Archiving old code

In a branch I will probably never use :)

.gitignore

@@ -10,5 +10,5 @@
 **/Makefile
 **/*.cbp
 **/node-modules/
-**/CmakeLists.txt.user
+**/CMakeLists.txt.user
 **/catch2/bin/

README.md

@@ -2,15 +2,16 @@
 
 This repository is a collection of useful code snippets and configurations.
 
-```
+```bash
-github.com/shaunrd0/klips/
+shaunrd0/klips/
 ├── ansible     # Ansible roles, playbooks, and examples
 ├── blockchain  # Blockchain related project templates and examples
 ├── cpp         # C++ programs, datastructures, and other examples
 ├── dotnet      # .NET projects and examples
+├── esp         # ESP32 projects and examples
 ├── figlet      # Figlet fonts I like :)
 ├── javascript  # Javascript projects and examples
-├── python      # Python scripts or tools I've made   
+├── python      # Python scripts and tools I've made
-├── README.md   
+├── scripts     # Bash scripts
-└── scripts     # Bash scripts
+└── README.md
 ```

ansible/README.md

@@ -1,4 +1,4 @@
-# Ansible 
+# ansible
 
 A few simple roles / plays I've put together in learning how to use Ansible can be found under their corresponding directories.
 

blockchain/eth/truffle-solidity/README.md

@@ -1,3 +1,4 @@
+# blockchain
 
 A template project for getting started working on the Ethereum blockchain.
 This project comes with basic packages for compiling and deploying Solidity contracts with Truffle.
@@ -72,7 +73,7 @@ I explain how to configure metamask on ropsten on [Knoats - Solidity](https://kn
 
 Give yourself test Ethereum with the [Ropsten ETH Faucet](https://faucet.ropsten.be)
 
-To deploy to ropsten test network, and verify using `truffle-verify-plugin` - 
+To deploy to ropsten test network, and verify using `truffle-verify-plugin` -
 
 ```asm
 npx truffle migrate --network ropsten

cpp/README.md

@@ -1,4 +1,4 @@
-# Cpp
+# cpp
 
 ```bash
 shaunrd0/klips/cpp/
@@ -13,11 +13,11 @@ shaunrd0/klips/cpp/
 └── README.md
 ```
 
-This directory contains a `CMakeLists.txt`, which can be selected to open as a 
+This directory contains a `CMakeLists.txt`, which can be selected to open as a
 project within your preferred IDE. From there, all nested examples can be built,
 debugged, and ran.
 
-Some of the more recent projects in this repository requires the latest CMake LTS. 
+Some of the more recent projects in this repository requires the latest CMake LTS.
 To install `cmake` LTS with `apt` we can follow [official instructions from kitware](https://apt.kitware.com/)
 Alternatively, we can install the LTS with python's `pip`.
 ```bash
@@ -34,7 +34,7 @@ cmake version 3.22.1
 
 Once cmake is installed, dependencies for all examples can be installed with the command below.
 ```bash
-sudo apt install libsdl2-dev freeglut3-dev 
+sudo apt install libsdl2-dev freeglut3-dev
 ```
 
 If we build from this directory, we build all C++ projects and examples
@@ -63,7 +63,7 @@ graph-test-object            sdl-test              visitor-test
 graph-test-simple            select-sort
 ```
 
