diff --git a/INA226.zip b/INA226.zip
new file mode 100644
index 0000000..3f26b76
Binary files /dev/null and b/INA226.zip differ
diff --git a/README.md b/README.md
index 89bb553..712d9da 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,117 @@
-# ESP32_powerMC
 
+# Webserver und URLs
+
+Der Webserver ist auf dem ESP32 implementiert und bietet verschiedene Endpunkte für die Bedienung und Anzeige von Informationen. Hier sind die definierten URLs und ihre Funktionen:
+
+- **Root Path ("/")**
+  - HTTP-Methode: GET
+  - Zeigt die Hauptseite mit allgemeinen Informationen an, einschließlich Links zu anderen Endpunkten.
+
+- **JSON Path ("/json")**
+  - HTTP-Methode: GET
+  - Liefert JSON-formatierte Daten mit Informationen über Busspannung, Strom, Leistung, Energie, Temperatur, Luftfeuchtigkeit und Fehlercode.
+
+Beispiel:
+```
+{
+  "busVoltage": 25.6,
+  "shuntVoltage": 0.0, 
+  "current": 10.5,
+  "power": 268.8,
+  "energy": 134.4,
+  "temp": 28.5,
+  "humidity": 45.8,
+  "errorCode
+}
+```
+
+- **Config Path ("/config")**
+  - HTTP-Methode: GET
+  - Zeigt eine Konfigurationsseite an, auf der Benutzer Einstellungen für Temperatur, Luftfeuchtigkeit und Strombereiche ändern können.
+
+- **Save Config Path ("/saveConfig")**
+  - HTTP-Methode: PUT
+  - Behandelt die Anforderung zum Speichern der neuen Konfigurationsdaten, die durch die Konfigurationsseite festgelegt wurden.
+
+Beispiel:
+```
+{
+  "temp_min": 20.0,
+  "temp_max": 30.0,
+  "humi_min": 40.0,
+  "humi_max": 60.0,
+  "current_min": -5.0,
+  "current_max": 5.0
+}
+```
+
+- **Demo Mode 1 Path ("/demo1")**
+  - HTTP-Methode: GET
+  - Startet den Demo-Modus 1: Demonstriert einen lade-/entladezyklus ab der Hälfte der maximalen Kapazität mit variablem Strom bei 25,6A.
+
+- **Demo Mode 2 Path ("/demo2")**
+  - HTTP-Methode: GET
+  - Startet den Demo-Modus 2: Demonstriert einen ladezyklus ab 97% der maximalen Kapazität auf 100% mit 200A bei 25.6V.
+
+- **Demo Mode 3 Path ("/demo3")**
+  - HTTP-Methode: GET
+  - Startet den Demo-Modus 3: Demonstriert einen entladezyklus ab 3% der maximalen Kapazität auf 0% mit -200A bei 25.6V.
+
+Die HTML-Seiten werden dynamisch generiert und enthalten JavaScript für die Aktualisierung von Daten über AJAX-Anfragen. Die Konfigurationsseite ermöglicht es Benutzern, bestimmte Parameter über Schieberegler einzustellen und Änderungen zu speichern.
+
+# Fehlermeldungen für den wert `errorCode`
+
+Die Variable `globalError` wird als Bitmask verwendet, wobei jedes Bit eine bestimmte Fehlerbedingung repräsentiert. Hier sind die möglichen Fehlermeldungen und ihre Bedeutungen:
+
+## `ERROR_NONE` (0b0000000000000000)
+
+Kein Fehler. Das Gerät funktioniert ordnungsgemäß, es liegen keine Fehler vor.
+
+## `ERROR_MAX_CURRENT_EXCEEDED` (0b0000000000000001)
+
+Der maximale Stromverbrauch wurde überschritten. Möglicherweise liegt eine Überlastung des Geräts vor.
+
+## `ERROR_CURRENT_BELOW_MIN` (0b0000000000000010)
+
+Der aktuelle Stromverbrauch liegt unter dem zulässigen Minimum. Möglicherweise gibt es ein Problem mit der Stromzufuhr.
+
+## `ERROR_MAX_TEMP_EXCEEDED` (0b0000000000000100)
+
+Die maximale Temperatur wurde überschritten. Das Gerät könnte überhitzen.
+
+## `ERROR_TEMP_BELOW_MIN` (0b0000000000001000)
+
+Die Temperatur liegt unterhalb des zulässigen Minimums. Es besteht die Gefahr von Unterkühlung oder anderen temperaturbedingten Problemen.
+
+## `ERROR_MAX_HUMI_EXCEEDED` (0b0000000000010000)
+
+Die maximale Luftfeuchtigkeit wurde überschritten. Dies könnte zu feuchtigkeitsbedingten Problemen führen.
+
+## `ERROR_HUMI_BELOW_MIN` (0b0000000000100000)
+
+Die Luftfeuchtigkeit liegt unter dem zulässigen Minimum. Es besteht die Gefahr von zu geringer Luftfeuchtigkeit.
+
+Bitte beachten Sie, dass mehrere Fehler gleichzeitig auftreten können, da die Bitmasken kombiniert werden können. Zum Beispiel könnte `ERROR_MAX_TEMP_EXCEEDED | ERROR_MAX_HUMI_EXCEEDED` darauf hinweisen, dass sowohl die maximale Temperatur als auch die maximale Luftfeuchtigkeit überschritten wurden.
+
+# Used libraries (Arduino)
+
+WiFi at version 2.0.0
+ESP32httpUpdate at version 2.1.145
+HTTPClient at version 2.0.0
+WiFiClientSecure at version 2.0.0
+Update at version 2.0.0
+FS at version 2.0.0
+SPIFFS at version 2.0.0
+WebServer at version 2.0.0
+ArduinoJson at version 7.0.2
+WiFiManager at version 2.0.16-rc.2
+DNSServer at version 2.0.0
+EEPROM at version 2.0.0
+Wire at version 2.0.0
+INA226 at version 0.5.2
+Adafruit GFX Library at version 1.11.9
+Adafruit BusIO at version 1.15.0
+SPI at version 2.0.0
+Adafruit SSD1306 at version 2.5.9
+Adafruit Unified Sensor at version 1.1.14
+Adafruit BME280 Library at version 2.2.4
diff --git a/firmware/config_user.h b/firmware/config_user.h
new file mode 100644
index 0000000..d546e79
--- /dev/null
+++ b/firmware/config_user.h
@@ -0,0 +1,44 @@
+
+#define FIRMWARE_VERSION "v0.3.0"
+
+//#define DEBUG_NO_I2C
+#define DEBUG_NO_SERIAL_MSG
+
+#define WATCHDOG_TIMEOUT_S 5
+
+#define INA226_I2C_ADDRESS 0x41
+#define BME280_I2C_ADDRESS 0x76 // oder 0x77, je nach Verbindung des ADDR-Pins
+#define OLED_I2C_ADDRESS   0x3C // -> the addresses like 0x78 which is selected on the chip is not correct
+
+#define LOOP_INA226READ_DEMO_DELAY_MS  1000
+#define LOOP_DISPLAY_DELAY_MS          5000 // 5 Sekunden
+#define LOOP_DISPLAY_DEMO_DELAY_MS     1000
+#define LOOP_HANDLE_CLIENT_DELAY_MS     250
+#define LOOP_INA226CHECK_DELAY_MS    600000
+#define LOOP_WLAN_CHECK_DELAY_MS      60000
+
+#define OLED_SCREEN_WIDTH   128 // OLED display width, in pixels
+#define OLED_SCREEN_HEIGHT   64 // OLED display height, in pixels
+#define OLED_RESET_PIN       -1 // Reset pin # (or -1 if sharing Arduino reset pin)
+#define OLED_TEST_SIZE        2
+
+#define DISPLAY_SWITCH_SHOWN_VALUE_COUNT 2
+
+// default config values
+#define DEFAULT_SHUNT_VOLTAGE_DROP     85.0 // mV
+#define DEFAULT_SHUNT_CURRENT_MAX     100.0 // A
+#define DEFAULT_TEMP_MIN               20.0 // °C environment
+#define DEFAULT_TEMP_MAX               30.0 // °C environment
+#define DEFAULT_HUMI_MIN               30.0 // % humidity
+#define DEFAULT_HUMI_MAX               70.0 // % humidity
+#define DEFAULT_CURRENT_MIN          -100.0 // maximum continuous discharge current
+#define DEFAULT_CURRENT_MAX           100.0 // maximum continuous discharge current
+#define DEFAULT_MAX_CAPACITY        2500.0f
+#define DEFAULT_INA226READ_DELAY_S       30 // 30 Sekunden default, overwritten by eeprom config
+
+#define EEPROM_SIZE         100 // in byte
+// EEPROM-Adresse, an der die globale Energiemenge gespeichert wird
+#define EEPROM_ADDR_ENERGY    0
+#define EEPROM_ADDR_CFG_START 8 // sizeof(struct EnergyData { float energy; uint16_t checksum; };
+
+#define FIRMWARE_UPDATE_URL "http://192.168.0.142:8082/firmware.ino.bin"
diff --git a/firmware/constants.h b/firmware/constants.h
new file mode 100644
index 0000000..9d0472b
--- /dev/null
+++ b/firmware/constants.h
@@ -0,0 +1,88 @@
+
+const String cs_configFile = "config_user.h";
+const String cs_configPortalSSID = "powerMC_Config";
+const String cs_connectionError = "Failed to establish connection, and timeout for the configuration portal expired. Restart.";
+const String cs_connectedToWiFi = "Connected to WiFi";
+const String cs_ssd1306Init = "SSD1306 display init";
+const String cs_ssd1306NotFound = "SSD1306 display not found. Restart.";
+const String cs_ina226Init = "INA226 sensor init";
+const String cs_ina226ChipNotFound = "INA226 chip not found. Restart.";
+const String cs_bme280Init = "BME280 sensor init";
