdateTime >= refreshRate) {
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lastUpdateTime = millis();
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update_power_values();
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}
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}
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}
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