-We can also build from subdirectories. 
+We can also build from subdirectories.
 To only build projects related to design patterns we build from the `patterns/` subdirectory, for example
 ```bash
 cd /path/to/klips/cpp/patterns
@@ -80,5 +80,5 @@ adapter-test           factory-test  prototype-test  state-test
 
 If cmake is not being used in a project, it can be built with `g++` manually using
 the commands outlined in `*/.vscode/tasks.json`, or by using VSCode to open the example
-and running the build task. 
+and running the build task.
 Check the header comments in the main source file for the example for instructions.

cpp/problems/CMakeLists.txt

@@ -0,0 +1,21 @@
+################################################################################
+## Author: Shaun Reed                                                         ##
+## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
+## About: A root project for C++ practice problems and solutions              ##
+##                                                                            ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
+################################################################################
+
+cmake_minimum_required(VERSION 3.16)
+
+project(
+    #[[NAME]]   Problems
+    VERSION     1.0
+    DESCRIPTION "Practice problems and solutions written in C++"
+    LANGUAGES   CXX
+)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY, ${CMAKE_BINARY_DIR}/bin)
+add_compile_options("-Wall")
+
+add_subdirectory(graphs)

cpp/problems/README.md

@@ -0,0 +1,24 @@
+# Problems
+
+A collection of some example problems and solutions written in C++. Mostly these
+are based off questions I found on [hackerrank](https://www.hackerrank.com), 
+[leetcode](https://leetcode.com/), [codility](https://www.codility.com/), or 
+similar programming practice platforms.
+
+```
+klips/cpp/problems
+.
+├── graphs     # Graph implementations with related problems and solutions
+└── README.md 
+```
+
+We can build the examples with the following commands.
+
+```bash
+cd /path/to/klips/cpp/problems/
+mkdir build && cd build
+cmake .. && cmake --build .
+ls bin/
+
+problems-graphs
+```

cpp/problems/graphs/CMakeLists.txt

@@ -0,0 +1,21 @@
+################################################################################
+## Author: Shaun Reed                                                         ##
+## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
+## About: Collection of problems and solutions to graph problems in C++       ##
+##                                                                            ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
+################################################################################
+
+cmake_minimum_required(VERSION 3.16)
+
+project(
+    #[[NAME]]   ProblemsGraphs
+    VERSION     1.0
+    DESCRIPTION "Problems and solutions using graphs in C++"
+    LANGUAGES   CXX
+)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+add_compile_options("-Wall")
+
+add_executable(problems-graphs driver.cpp lib-graph.cpp lib-graph.hpp)

cpp/problems/graphs/driver.cpp

@@ -0,0 +1,32 @@
+/*##############################################################################
+## Author: Shaun Reed                                                         ##
+## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
+## About: Driver program solving various C++ graph problems                   ##
+##                                                                            ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
+################################################################################
+*/
+
+#include <iostream>
+
+#include "lib-graph.hpp"
+
+int main(const int argc, const char * argv[]) {
+  Simple::Graph g({ {1,2,3}, {2,3,4} });
+  g.Print();
+  std::cout << std::endl;
+
+  std::vector<int> graphA = {6,0,1,2,3,4,5};
+  std::vector<std::pair<int, int>> graphB = { {9, 2}, {2, 3}, {3, 1} };
+  std::vector<std::vector<int>> graphC = {{1}, {2, 3}, {3, 1, 0}};
+  g.ReadEdges(graphA);
+  g.Print();
+  std::cout << std::endl;
+  g.ReadEdges(graphB);
+  g.Print();