+const String cs_bme280NotFound = "Could not find BME280. Restart.";
+const String cs_webserverInit = "Webserver init";
+const String cs_rootPath = "/";
+const String cs_jsonPath = "/json";
+const String cs_configPath = "/config";
+const String cs_saveConfigPath = "/saveConfig";
+const String cs_demoMode1Path = "/demo1";
+const String cs_demoMode2Path = "/demo2";
+const String cs_demoMode3Path = "/demo3";
+const String cs_resetESPPath = "/resetESP";
+const String cs_resetWifiPath = "/resetWifi";
+const String cs_checkUpdatePath = "/checkUpdate";
+const String cs_updateFirmwareActionPath = "/updateFirmwareAction";
+const String cs_readUpdateFirmwareStatusPath = "/readUpdateFirmwareStatus";
+const String cs_handleCSSPath = "/css";
+const String cs_enableWatchdog = "Enable the WatchDog";
+const String cs_readCapacityFromEEPROM = "Read available capacity from EEPROM";
+const String cs_readConfigFromEEPROM = "Read config from EEPROM";
+const String cs_initializationComplete = "Initialization completed";
+const String cs_separatorLine = "----------";
+const String cs_busVoltageLabel = "Bus Voltage: ";
+const String cs_shuntVoltageLabel = "Shunt Voltage: ";
+const String cs_currentLabel = "Current: ";
+const String cs_powerLabel = "Power: ";
+const String cs_energyLabel = "Energy: ";
+const String cs_temperatureLabel = "Temperature: ";
+const String cs_humidityLabel = "Humidity: ";
+const String cs_configDataLabel = "Config Data:";
+const String cs_tempMinLabel = "Temp Min: ";
+const String cs_tempMaxLabel = "Temp Max: ";
+const String cs_humiMinLabel = "Humi Min: ";
+const String cs_humiMaxLabel = "Humi Max: ";
+const String cs_currentMinLabel = "Current Min: ";
+const String cs_currentMaxLabel = "Current Max: ";
+const String cs_shuntVoltageDropLabel = "Shunt voltage drop: ";
+const String cs_shuntMaxCurrentLabel = "Shunt max current: ";
+const String cs_timeIna226RefreshLabel = "Ina226 refresh time: ";
+const String cs_checksumLabel = "Checksum: ";
+const String cs_separator2 = "------------------------";
+const String cs_startingFirmwareUpdate = "Starting firmware update ";
+const String cs_finish = "finish";
+const String cs_noUpdatesAvailable = "No Updates available.";
+const String cs_fwUpdSuccess = "Firmware update successful, resetting in a few seconds.";
+const String cs_unknownStatus = "Unknown status.";
+const String cs_fwUpdRunning = "Firmware-Update is running...";
+const String cs_disablingWatchdog = "Disabling watchdog.";
+const String cs_ina226ChipNotFoundRestart = "INA226 chip not found. Restart.";
+const String cs_wifiDisconnectedRestart = "WiFi connection disconnected. Restart.";
+const String cs_textHtml = "text/html";
+const String cs_textCSS = "text/css";
+const String cs_busVoltageID = "busVoltage";
+const String cs_shuntVoltageID = "shuntVoltage";
+const String cs_currentID = "current";
+const String cs_powerID = "power";
+const String cs_energyID = "energy";
+const String cs_tempID = "temp";
+const String cs_humidityID = "humidity";
+const String cs_timeIna226RefreshID = "time_ina226_refresh";
+const String cs_errorCodeID = "errorCode";
+const String cs_applicationJson = "application/json";
+const String cs_ampereUnit = "A";
+const String cs_wattUnit = "W";
+const String cs_wattHourUnit = "Wh";
+const String cs_voltageUnit = "V";
+const String cs_stateOfChargeLabel = "SOC:";
+const String cs_percentageUnit = "%";
+const String cs_savingGlobalEnergyToEEPROM = "Saving global energy to EEPROM";
+const String cs_dataEnergy = "data.energy: ";
+const String cs_dataChecksum = "data.checksum: ";
+const String cs_eepromWriteComplete = "EEPROM write energy complete ";
+const String cs_readChecksum = "Read Checksum: ";
+const String cs_calculatedChecksum = "Calculated Checksum: ";
+const String cs_eepromReadComplete = "EEPROM read energy complete ";
+const String cs_eepromValueDamaged = "EEPROM value for capacity is damaged, returning 0.0";
+const String cs_errorCode = "Error code: 0b";
+const String cs_newChecksum = "New calculated checksum = ";
+const String cs_eepromConfigAfterRead = "After EEPROM read - ";
+const String cs_eepromSetConfigDefault = "EEPROM-Daten beschädigt! Setze auf Standardwerte.";
diff --git a/firmware/data_storage.ino b/firmware/data_storage.ino
new file mode 100644
index 0000000..cad333d
--- /dev/null
+++ b/firmware/data_storage.ino
@@ -0,0 +1,120 @@
+
+void saveGlobalEnergyToEEPROM() {
+
+#ifndef DEBUG_NO_SERIAL_MSG
+  Serial.println(cs_savingGlobalEnergyToEEPROM);
+#endif
+
+  EnergyData data;
+  data.energy = globalEnergy;
+  // Berechnung der Prüfsumme nur über data.energy
+  data.checksum = calculateChecksum(data.energy);
+
+  EEPROM.put(EEPROM_ADDR_ENERGY, data);
+  EEPROM.commit();  // Dauerhaftes Speichern der Änderungen
+  delay(100);
+#ifndef DEBUG_NO_SERIAL_MSG
+  Serial.print(cs_eepromWriteComplete);
+  Serial.println(data.energy);
+#endif
+
+  //readGlobalEnergyFromEEPROM();
+}
+
+// Funktion zum Lesen der Energiemenge aus dem EEPROM
+float readGlobalEnergyFromEEPROM() {
+  EnergyData data;
+  EEPROM.get(EEPROM_ADDR_ENERGY, data);
+
+  /*
+  Serial.print(cs_readChecksum);
+  Serial.println(data.checksum);
+  Serial.print(cs_calculatedChecksum);
+  Serial.println(calculateChecksum(data.energy));
+  */
+
+  // Überprüfen der Prüfsumme nur über data.energy
+  if (data.checksum == calculateChecksum(data.energy)) {
+    // Prüfsumme ist korrekt, geben Sie die Energiemenge zurück
+    Serial.print(cs_eepromReadComplete);
+    Serial.print(data.energy);
+    Serial.println();
+
+    return data.energy;
+
+  } else {
+    // Prüfsumme stimmt nicht überein, möglicherweise ungültige Daten
+    // Hier können Sie eine geeignete Behandlung implementieren, z. B. Standardwert zurückgeben
+    Serial.println(cs_eepromValueDamaged);
+    return 0.0;
+  }
+}
+
+// Funktion zum Berechnen der Prüfsumme über data.energy
+uint16_t calculateChecksum(float energy) {
+  uint16_t checksum = 0;
+  uint8_t *dataPtr = (uint8_t *)&energy;
+
+  for (int i = 0; i < sizeof(float); i++) {
+    checksum ^= dataPtr[i];
+  }
+
+  return checksum;
+}
+
+void writeConfigToEEPROM() {
+  globalConfigData.checksum = calculateChecksumConfig();
+
+  printConfigData(globalConfigData);
+
+  EEPROM.put(EEPROM_ADDR_CFG_START, globalConfigData);
+  EEPROM.commit();
+  delay(100);
+}
+
+void readConfigFromEEPROM() {
+  EEPROM.get(EEPROM_ADDR_CFG_START, globalConfigData);
+
+  Serial.print(cs_eepromConfigAfterRead);
+  printConfigData(globalConfigData);
+  uint16_t checksumEEPROM = globalConfigData.checksum;
+
+  // Überprüfe die Checksumme
+  uint16_t checksum = calculateChecksumConfig();
+
+  if (checksum != checksumEEPROM) {
+    Serial.println(cs_eepromSetConfigDefault);
+    // Setze auf Standardwerte
+    globalConfigData.temp_min            = DEFAULT_TEMP_MIN;
+    globalConfigData.temp_max            = DEFAULT_TEMP_MAX;
+    globalConfigData.humi_min            = DEFAULT_HUMI_MIN;
+    globalConfigData.humi_max            = DEFAULT_HUMI_MAX;
+    globalConfigData.current_min         = DEFAULT_CURRENT_MIN;
+    globalConfigData.current_max         = DEFAULT_CURRENT_MAX;
+    globalConfigData.shunt_voltage_drop  = DEFAULT_SHUNT_VOLTAGE_DROP;
+    globalConfigData.shunt_max_current   = DEFAULT_SHUNT_CURRENT_MAX;
+    globalConfigData.max_capacity        = DEFAULT_MAX_CAPACITY;
+    globalConfigData.time_ina226_refresh = DEFAULT_INA226READ_DELAY_S;
+    globalConfigData.current_fact        = 100.0; // offset 100
+    globalConfigData.checksum            = 0;
