Proof of concept > OOP based approach

Brauhelferlein.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Brauhelferlein", "Brauhelferlein.vcxproj", "{C5F80730-F44F-4478-BDAE-6634EFC2CA88}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x86 = Debug|x86
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C5F80730-F44F-4478-BDAE-6634EFC2CA88}.Debug|x86.ActiveCfg = Debug|Win32
+		{C5F80730-F44F-4478-BDAE-6634EFC2CA88}.Debug|x86.Build.0 = Debug|Win32
+		{C5F80730-F44F-4478-BDAE-6634EFC2CA88}.Release|x86.ActiveCfg = Release|Win32
+		{C5F80730-F44F-4478-BDAE-6634EFC2CA88}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

Brauhelferlein.vcxproj.filters

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Brauhelferlein.ino" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="__vm\.Brauhelferlein.vsarduino.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="VisualizerClass.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="WiFiManagerClass.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="ConfigClass.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="FileStorageClass.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="WebserverManagerClass.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="StringHelper.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="PID_Handler.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="Stirrer_Handler.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>

ConfigClass.h

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+#pragma once
+
+#ifndef CONFIG_H
+#define CONFIG_H
+
+
+
+#include <EEPROM.h>
+#include "VisualizerClass.h"
+#include "Arduino.h"
+
+#define CONFIG_VERSION 1
+#define CONFIG_START 10
+
+struct StoreStruct {
+	uint8_t version;
+	double solltemp, consKp, consKi, consKd;
+} configStore;
+
+bool shouldReboot = false;
+
+
+class Config {
+public:
+	Config(Visualizer* aVisualizer) {
+		this->visualizer = aVisualizer;
+		EEPROM.begin(512);
+	}
+
+	void save() {
+		if(visualizer) visualizer->show("EE save: ",mtSerial_LCD);
+		EEPROM.put(CONFIG_START, configStore);
+		EEPROM.commit();
+		if (visualizer) visualizer->showSecondary("OK");
+	}
+
+	void load() {
+		if (visualizer) visualizer->show("EE load: ", mtSerial_LCD);
+		EEPROM.get(CONFIG_START, configStore);
+
+		if (configStore.version != CONFIG_VERSION)
+		{
+			configStore.version = CONFIG_VERSION;
+			configStore.solltemp = 24;
+			configStore.consKp = 5000;
+			configStore.consKi = 0;
+			configStore.consKd = 0;
+			save();
+		}
+	}
+private:
+	Visualizer* visualizer;
+};
+
+#endif // !CONFIG_H

FileStorageClass.h

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+#pragma once
+
+#ifndef FILESTORAGECLASS_H
+#define FILESTORAGECLASS_H
+
+
+#include <FS.h>
+#include "Arduino.h"
+
+class FileStorage {
+public:
+	inline FileStorage(Visualizer* aVisualizer)
+	{
+		this->visualizer = aVisualizer;
+	}
+
+	inline void Initialize()
+	{
+		visualizer->show("Init SPIFFS", mtSerial_LCD);
+		if (!SPIFFS.begin()) visualizer->showSecondary("begin() failed!");
+		if (!SPIFFS.format()) visualizer->showSecondary("format() failed!");
+		this->visualizer->showSecondary("SPIFFS initialized");
+		isInitialized = true;
+	}
+
+	inline String getHtmlContentFromFile(String aFileName)
+	{
+		return this->getTextfileContent(aFileName,"/html/");
+	}
+
+private:
+	Visualizer* visualizer;
+	bool isInitialized;
+
+	inline String getTextfileContent(String aFileName, String aPath)
+	{
+		if (!isInitialized)
+			this->Initialize();
+		String result = "";
+		String file = aPath + aFileName;
+
+		File fileHandle = fileHandle = SPIFFS.open(file, "r");
+		if (!fileHandle)
+		{
+			visualizer->show("File.open() failed for file: " + aFileName);
+			return  "";
+		}
+		while (fileHandle.available())
+		{
+			result += fileHandle.readStringUntil('\n');
+		}
+		fileHandle.close();
+		return result;
+	}
+
+};
+
+#endif // !FILESTORAGECLASS_H