+  std::cout << std::endl;
+  g.ReadEdges(graphC);
+  g.Print();
+
+  return 0;
+}

cpp/problems/graphs/lib-graph.cpp

@@ -0,0 +1,12 @@
+/*##############################################################################
+## Author: Shaun Reed                                                         ##
+## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
+## About: Graph implementations to solve various problems in C++              ##
+##                                                                            ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
+################################################################################
+*/
+
+#include "lib-graph.hpp"
+
+

cpp/problems/graphs/lib-graph.hpp

@@ -0,0 +1,335 @@
+/*##############################################################################
+## Author: Shaun Reed                                                         ##
+## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
+## About: Graph implementations to solve various problems in C++              ##
+##                                                                            ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
+################################################################################
+*/
+
+#include <iostream>
+#include <unordered_map>
+#include <map>
+#include <utility>
+#include <vector>
+#include <algorithm>
+#include <cstdint>
+
+#ifndef GRAPHS_LIB_GRAPH_HPP
+#define GRAPHS_LIB_GRAPH_HPP
+
+
+namespace Simple {
+  typedef int32_t Node;
+  typedef std::vector<Node> Nodes;
+  typedef std::vector<Nodes> Edges;
+
+  class Graph {
+  public:
+    Graph() = default;
+    explicit Graph(Edges e) : edges(std::move(e)) { }
+
+    void Print()
+    {
+      for (size_t node = 0; node < edges.size(); node++) {
+        for (const auto & to : edges[node]) {
+          std::cout << "(" << node << ")-----(" << to << ")" << std::endl;
+        }
+      }
+    }
+
+    // Where graph[i] represents the connection between node i and graph[i]
+    // {1, 1, 2, 2}
+    void ReadEdges(const std::vector<int> & graph)
+    {
+      edges.clear();
+      edges.assign(graph.size(), {});
+      for (int i = 0; i < graph.size(); i++) {
+        if (i == graph[i]) continue;
+        edges[graph[i]].push_back(i);
+        edges[i].push_back(graph[i]);
+      }
+    }
+
+    // Where each graph[i] represents a single edge between two nodes
+    // { {1, 2}, {2, 3}, {3, 1} }
+    void ReadEdges(const std::vector<std::pair<int, int>> & graph)
+    {
+      edges.clear();
+      for (const auto & edge : graph) {
+        while (edges.size() <= edge.first || edges.size() <= edge.second) {
+          edges.emplace_back();
+        }
+        edges[edge.first].push_back(edge.second);
+        edges[edge.second].push_back(edge.first);
+      }
+    }
+
+    // Where graph[node] holds all connected adjacent nodes
+    // {{1}, {2, 3}, {2, 1, 0}}
+    void ReadEdges(const std::vector<std::vector<int>> & graph)
+    {
+      edges.clear();
+      edges.assign(graph.size(), {});
+      for (size_t i = 0; i < graph.size(); i++) {
+        for (const auto & adj : graph[i]) {
+          if (adj == i) continue;
+          edges[i].push_back(adj);
+          edges[adj].push_back(int32_t(i));
+        }
+      }
+    }
+
+  private:
+    Edges edges;
+  };
+}
+
+
+namespace Object {
+  struct Node {
+    Node() : val(INT32_MIN), adj() { }
+    explicit Node(int32_t v) : val(v), adj() { }
+    Node(int32_t v, std::vector<int32_t> a) : val(v), adj(std::move(a)) { }
+
+    int32_t val;
+    std::vector<int32_t> adj;
+
+    // Define operator== for std::find; And comparisons between nodes
+    bool operator==(const Node & b) const { return this->val == b.val;}
+    bool operator!=(const Node & b) const { return this->val != b.val;}
+  };
+
+  typedef std::vector<Node> Edges;
+
+  class Graph {
+  public:
+    Graph() = default;
+    explicit Graph(Edges e) : edges(std::move(e)) { }
+
+    void Print()
+    {
+      for (int32_t node = 0; node < edges.size(); node++) {
+        for (const auto & to : GetNode(node)->adj) {