+
+    writeConfigToEEPROM();
+  }
+}
+
+uint16_t calculateChecksumConfig()
+{
+  // Berechne die Checksumme
+  uint16_t checksum = 0;
+  byte* dataPointer = (byte*)&globalConfigData;
+  globalConfigData.checksum = 0;
+
+  for (size_t i = 0; i < sizeof(globalConfigData); ++i) {
+    checksum += dataPointer[i];
+  }
+
+  Serial.print(cs_newChecksum);
+  Serial.println(checksum);
+
+  return checksum;
+}
diff --git a/firmware/error.h b/firmware/error.h
new file mode 100644
index 0000000..fc7f377
--- /dev/null
+++ b/firmware/error.h
@@ -0,0 +1,10 @@
+
+#define ERROR_NONE                 0b0000000000000000
+#define ERROR_MAX_CURRENT_EXCEEDED 0b0000000000000001
+#define ERROR_CURRENT_BELOW_MIN    0b0000000000000010
+#define ERROR_MAX_TEMP_EXCEEDED    0b0000000000000100
+#define ERROR_TEMP_BELOW_MIN       0b0000000000001000
+#define ERROR_MAX_HUMI_EXCEEDED    0b0000000000010000
+#define ERROR_HUMI_BELOW_MIN       0b0000000000100000
+#define ERROR_INA226_UNCONFIGURED  0b1000000000000000
+
diff --git a/firmware/firmware.ino b/firmware/firmware.ino
new file mode 100644
index 0000000..32fc834
--- /dev/null
+++ b/firmware/firmware.ino
@@ -0,0 +1,476 @@
+
+// This project is written for aESP32 WROOM-32 module (AZ Delivery ESP32 Dev Kit C v4)
+
+#include <WiFi.h>
+#include <ESP32httpUpdate.h>
+#include <WebServer.h>
+#include <ArduinoJson.h>
+#include <WiFiManager.h>
+#include <esp_task_wdt.h>
+#include <EEPROM.h>
+#include <Wire.h>
+#include <INA226.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+#include <Adafruit_Sensor.h>
+#include <Adafruit_BME280.h>
+#include "error.h"
+#include "config_user.h" // includes preprocessor defines
+#include "constants.h"
+
+#ifndef DEBUG_NO_I2C
+INA226 ina226(INA226_I2C_ADDRESS);
+Adafruit_SSD1306 display(OLED_SCREEN_WIDTH, OLED_SCREEN_HEIGHT, &Wire, OLED_RESET_PIN);
+Adafruit_BME280 bme;
+#endif
+
+// WiFiManager initialisieren
+WiFiManager wifiManager;
+WebServer server(80);
+
+// Struktur für die gespeicherte Energie mit Prüfsumme
+struct EnergyData {
+  float energy;
+  uint16_t checksum;
+};
+
+struct ConfigData {
+  float temp_min;
+  float temp_max;
+  float humi_min;
+  float humi_max;
+  float current_min;
+  float current_max;
+  float shunt_voltage_drop;
+  float shunt_max_current;
+  float max_capacity;
+  float time_ina226_refresh;
+  float current_fact;
+  uint16_t checksum;
+};
+
+// demo modes
+bool demoMode1       = false;
+bool demo1Increasing = false;
+bool demoMode2       = false;
+bool demoMode3       = false;
+
+// Globale Variable für den Anzeigemodus
+bool    displayEnergyVoltageMode          = false;
+uint8_t displayEnergyVoltageModeChangeCnt = 0;
+
+// Globale Variablen für INA226-Werte
+float globalBusVoltage   = 0.0;
+float globalShuntVoltage = 0.0;
+float globalCurrent      = 0.0;
+float globalPower        = 0.0;
+float globalShuntValue   = 0.0;
+// Globale Variable für die Energiemenge in Wattstunden
+float globalEnergy   = 0.0;
+float globalTemp     = 0.0;
+float globalHumidity = 0.0;
+
+// global error code
+uint16_t globalErrorCode = ERROR_NONE;
+
+uint16_t ina226Status = 0x0000;
+
+unsigned long lastINA226CheckTime  = 0;
+unsigned long lastWiFiCheckTime    = 0;
+unsigned long lastHandleClientTime = 0;
+unsigned long lastLoopDisplayTime  = 0;
+
+String updateStatus;
+bool fwUpdate_isRunning = false;
+
+ConfigData globalConfigData;
+
+void setup() {
+  Serial.begin(115200);
+
+  Serial.println(cs_readCapacityFromEEPROM);
+  EEPROM.begin(EEPROM_SIZE);
+  // Versuche, die gespeicherte Energiemenge aus dem EEPROM zu laden
+  globalEnergy = readGlobalEnergyFromEEPROM();
+
+  Serial.println(cs_readConfigFromEEPROM);
+  readConfigFromEEPROM();
+  printConfigData(globalConfigData);
+
+  // Timeout für die Konfiguration auf 120s setzen
+  wifiManager.setConfigPortalTimeout(120);
+
+  // Versuche, eine Verbindung herzustellen, und wenn nicht erfolgreich, starte den Konfigurationsportal
+  if (!wifiManager.autoConnect(cs_configPortalSSID.c_str())) {
+    Serial.println(cs_connectionError);
+    delay(10000);
+    // Resete und versuche es erneut
+    ESP.restart();
+  }
+
+  Serial.println(cs_connectedToWiFi);
+
+  // Initialisiere die I2C-Kommunikation
+  Wire.begin();
+
+#ifndef DEBUG_NO_I2C
+  Serial.println(cs_ssd1306Init);
+  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
+  if(!display.begin(SSD1306_SWITCHCAPVCC, OLED_I2C_ADDRESS)) {
+    Serial.println(cs_ssd1306NotFound);
+    delay(10000); // Warte 10 Sekunden
+    ESP.restart(); // Neu starten
+  }
+  // Clear the buffer
+  display.clearDisplay();
+
+  Serial.println(cs_ina226Init);
+  if (!ina226.begin()) {
+    Serial.println(cs_ina226ChipNotFound);
+    delay(10000); // Warte 10 Sekunden
+    ESP.restart(); // Neu starten
+  }
+
+  configureIna226();
+
+  Serial.println(cs_bme280Init);
+  if (!bme.begin(BME280_I2C_ADDRESS)) {
+    Serial.println(cs_bme280NotFound);
+    delay(10000); // Warte 10 Sekunden
+    ESP.restart(); // Neu starten
+  }
+#endif // no sensor debug
+
+  Serial.println(cs_webserverInit);
+  server.on(cs_rootPath,                     HTTP_GET, handleRoot);
+  server.on(cs_jsonPath,                     HTTP_GET, handleJson);
+  server.on(cs_configPath,                   HTTP_GET, handleConfig);
+  server.on(cs_saveConfigPath,               HTTP_PUT, handleSaveConfig);
+  server.on(cs_demoMode1Path,                HTTP_GET, handleDemoMode1);
+  server.on(cs_demoMode2Path,                HTTP_GET, handleDemoMode2);
+  server.on(cs_demoMode3Path,                HTTP_GET, handleDemoMode3);
+  server.on(cs_resetESPPath,                 HTTP_GET, handleResetESP);
+  server.on(cs_resetWifiPath,                HTTP_GET, handleResetWifi);
+  server.on(cs_checkUpdatePath,              HTTP_GET, handleUpdateFirmware);
+  server.on(cs_updateFirmwareActionPath,     HTTP_GET, handleUpdateFirmwareAction);
+  server.on(cs_readUpdateFirmwareStatusPath, HTTP_GET, handleReadUpdateFirmwareStatus);
+  server.on(cs_handleCSSPath,                HTTP_GET, handleCSS);
+  server.begin();
+
+  enableWatchdog();
+
+  Serial.println(cs_initializationComplete);
+
+  checkError();
+
+#ifndef DEBUG_NO_I2C
+  //delay(1000);
+  displayData();
+#endif
+}
+
+void loop() {
+  static unsigned long lastLoopTime = 0;
+
+  bool demoMode = (demoMode1 || demoMode2 || demoMode3);
+
+  // Führe den Code nur alle xx Sekunden aus
+  if (millis() - lastLoopTime >= ((demoMode == false) ? (globalConfigData.time_ina226_refresh * 1000) : LOOP_INA226READ_DEMO_DELAY_MS)) {
+    lastLoopTime = millis();
+
+    if (demoMode1 == true)
+    {
+      simulateUpDownSensorValues();
+
+    } else if (demoMode2 == true) {
+      simulateChrgFull();
+
+    } else if (demoMode3 == true) {
+      simulateDischrgEmpty();
+
+    } else {
+#ifndef DEBUG_NO_I2C
+      // INA226-Werte aktualisieren
+      globalBusVoltage   = ina226.getBusVoltage();
+      globalShuntVoltage = ina226.getShuntVoltage();
+      globalCurrent      = ina226.getCurrent() * (globalConfigData.current_fact / 100);
+      globalPower        = ina226.getPower();
+#endif
+    }
+
+#ifndef DEBUG_NO_SERIAL_MSG
+    Serial.println(cs_separatorLine);
+#endif
+
+    // Berechne den Energieverbrauch und aktualisiere die globale Energiemenge
+    updateEnergy(globalCurrent, globalPower);
+
+#ifndef DEBUG_NO_I2C
+    globalTemp     = bme.readTemperature();
+    globalHumidity = bme.readHumidity();
+#endif
+
+    checkError();
+
+#ifndef DEBUG_NO_SERIAL_MSG
+    // Debug-Ausgabe der aktualisierten Werte
+    Serial.print(cs_busVoltageLabel);
+    Serial.println(globalBusVoltage);
+    Serial.print(cs_shuntVoltageLabel);
+    Serial.println(globalShuntVoltage);
+    Serial.print(cs_currentLabel);
+    Serial.println(globalCurrent);
+    Serial.print(cs_powerLabel);
+    Serial.println(globalPower);
+    Serial.print(cs_energyLabel);
+    Serial.println(globalEnergy);
+    Serial.print(cs_temperatureLabel);
+    Serial.println(globalTemp);
+    Serial.print(cs_humidityLabel);
+    Serial.println(globalHumidity);
+#endif
+
+  }
+
+  if (millis() - lastLoopDisplayTime >= ((demoMode == false) ? LOOP_DISPLAY_DELAY_MS : LOOP_DISPLAY_DEMO_DELAY_MS)) {
+    lastLoopDisplayTime = millis();
+    // Display aktualisieren
+#ifndef DEBUG_NO_I2C
+    displayData();
+#endif
+  }
+
+  if (millis() - lastHandleClientTime >= LOOP_HANDLE_CLIENT_DELAY_MS) {
+    lastHandleClientTime = millis();
+    server.handleClient();
+  }
+
+  // Überprüfe, ob es Zeit ist, die Anwesenheit des INA226-Chip erneut zu überprüfen
+  if (millis() - lastINA226CheckTime >= LOOP_INA226CHECK_DELAY_MS) { // 10 Minuten = 600000 Millisekunden
+    lastINA226CheckTime = millis();
+
+#ifndef DEBUG_NO_I2C
+    if (!ina226.begin()) {
+      Serial.println(cs_ina226ChipNotFoundRestart);
+      delay(5000);
+      ESP.restart();
+    }
+#endif
+  }
+
+  // Überprüfe, ob WLAN-Verbindung getrennt wurde
+  if (WiFi.status() == WL_DISCONNECTED && millis() - lastWiFiCheckTime >= LOOP_WLAN_CHECK_DELAY_MS) { // 1 Minute = 60000 Millisekunden
+    lastWiFiCheckTime = millis();
+    Serial.println(cs_wifiDisconnectedRestart);
+    delay(5000);
+    ESP.restart();
+  }
+
+  // Füttere den Watchdog-Timer, um einen Reset zu vermeiden
+  esp_task_wdt_reset();
+
+  // Blockiere die loop() Funktion maximal 100ms
+  delay(100);
+
+}
+
+#ifndef DEBUG_NO_I2C
+void displayData() {
+  display.clearDisplay();
+
+  // Zeige den Stromwert an
+  display.setTextSize(OLED_TEST_SIZE);
+  display.setTextColor(SSD1306_WHITE);
+  display.setCursor(0, 0);
+  display.print(globalCurrent, 2); // Zwei Dezimalstellen anzeigen
+  display.setCursor(100, 0);
+  display.print(cs_ampereUnit);
+
+  // Zeige die Leistung an
+  display.setTextColor(SSD1306_WHITE);
+  display.setCursor(0, 17);
+  display.print(globalPower, 2); // Zwei Dezimalstellen anzeigen
+  display.setCursor(100, 17);
+  display.print(cs_wattUnit);
+
+  //display.setTextSize(1);
+
+  // Zeige den Stromwert oder die Bus-Spannung basierend auf dem Anzeigemodus an
+  if (displayEnergyVoltageMode) {
+    // Zeige die verfügbare Energiemenge an
+    display.setTextSize(OLED_TEST_SIZE);
+    display.setTextColor(SSD1306_WHITE);
+    display.setCursor(0, 34);
+    display.print(globalEnergy, 2); // Zwei Dezimalstellen anzeigen
+    display.setCursor(100, 34);
+    display.print(cs_wattHourUnit);
+  } else {
+    // Zeige die Bus-Spannung an
+    display.setTextSize(OLED_TEST_SIZE);
+    display.setTextColor(SSD1306_WHITE);
+    display.setCursor(0, 34);
+    display.print(globalBusVoltage, 2); // Zwei Dezimalstellen anzeigen
+    display.setCursor(100, 34);
+    display.print(cs_voltageUnit);
+  }
+
+  // Wechsle den Anzeigemodus für das nächste Mal
+  if (displayEnergyVoltageModeChangeCnt >= DISPLAY_SWITCH_SHOWN_VALUE_COUNT)
+  {
+    displayEnergyVoltageMode = !displayEnergyVoltageMode;
+    displayEnergyVoltageModeChangeCnt = 0;
+  } else {
+    displayEnergyVoltageModeChangeCnt++;
+  }
+
+  // Zeige die maximale Kapazität an
+  display.setCursor(0, 51);
+  display.print(cs_stateOfChargeLabel);
+  display.setCursor(50, 51);
+  float batteryCapacityPercentage = (globalEnergy / globalConfigData.max_capacity) * 100.0;
+  batteryCapacityPercentage = max(0.0f, min(batteryCapacityPercentage, 100.0f));
+  display.print(batteryCapacityPercentage, 1); // Zwei Dezimalstellen anzeigen
+  display.setCursor(115, 51);
+  display.print(cs_percentageUnit);
+
+  // Zeige den Pfeil an
+  if (globalCurrent > 0) {
+    display.drawLine(120, 10, 116, 5, SSD1306_WHITE);
+    display.drawLine(120, 10, 124, 5, SSD1306_WHITE);
+  } else if (globalCurrent < 0) {
+    display.drawLine(120, 5, 116, 10, SSD1306_WHITE);
+    display.drawLine(120, 5, 124, 10, SSD1306_WHITE);
+  }
+
+  display.display();
+}
+#endif
+
+void updateEnergy(float current, float power) {
+  static unsigned long lastUpdateTime = 0;
+  static unsigned long lastDailyUpdateCheck = 0;
+
+  // Berechne die vergangene Zeit seit dem letzten Update
+  unsigned long currentTime = millis();
+  float timeInterval = (currentTime - lastUpdateTime) / 1000.0; // Zeitintervall in Sekunden
+
+  // Aktualisiere die globale Energiemenge basierend auf der Leistung und vergangener Zeit
+  float energyChange = (power * timeInterval) / 3600.0; // Energieänderung in Wattstunden
+  if (current > 0)
+  {
+    globalEnergy += energyChange;
+  } else {
+    globalEnergy -= energyChange;
+  }
+
+
+  // Begrenze den Wert auf das Minimum (0) und den maximalen Wert
+  globalEnergy = max(0.0f, min(globalEnergy, globalConfigData.max_capacity));
+
+  if (demoMode1 == false && demoMode2 == false && demoMode3 == false)
+  {
+    // Speichere die globale Energiemenge im EEPROM
+    saveGlobalEnergyToEEPROM();
+  }
+
+  // Aktualisiere die Zeit des letzten Updates
+  lastUpdateTime = currentTime;
+}
+
+void checkError()
+{
+  globalErrorCode = ERROR_NONE;
+
+  if (globalTemp >= globalConfigData.temp_max) {
+    globalErrorCode |= ERROR_MAX_TEMP_EXCEEDED;
+  } else if (globalTemp <= globalConfigData.temp_min) {
+    globalErrorCode |= ERROR_TEMP_BELOW_MIN;
+  }
+  if (globalCurrent > globalConfigData.current_max) {
+    globalErrorCode |= ERROR_MAX_CURRENT_EXCEEDED;
+  } else if (globalCurrent < globalConfigData.current_min) {
+    globalErrorCode |= ERROR_CURRENT_BELOW_MIN;
+  }
+  if (globalHumidity >= globalConfigData.humi_max) {
+    globalErrorCode |= ERROR_MAX_HUMI_EXCEEDED;
+  } else if (globalHumidity <= globalConfigData.humi_min) {
+    globalErrorCode |= ERROR_HUMI_BELOW_MIN;
+  }
+  if (ina226.isCalibrated() == false)
+  {
+    globalErrorCode |= ERROR_INA226_UNCONFIGURED;
+  }
+
+#ifndef DEBUG_NO_SERIAL_MSG
+  Serial.print(cs_errorCode);
+  for (int i = 15; i >= 0; i--) {
+    Serial.print((globalErrorCode >> i) & 1);
+  }
+  Serial.println();
+#endif
+}
+
+
+void printConfigData(ConfigData c) {
+#ifndef DEBUG_NO_SERIAL_MSG
+  Serial.println(cs_configDataLabel);
+  Serial.print(cs_tempMinLabel);
+  Serial.println(c.temp_min);
+  Serial.print(cs_tempMaxLabel;
+  Serial.println(c.temp_max);
+  Serial.print(cs_humiMinLabel);
+  Serial.println(c.humi_min);
+  Serial.print(cs_humiMaxLabel);
+  Serial.println(c.humi_max);
+  Serial.print(cs_currentMinLabel);
+  Serial.println(c.current_min);
+  Serial.print(cs_currentMaxLabel);
+  Serial.println(c.current_max);
+  Serial.print(cs_shuntVoltageDropLabel);
+  Serial.println(c.shunt_voltage_drop);
+  Serial.print(cs_shuntMaxCurrentLabel);
+  Serial.println(c.shunt_max_current);
+  Serial.print(cs_timeIna226RefreshLabel);
+  Serial.println(c.time_ina226_refresh);
+  Serial.print(cs_checksumLabel);
+  Serial.println(c.checksum);
+  Serial.println(cs_separator2);
+#endif
+}
+
+void enableWatchdog()
+{
+  Serial.println(cs_enableWatchdog);
+  // Initialisiere den Watchdog-Timer mit einer Timeout-Zeit von 5 Sekunden
+  esp_task_wdt_init(WATCHDOG_TIMEOUT_S, true);
+  // Aktiviere den Watchdog-Timer für den Hauptprozess
+  esp_task_wdt_add(NULL);
+}
+
+void disableWatchdog()
+{
+    Serial.println(cs_disablingWatchdog);