+          std::cout << "(" << node << ")-----(" << to << ")" << std::endl;
+        }
+      }
+    }
+
+    Node * GetNode(const int32_t & nodeVal)
+    {
+      auto foundNode = std::find(edges.begin(), edges.end(), Node(nodeVal));
+//                       [nodeVal](const Node & a)->bool { return a.val == nodeVal;});
+      if (foundNode == edges.end()) return nullptr; // Node does not exist
+      return &*foundNode;
+    }
+
+    Node * CreateNode(const int32_t & nodeVal)
+    {
+      auto newNode = GetNode(nodeVal);
+      if (newNode != nullptr) return newNode;
+      // Create node if not found
+      edges.emplace_back(nodeVal); // Calls Node(int32_t) ctor
+      return &edges.back(); // Get ptr to our new node; Don't copy it
+    }
+
+    // Where graph[i] represents the connection between node i and graph[i]
+    // {1, 1, 2, 2}
+    void ReadEdges(const std::vector<int> & graph)
+    {
+      edges.clear();
+      for (int i = 0; i < graph.size(); i++) {
+        if (i == graph[i]) continue;
+        // Check if nodes already exist; Create them if not found
+        auto nodeFrom = CreateNode(graph[i]);
+        auto nodeTo = CreateNode(i);
+        // Push node ptr to adjacent list
+        nodeFrom->adj.push_back(nodeTo->val);
+        nodeTo->adj.push_back(nodeFrom->val);
+      }
+    }
+
+    // Where each graph[i] represents a single edge between two nodes
+    // { {1, 2}, {2, 3}, {3, 1} }
+    void ReadEdges(const std::vector<std::pair<int, int>> & graph)
+    {
+      edges.clear();
+      for (const auto & edge : graph) {
+        auto nodeFrom = CreateNode(edge.first);
+        auto nodeTo = CreateNode(edge.second);
+        nodeFrom->adj.push_back(nodeTo->val);
+        nodeTo->adj.push_back(nodeFrom->val);
+      }
+    }
+
+    // Where graph[node] holds all connected adjacent nodes
+    // {{1}, {2, 3}, {2, 1, 0}}
+    void ReadEdges(const std::vector<std::vector<int>> & graph)
+    {
+      edges.clear();
+      edges.assign(graph.size(), {});
+      for (size_t i = 0; i < graph.size(); i++) {
+        for (const auto & adj : graph[i]) {
+          if (adj == i) continue;
+          auto nodeFrom = CreateNode(int32_t(i));
+          auto nodeTo = CreateNode(adj);
+          nodeFrom->adj.push_back(nodeTo->val);
+          nodeTo->adj.push_back(nodeFrom->val);
+        }
+      }
+    }
+
+  private:
+    Edges edges;
+  };
+}
+
+namespace Weighted {
+  using Weight = int32_t;
+  using Adjacent = std::multimap<Weight, int32_t>;
+  struct Node {
+    Node() : val(INT32_MIN), adj() { }
+    explicit Node(int32_t v) : val(v), adj() { }
+    Node(int32_t v, Adjacent a) : val(v), adj(std::move(a)) { }
+
+    int32_t val;
+    Adjacent adj;
+  };
+  using Edge = std::pair<int, int>;
+
+  class Graph {
+    Graph() = default;
+    explicit Graph(Node n) : root(std::move(n)) { }
+    void ReadGraph(std::vector<std::vector<int>> nodeList)
+    {
+      // Read a 2D vector of nodes into a
+    }
+  private:
+    Node root;
+  };
+}
+
+
+//namespace Object {
+//struct Edge {
+//    friend struct Node;
+//    friend class Graph;
+//    Edge() : from(INT32_MIN), to(INT32_MIN) { }
+//    Edge(const int32_t & f, const int32_t & t) : from(f), to(t) { }
+//
+//  private:
+//    int32_t from, to;
+//  };
+//  using Edges = std::vector<Edge>;
+//
+////  template <typename T, typename S>
+////  struct Subscriptor {
+////    T<int32_t, S> data;
+////  };
+//
+//  struct Node {
+//    using Adjacent = std::vector<Node *>;
+//    using NodeMap = std::unordered_map<int32_t, Node *>;
+//    friend class Graph; // Allow Graph to access protected / private members
+//    friend struct GraphData;
+//
+//    // Struct is public by default
+//    Node () : val(0), adj() { }
+//    explicit Node(int32_t v) : val(v), adj() { }
+//    Node(int32_t v, Adjacent a) : val(v), adj(std::move(a)) { }
+//    inline void SetAdjacent(Adjacent a) { adj = std::move(a);}
+//    inline void SetVal(int32_t v) { val = v;}
+//    NodeMap GetNodeMap() {
+//      NodeMap result;
+//      BuildNodeMap(&result);
+//      return result;
+//    }
+//    void BuildNodeMap(NodeMap & nodeMap, Node * startNode=nullptr) {