+    esp_task_wdt_deinit();
+    esp_task_wdt_delete(NULL);
+}
+
+void configureIna226()
+{
+  ina226.setMinimalShunt(0.0001); // overwrite INA226_ERR_SHUNT_LOW
+
+  globalShuntValue = (globalConfigData.shunt_voltage_drop / 1000.0) / globalConfigData.shunt_max_current;
+  Serial.println("Ina226 target shunt size (Ohm): " + String(globalShuntValue));
+
+  // normalization to 3 floatingpoint accuracy
+  ina226Status = ina226.setMaxCurrentShunt(globalConfigData.shunt_max_current / 1000.0,
+                                           globalShuntValue, true);
+  if (0x0000 != ina226Status)
+  {
+    Serial.print("Ina226 error, invalid configuration: ");
+    Serial.println(ina226Status, HEX);
+  }
+  ina226.setAverage(2); // 2=16 samples will be used to build an average value
+  Serial.println("Ina226 mode: "+String(ina226.getMode()));
+  Serial.println("Ina226 shunt ohm: "+String(ina226.getShunt()));
+  Serial.println("Ina226 is calibrated: "+String(ina226.isCalibrated()));
+}
diff --git a/firmware/simulation_demo.ino b/firmware/simulation_demo.ino
new file mode 100644
index 0000000..d4cb685
--- /dev/null
+++ b/firmware/simulation_demo.ino
@@ -0,0 +1,89 @@
+
+void simulateUpDownSensorValues() {
+
+  if (demo1Increasing == false) {
+    globalCurrent      -= 5.0;
+    globalPower         = 25.6 * globalCurrent;
+
+    // Überprüfe, ob die maximalen Werte erreicht sind
+    if (globalCurrent < -100.0) {
+      demo1Increasing = true;
+      globalCurrent = 0;
+    }
+  } else if (demo1Increasing == true) {
+    globalCurrent      += 5.0;
+    globalPower         = 25.6 * globalCurrent;
+
+  }
+
+  // Überprüfe, ob die maximalen Werte erreicht sind
+  if (globalCurrent > 100.0) {
+    // Setze Werte auf 0 zurück
+    globalCurrent      = 0.0;
+    globalPower        = 0.0;
+    globalBusVoltage   = 0.0;
+    globalEnergy       = 0.0;
+
+    demoMode1       = false;
+    demo1Increasing = false;
+  }
+
+}
+
+void simulateChrgFull() {
+  static unsigned long startTime = 0;
+
+  // Startzeit initialisieren, wenn es der erste Durchlauf ist
+  if (startTime == 0) {
+    startTime = millis();
+  }
+
+  globalCurrent = 200.0;
+  globalPower = 25.6 * globalCurrent;
+
+  // Zeitdauer seit dem Start berechnen
+  unsigned long currentTime = millis();
+  unsigned long elapsedTime = currentTime - startTime;
+
+  // Überprüfe, ob die Zeit von 60 Sekunden abgelaufen ist
+  if (elapsedTime >= 60000) {
+    // Setze Werte auf 0 zurück
+    globalCurrent    = 0.0;
+    globalPower      = 0.0;
+    globalBusVoltage = 0.0;
+    globalEnergy     = 0.0;
+
+    // Setze Flags zurück
+    demoMode2 = false;
+    startTime = 0; // Zurücksetzen der Startzeit für den nächsten Durchlauf
+  }
+}
+
+void simulateDischrgEmpty() {
+  static unsigned long startTime = 0;
+
+  // Startzeit initialisieren, wenn es der erste Durchlauf ist
+  if (startTime == 0) {
+    startTime = millis();
+  }
+
+  globalCurrent = -200.0;
+  globalPower = 25.6 * globalCurrent;
+
+  // Zeitdauer seit dem Start berechnen
+  unsigned long currentTime = millis();
+  unsigned long elapsedTime = currentTime - startTime;
+
+  // Überprüfe, ob die Zeit von 60 Sekunden abgelaufen ist
+  if (elapsedTime >= 60000) {
+    // Setze Werte auf 0 zurück
+    globalCurrent    = 0.0;
+    globalPower      = 0.0;
+    globalBusVoltage = 0.0;
+    globalEnergy     = 0.0;
+
+    // Setze Flags zurück
+    demoMode3 = false;
+    startTime = 0; // Zurücksetzen der Startzeit für den nächsten Durchlauf
+  }
+}
diff --git a/firmware/start_webserver.sh b/firmware/start_webserver.sh
new file mode 100755
index 0000000..00851d6
--- /dev/null
+++ b/firmware/start_webserver.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+cd build/esp32.esp32.esp32da && python3 -m http.server 8082 
+cd -
+
diff --git a/firmware/webserver.ino b/firmware/webserver.ino
new file mode 100644
index 0000000..c136224
--- /dev/null
+++ b/firmware/webserver.ino
@@ -0,0 +1,565 @@
+
+void handleRoot() {
+  String html = "<html><head><script src='https://code.jquery.com/jquery-3.6.4.min.js'></script>";
+  html += "<link rel=\"stylesheet\" type=\"text/css\" href=\"/css\">";
+  html += "<link rel='stylesheet' href='https://unpkg.com/purecss@0.6.2/build/pure-min.css'>";
+  html += "<title>powerMC (ESP32) "+String(FIRMWARE_VERSION)+"</title></head>";
+  html += "<body><h1>powerMC (ESP32) "+String(FIRMWARE_VERSION)+"</h1>";
+
+  html += "<table><tr><td>";
+
+  html += "<p><a href='"+cs_jsonPath+"'>JSON Daten</a></p><br>";
+  html += "<p><a href='"+cs_demoMode1Path+"'>Start demo mode charge and discharge</a></p>";
+  html += "<p><a href='"+cs_demoMode2Path+"'>Start demo mode charge to max</a></p>";
+  html += "<p><a href='"+cs_demoMode3Path+"'>Start demo mode discharge to zero</a></p><br>";
+  html += "<p><a href='"+cs_resetESPPath+"'>Reset ESP32</a></p>";
+  html += "<p><a href='"+cs_resetWifiPath+"'>Reset Wifi settings</a></p><br>";
+  html += "<p><a href='"+cs_checkUpdatePath+"'>Firmware update</a></p><br>";
+  html += "<p><a href='"+cs_configPath+"'>Config</a></p>";
+
+  html += "</td><td>&nbsp;</td><td>";
+
+  html += "<p id='busVoltage'>Busvoltage: <span id='busVoltageValue'>0</span> V</p>";
+  html += "<p id='shuntVoltage'>Shuntvoltage: <span id='shuntVoltageValue'>0</span> V</p>";
+  html += "<p id='current'>Strom: <span id='currentValue'>0</span> A</p>";
+  html += "<p id='power'>Leistung: <span id='powerValue'>0</span> W</p>";
+  html += "<p id='energy'>Energie: <span id='energyValue'>0</span> Wh</p>";
+  html += "<p id='temp'>Temp: <span id='tempValue'>0</span> &deg;C</p>";
+  html += "<p id='humidity'>Humidity: <span id='humidityValue'>0</span> %</p>";
+  html += "<p>Shunt max voltage drop: <span>"+String(globalConfigData.shunt_voltage_drop,0)+"</span> mV</p>";
+  html += "<p>Shunt max current: <span>"+String(globalConfigData.shunt_max_current,0)+"</span> A</p>";
+  html += "<p>Current factor: <span>"+String(globalConfigData.current_fact/100,2)+" (div. by 100)</span></p>";
+  html += "<p>Max capacity: <span>"+String(globalConfigData.max_capacity,0)+"</span> Wh</p>";
+  html += "<p>Ina226 refresh period: <span>"+String(globalConfigData.time_ina226_refresh,0)+"</span> s</p>";
+  html += "<p id='errorCode'>Error code: <span id='error'>0</span></p>";
+
+  html += "</td></tr></table>";
+
+  html += "<script>";
+
+  html += "function showNotification(message, isSuccess) {";
+  html += "    var notification = document.createElement('div');";
+  html += "    notification.className = isSuccess ? 'success-notification' : 'error-notification';";
+  html += "    notification.innerHTML = message;";
+  html += "    document.body.appendChild(notification);";
+  html += "    setTimeout(function() {";
+  html += "        document.body.removeChild(notification);";
+  html += "    }, 3000);";
+  html += "}";
+
+  html += "function updateValues() {";
+  html += "$.ajax({";
+  html += "url: '/json',";
+  html += "type: 'GET',";
+  html += "dataType: 'json',";
+  html += "success: function(data) {";
+  html += "$('#currentValue').text(data.current);";
+  html += "$('#powerValue').text(data.power);";
+  html += "$('#energyValue').text(data.energy);";
+  html += "$('#busVoltageValue').text(data.busVoltage);";
+  html += "$('#shuntVoltageValue').text(data.shuntVoltage);";
+  html += "$('#tempValue').text(data.temp.toFixed(2));";
+  html += "$('#humidityValue').text(data.humidity.toFixed(2));";
+  html += "$('#error').text('0b' + data.errorCode.toString(2).padStart(16, '0'));"; // Hier wird der errorCode als Binärzahl dargestellt
+  html += "},";
+  html += "error: function() {";
+  html += "console.log('Fehler beim Abrufen der Daten.');";
+  html += "}";
+  html += "});";
+  html += "}";
+  html += "updateValues();";
+  html += "setInterval(updateValues, " + String(LOOP_DISPLAY_DELAY_MS) + ");";
+  html += "</script></body></html>";
+
+  server.send(200, cs_textHtml, html);
+}
+
+void handleJson() {
+  // JSON-Daten aus globalen Variablen erstellen
+  DynamicJsonDocument doc(200);
+  doc[cs_busVoltageID]    = globalBusVoltage;
+  doc[cs_shuntVoltageID]  = globalShuntVoltage;
+  doc[cs_currentID]       = globalCurrent;
+  doc[cs_powerID]         = globalPower;
+  doc[cs_energyID]        = globalEnergy;
+  doc[cs_tempID]          = globalTemp;
+  doc[cs_humidityID]      = globalHumidity;
+  doc[cs_errorCodeID]     = globalErrorCode;
+  doc["shuntValue"]       = globalShuntValue;
+  doc["ina226Status"]     = ina226Status;
+  doc["ina226ShuntValue"] = ina226.getShunt();
+  doc["ina226AlertFlag"]  = ina226.getAlertFlag();
+  doc["ina226AlertLimit"] = ina226.getAlertLimit();
+  doc["ina226CurrentLSB"] = ina226.getCurrentLSB();
+
+  String jsonData;
+  serializeJson(doc, jsonData);
+
+  server.send(200, cs_applicationJson, jsonData);
+}
+
+void handleConfig() {
+  String html = "<html><head>";
+    html += "<title>powerMC (ESP32) "+String(FIRMWARE_VERSION)+" - configuration</title>";
+    html += "<link rel=\"stylesheet\" type=\"text/css\" href=\"/css\">";
+    html += "<link rel='stylesheet' href='https://unpkg.com/purecss@0.6.2/build/pure-min.css'>";
+    html += "</head>";
+
+    html += "<body><h1>powerMC (ESP32) "+String(FIRMWARE_VERSION)+" - configuration</h1>";
+
+    html += "<p><a href='"+cs_rootPath+"'>Main</a></p><br>";
+
+    html += "<form id=\"configForm\" action=\"/saveConfig\" method=\"post\">";
+
+    html += "<table>";
+
+    html += "<tr><td><label for=\"temp_min\">Max capacity:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"max_capacity\" name=\"max_capacity\" value=\"" + String(globalConfigData.max_capacity) + "\" min=\"2000\" max=\"10000\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"max_capacity_value\">" + String(globalConfigData.max_capacity, 0) + "</span>Wh</td></tr>";
+
+    html += "<tr><td><label for=\"temp_min\">Shunt voltage drop:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"shunt_voltage_drop\" name=\"shunt_voltage_drop\" value=\"" + String(globalConfigData.shunt_voltage_drop) + "\" min=\"10\" max=\"85\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"shunt_voltage_drop_value\">" + String(globalConfigData.shunt_voltage_drop, 0) + "</span>mV</td></tr>";
+
+    html += "<tr><td><label for=\"shunt_max_current\">Shunt current Max:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"shunt_max_current\" name=\"shunt_max_current\" value=\"" + String(globalConfigData.shunt_max_current) + "\" min=\"10\" max=\"200\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"shunt_max_current_value\">" + String(globalConfigData.shunt_max_current, 0) + "</span>A</td></tr>";
+
+    html += "<tr><td><label for=\"temp_min\">Temperature Min:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"temp_min\" name=\"temp_min\" value=\"" + String(globalConfigData.temp_min) + "\" min=\"0\" max=\"100\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"temp_min_value\">" + String(globalConfigData.temp_min, 0) + "</span>&deg;C</td></tr>";
+
+    html += "<tr><td><label for=\"temp_max\">Temperature Max:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"temp_max\" name=\"temp_max\" value=\"" + String(globalConfigData.temp_max) + "\" min=\"0\" max=\"100\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"temp_max_value\">" + String(globalConfigData.temp_max, 0) + "</span>&deg;C</td></tr>";
+
+    html += "<tr><td><label for=\"humidity_min\">Himidity Min:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"humi_min\" name=\"humi_min\" value=\"" + String(globalConfigData.humi_min) + "\" min=\"0\" max=\"100\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"humi_min_value\">" + String(globalConfigData.humi_min, 0) + "</span>%</td></tr>";
+
+    html += "<tr><td><label for=\"humidity_max\">Humidity Max:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"humi_max\" name=\"humi_max\" value=\"" + String(globalConfigData.humi_max) + "\" min=\"0\" max=\"100\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"humi_max_value\">" + String(globalConfigData.humi_max, 0) + "</span>%</td></tr>";
+
+    html += "<tr><td><label for=\"current_min\">Current Min:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"current_min\" name=\"current_min\" value=\"" + String(globalConfigData.current_min) + "\" min=\"-100\" max=\"100\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"current_min_value\">" + String(globalConfigData.current_min, 0) + "</span>A</td></tr>";
+
+    html += "<tr><td><label for=\"current_max\">Current Max:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"current_max\" name=\"current_max\" value=\"" + String(globalConfigData.current_max) + "\" min=\"-100\" max=\"100\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"current_max_value\">" + String(globalConfigData.current_max, 0) + "</span>A</td></tr>";
+
+    html += "<tr><td><label for=\"current_fact\">Current correction factor:</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"current_fact\" name=\"current_fact\" value=\"" + String(globalConfigData.current_fact,0) + "\" min=\"1\" max=\"3000\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"current_fact_value\">" + String(globalConfigData.current_fact/100,2) + "</span>(div. by 100)</td></tr>";
+
+    html += "<tr><td><label for=\"time_ina226_refresh\">Ina226 update interval (s):</label></td><td>&nbsp;</td>";
+    html += "<td class=\"slider-container\"><input type=\"range\" id=\"time_ina226_refresh\" name=\"time_ina226_refresh\" value=\"" + String(globalConfigData.time_ina226_refresh,0) + "\" min=\"10\" max=\"120\" step=\"1\">";
+    html += "<span class=\"slider-value\" id=\"time_ina226_refresh_value\">" + String(globalConfigData.time_ina226_refresh,0) + "</span>sek.</td></tr>";
+
+    html += "</table><br>";
+
+    html += "<button type=\"button\" onclick=\"saveConfig()\">Save Config</button></form>";
+    html += "<button onclick=\"location.reload()\">Reset</button>";
+
+    html += "<div id=\"responseMessage\" style=\"display: none;\"></div>";
+
+    html += "<script>";
+
+    html += "function showNotification(message, isSuccess) {";
+    html += "    var notification = document.createElement('div');";
+    html += "    notification.className = isSuccess ? 'success-notification' : 'error-notification';";
+    html += "    notification.innerHTML = message;";
+    html += "    document.body.appendChild(notification);";
+    html += "    setTimeout(function() {";
+    html += "        document.body.removeChild(notification);";
+    html += "    }, 3000);";
+    html += "}";
+
+    html += "function saveConfig() {var form = document.getElementById('configForm');";
+    html += "var formData = new FormData(form);";
+    html += "var jsonData = {};";
+    html += "formData.forEach(function(value, key){jsonData[key] = value;});";
+    html += "fetch('/saveConfig', {method: 'PUT',headers: {'Content-Type': 'application/json'},body: JSON.stringify(jsonData)})";
+    html += ".then(response => response.json())";
+    html += ".then(data => { showNotification('Successful saved config', data.message.toLowerCase() === 'ok'); })";
+    html += ".catch(error => { console.error('Error:', error); });}";
+
+    html += "document.getElementById('temp_min').addEventListener('input', function() {";
+    html += "document.getElementById('temp_min_value').innerText = this.value;});";
+    html += "document.getElementById('temp_max').addEventListener('input', function() {";
+    html += "document.getElementById('temp_max_value').innerText = this.value;});";
+    html += "document.getElementById('humi_min').addEventListener('input', function() {";
+    html += "document.getElementById('humi_min_value').innerText = this.value;});";
+    html += "document.getElementById('humi_max').addEventListener('input', function() {";
+    html += "document.getElementById('humi_max_value').innerText = this.value;});";
+    html += "document.getElementById('current_min').addEventListener('input', function() {";
+    html += "document.getElementById('current_min_value').innerText = this.value;});";
+    html += "document.getElementById('current_max').addEventListener('input', function() {";
+    html += "document.getElementById('current_max_value').innerText = this.value;});";
+    html += "document.getElementById('current_fact').addEventListener('input', function() {";
+    html += "document.getElementById('current_fact_value').innerText = this.value / 100.0;});";
+    html += "document.getElementById('shunt_voltage_drop').addEventListener('input', function() {";
+    html += "document.getElementById('shunt_voltage_drop_value').innerText = this.value;});";
+    html += "document.getElementById('shunt_max_current').addEventListener('input', function() {";
+    html += "document.getElementById('shunt_max_current_value').innerText = this.value;});";
+    html += "document.getElementById('max_capacity').addEventListener('input', function() {";
+    html += "document.getElementById('max_capacity_value').innerText = this.value;});";
+    html += "document.getElementById('time_ina226_refresh').addEventListener('input', function() {";
+    html += "document.getElementById('time_ina226_refresh_value').innerText = this.value;});";
+
+    html += "</script></body></html>";
+
+    server.send(200, cs_textHtml, html);
+}
+
+
+void handleSaveConfig() {
+    if (server.hasArg("plain")) {
+
+        Serial.println("Received new config data:");
+        Serial.println(server.arg("plain"));
+
+        // JSON-Payload analysieren
+        DynamicJsonDocument jsonDoc(1024);
+        deserializeJson(jsonDoc, server.arg("plain"));
+
+        // Parameter überprüfen und in die Konfiguration übertragen
+        if (jsonDoc.containsKey("temp_min")) {
+            float temp_min = jsonDoc["temp_min"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.temp_min = temp_min;
+        }
+
+        if (jsonDoc.containsKey("temp_max")) {
+            float temp_max = jsonDoc["temp_max"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.temp_max = temp_max;
+        }
+
+        if (jsonDoc.containsKey("humi_min")) {
+            float humi_min = jsonDoc["humi_min"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.humi_min = humi_min;
+        }
+
+        if (jsonDoc.containsKey("humi_max")) {
+            float humi_max = jsonDoc["humi_max"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.humi_max = humi_max;
+        }
+
+        if (jsonDoc.containsKey("current_min")) {
+            float current_min = jsonDoc["current_min"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.current_min = current_min;
+        }
+
+        if (jsonDoc.containsKey("current_max")) {
+            float current_max = jsonDoc["current_max"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.current_max = current_max;
+        }
+
+        if (jsonDoc.containsKey("shunt_voltage_drop")) {
+            float shunt_voltage_drop = jsonDoc["shunt_voltage_drop"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.shunt_voltage_drop = shunt_voltage_drop;
+        }
+
+        if (jsonDoc.containsKey("shunt_max_current")) {
+            float shunt_max_current = jsonDoc["shunt_max_current"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.shunt_max_current = shunt_max_current;
+        }
+
+        if (jsonDoc.containsKey("max_capacity")) {
+            float max_capacity = jsonDoc["max_capacity"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.max_capacity = max_capacity;
+        }
+
+        if (jsonDoc.containsKey("time_ina226_refresh")) {
+            float time_ina226_refresh = jsonDoc["time_ina226_refresh"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.time_ina226_refresh = time_ina226_refresh;
+        }
+
+        if (jsonDoc.containsKey("current_fact")) {
+            float current_fact = jsonDoc["current_fact"];
+            // Hier prüfen und in die globale Konfiguration übertragen
+            globalConfigData.current_fact = current_fact;
+        }
+
+        writeConfigToEEPROM();
+
+        if (ina226.reset())
+        {
+          Serial.println("Ina226 reset");
+          configureIna226();
+          checkError();
+        } else {
+          Serial.println("Ina226 error: can't reset and reconfigure.");
+        }
+
+        // Schicke eine Bestätigung zurück
+        server.send(200, "application/json", "{\"message\": \"ok\"}");
+    } else {
+        // Ungültige Anfrage
+        server.send(400, "text/plain", "Invalid request");
+    }
+}
+
+void handleDemoMode1() {
+  demoMode1 = true;
+  demoMode2 = false;
+  demoMode3 = false;
+  globalBusVoltage = 25.6;
+  globalEnergy = globalConfigData.max_capacity / 2;
+  handleRoot();
+}
+
+void handleDemoMode2() {
+  demoMode1 = false;
+  demoMode2 = true;
+  demoMode3 = false;
+  globalBusVoltage = 25.6;
+  globalEnergy = globalConfigData.max_capacity * 0.97;
+  handleRoot();
+}
+
+void handleDemoMode3() {
+  demoMode1 = false;
+  demoMode2 = false;
+  demoMode3 = true;
+  globalBusVoltage = 25.6;
+  globalEnergy = globalConfigData.max_capacity * 0.03;
+  handleRoot();
+}
+
+void handleResetESP() {
+
+  String message = "<html><head><title>powerMC (ESP32) "+String(FIRMWARE_VERSION)+" - reset</title>"
+                   "<script>setTimeout(function() { window.location.href = '/'; }, 10000);</script>"
+                   "<link rel=\"stylesheet\" type=\"text/css\" href=\"/css\">"
+                   "<link rel='stylesheet' href='https://unpkg.com/purecss@0.6.2/build/pure-min.css'>"
+                   "</head><body><h1>powerMC (ESP32) "+String(FIRMWARE_VERSION)+" - reset</h1>"
+                   "Rebooting...<br>"
+                   "</body></html>";
+
+  server.send(200, cs_textHtml, message);
+
+  delay(5000);
+
+  // manual reset after restart is required
+  ESP.restart();
+}
+
+void handleResetWifi() {
+
+  String message = "<html><head><title>powerMC (ESP32) "+String(FIRMWARE_VERSION)+" - reset WiFi configuration</title>"
+                   "<script>setTimeout(function() { window.location.href = '/'; }, 10000);</script>"
+                   "<link rel=\"stylesheet\" type=\"text/css\" href=\"/css\">"
+                   "<link rel='stylesheet' href='https://unpkg.com/purecss@0.6.2/build/pure-min.css'>"
+                   "</head><body><h1>owerMC (ESP32) "+String(FIRMWARE_VERSION)+" - reset WiFi configuration</h1>"
+                   "Reset WifiManager config, rebooting...<br>"
+                   "</body></html>";
+
+  server.send(200, cs_textHtml, message);
+
+  // Erase WiFi Credentials, enable, compile, flash, disable and reflash.
+  wifiManager.resetSettings();
+
+  delay(5000);
+
+  // manual reset after restart is required
+  ESP.restart();
+}
+
+void handleUpdateFirmware() {
+  String message = "<html><head><title>powerMC (ESP32) " + String(FIRMWARE_VERSION) + " - firmware update</title>"
+                   "<link rel=\"stylesheet\" type=\"text/css\" href=\"/css\">"
+                   "<link rel='stylesheet' href='https://unpkg.com/purecss@0.6.2/build/pure-min.css'>"
+                   "</head><body><h1>powerMC (ESP32) " + String(FIRMWARE_VERSION) + " - firmware update</h1>"
+                   "<p><a href='"+cs_rootPath+"'>Main</a></p><br>"
+                   "<button onclick='window.location.href=\"/updateFirmwareAction\";'>Update Firmware</button>"
+                   "</body></html>";
+
+  server.send(200, cs_textHtml, message);
+}
+
+void handleUpdateFirmwareAction() {
+
+  if (fwUpdate_isRunning)
+  {
+      Serial.println("Firmware-Update is running...");
+      if (updateStatus == "") {
+        updateStatus = "Firmware-Update is running...<br>";
+      }
+      server.send(200, cs_textHtml, updateStatus);
+  } else {
+
+    String message = "<html><head><title>powerMC (ESP32) " + String(FIRMWARE_VERSION) + " - firmware update</title>"
+"<script>"
+"function readUpdateFirmwareStatus() {"
+"  var xhr = new XMLHttpRequest();"
+"  xhr.onreadystatechange = function() {"
+"    if (xhr.readyState == 4) {"
+"      document.getElementById('updateStatus').innerHTML = xhr.responseText;"
+"      if (xhr.responseText.includes('Firmware update successful')) { "
+"        setTimeout(function() { "
+"          window.location.href = '" + cs_resetESPPath + "'; "
+"        }, 5000); }"
+"    }"
+"  };"
+"  xhr.timeout = 1000;"
+"  xhr.open('GET', '/readUpdateFirmwareStatus', true);"
+"  xhr.send();"
+"}"
+"setInterval(readUpdateFirmwareStatus, 2000);"
+"</script>"
+"<link rel=\"stylesheet\" type=\"text/css\" href=\"/css\">"
+"<link rel='stylesheet' href='https://unpkg.com/purecss@0.6.2/build/pure-min.css'>"
+"</head><body><h1>powerMC (ESP32) " + String(FIRMWARE_VERSION) + " - firmware update</h1><br>"
+"<p>Updating...</p>"
+"<div id='updateStatus'></div>"
+"</body></html>";
+
+    server.send(200, cs_textHtml, message);
+
+    disableWatchdog();
+
+    updateStatus = "";
+
+    Serial.print(cs_startingFirmwareUpdate);
+    ESPhttpUpdate.rebootOnUpdate(false);
+    t_httpUpdate_return ret = ESPhttpUpdate.update(String(FIRMWARE_UPDATE_URL));
+    fwUpdate_isRunning = true;
+
+    Serial.println(cs_finish);
+
+    switch (ret) {
+      case HTTP_UPDATE_FAILED:
+        Serial.printf("HTTP_UPDATE_FAILED Error (%d): %s\n", ESPhttpUpdate.getLastError(), ESPhttpUpdate.getLastErrorString().c_str());
+        updateStatus  = "<b>Firmware-Update failed.</b><br>";
+        updateStatus += "<b>Last error: "+String(ESPhttpUpdate.getLastError())+"</b><br>";
+        updateStatus += "<b>Last error message: "+ESPhttpUpdate.getLastErrorString()+"</b><br>";
+        fwUpdate_isRunning = false;
+        enableWatchdog();
+        break;
+
+      case HTTP_UPDATE_NO_UPDATES:
+        Serial.println(cs_noUpdatesAvailable);
+        updateStatus = "<b>No Updates available.</b><br>";
+        fwUpdate_isRunning = false;
+        enableWatchdog();
+        break;
+
+      case HTTP_UPDATE_OK:
+        Serial.println(cs_fwUpdSuccess);
+        updateStatus = "<b>Firmware update successful, resetting in a few seconds.</b><br>";
+        fwUpdate_isRunning = false;
+        break;
+
+      default: // other
+        Serial.println(cs_unknownStatus);
+        updateStatus = "<b>Unknown status.</b><br>";
+        fwUpdate_isRunning = false;
+    }
+  }
+
+}
+
+void handleReadUpdateFirmwareStatus() {
+  if (fwUpdate_isRunning)
+  {
+      Serial.println(cs_fwUpdRunning);
+      if (updateStatus == "") {
+        updateStatus = "Firmware-Update is running...<br>";
+      }
+  }
+  server.send(200, cs_textHtml, updateStatus);
+}
+
+void handleCSS() {
+  // "<link rel="stylesheet" type="text/css" href="/css">"
+  String customCSS = R"(
+body {
+    font-family: Arial, sans-serif;
+    margin: 20px;
+}
+
+h1 {
+    color: #333;
+}
+
+p {
+    margin: 5px 0;
+}
+
+a {
+    color: #0066cc;
+    text-decoration: none;
+}
+
+#busVoltage,
+#current,
+#power,
+#energy,
+#temp,
+#humidity,
+#errorCode {
+    margin-bottom: 10px;
+}
+
+span {
+    font-weight: bold;
+}
+
+td {
+    vertical-align: top;
+    padding: 10px;
+}
+
+.success-notification {
+    position: fixed;
+    bottom: 0;
+    left: 0;
+    width: 100%;
+    background-color: #4CAF50;
+    color: #fff;
+    text-align: center;
+    padding: 10px;
+}
+
+.error-notification {
+    position: fixed;
+    bottom: 0;
+    left: 0;
+    width: 100%;
+    background-color: #f44336;
+    color: #fff;
+    text-align: center;
+    padding: 10px;
+}
+
+button {
+    font-family: Arial, sans-serif;
+    background-color: #d3d3d3;
+    color: #000;
+    padding: 10px 20px;
+    text-align: center;
+    text-decoration: none;
+    display: inline-block;
+    font-size: 16px;
+    margin: 4px 2px;
+    cursor: pointer;
+}
+
+button:active {
+    background-color: #a9a9a9; /* Dunkleres Grau beim Drücken */
+}
+)";
+
+    server.send(200, cs_textCSS, customCSS);
+}