+//      auto list = startNode == nullptr ? adj : startNode->adj;
+//      for (const auto & node : list) {
+//        if (!nodeMap.count(node->val)) {
+//          nodeMap[node->val] = node;
+//          BuildNodeMap(nodeMap, startNode);
+//        }
+//      }
+//    }
+//
+//  protected:
+//    int32_t val;
+//    Adjacent adj;
+//    Edges edges;
+//  };
+//
+//  struct GraphData {
+//    GraphData() = default;
+//    explicit GraphData(const Node & n)
+//    {
+//      graphEdges n.edges;
+//      for (const auto & edge : n.edges) {
+//      }
+//    }
+//
+//    // Implement subscript operators for unordered_multimap
+//    struct GraphEdges {
+//      Edges * operator[](int32_t nodeVal) {
+//        auto found = graphEdges.find(nodeVal):
+//        if (found != graphEdges.end()) {
+//          return &*found->second;
+//        }
+//        else {
+//          return nullptr;
+//        }
+//      }
+//      std::unordered_multimap<int32_t, Edges *> graphEdges;
+//    };
+//
+//    // Implement subscript operators for unordered_map
+//    struct GraphNodes {
+//      Node * operator[](int32_t nodeVal) {
+//        auto found = graphNodes.find(nodeVal):
+//        if (found != graphNodes.end()) {
+//          return &*found->second;
+//        }
+//        else {
+//          return nullptr;
+//        }
+//      }
+//      std::unordered_map<int32_t, Node *> graphNodes;
+//    };
+//    // unordered_* provides O(1) access and search
+//    GraphEdges graphEdges;
+//    GraphNodes graphNodes;
+//  };
+//
+//  class Graph {
+//    // Class is private by default
+//    Node root;
+//    std::unordered_map<int32_t, Node *> graphNodes;
+//    std::multimap<int32_t, Edges> graphEdges;
+////    std::unordered_map<int32_t, Node *> graphNodes;
+////    GraphData data; // Struct containing all graph edges / nodes
+//
+//  public:
+//    Graph() = default;
+//    explicit Graph(Node r) : root(std::move(r)) { }
+//
+//    inline const Node & GetRoot() const { return root;}
+////    inline Node * GetNode(int32_t nodeVal) { return data.graphNodes[nodeVal];}
+////    inline const Node * GetConstNode(int32_t nodeVal)
+////    { return data.graphNodes[nodeVal];}
+//
+//    const Node * DFS(int32_t nodeVal, int32_t startNode=INT32_MIN)
+//    {
+//      // If startNode was not set, begin search from root node
+//      startNode = startNode == INT32_MIN ? root.val : startNode;
+//      if (startNode == nodeVal) {
+//        return graphNodes[nodeVal];
+//      }
+//      for (const auto & edge : root.edges) {
+//        return DFS(nodeVal, edge.to);
+//      }
+//    }
+//  };
+//}
+
+#endif // GRAPHS_LIB_GRAPH_HPP

cpp/qt/designer-plugin-collection/CMakeLists.txt.user

@@ -1,197 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 9.0.1, 2022-12-24T09:28:53. -->
-<qtcreator>
- <data>
-  <variable>EnvironmentId</variable>
-  <value type="QByteArray">{ce8a8d3d-318d-4c62-a573-71d1755252ce}</value>
- </data>
- <data>
-  <variable>ProjectExplorer.Project.ActiveTarget</variable>
-  <value type="qlonglong">0</value>
- </data>
- <data>
-  <variable>ProjectExplorer.Project.EditorSettings</variable>
-  <valuemap type="QVariantMap">
-   <value type="bool" key="EditorConfiguration.AutoIndent">true</value>
-   <value type="bool" key="EditorConfiguration.AutoSpacesForTabs">false</value>
-   <value type="bool" key="EditorConfiguration.CamelCaseNavigation">true</value>
-   <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.0">
-    <value type="QString" key="language">Cpp</value>
-    <valuemap type="QVariantMap" key="value">
-     <value type="QByteArray" key="CurrentPreferences">CppGlobal</value>
-    </valuemap>
-   </valuemap>
-   <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.1">
-    <value type="QString" key="language">QmlJS</value>
-    <valuemap type="QVariantMap" key="value">
-     <value type="QByteArray" key="CurrentPreferences">QmlJSGlobal</value>
-    </valuemap>
-   </valuemap>
-   <value type="qlonglong" key="EditorConfiguration.CodeStyle.Count">2</value>
-   <value type="QByteArray" key="EditorConfiguration.Codec">UTF-8</value>
-   <value type="bool" key="EditorConfiguration.ConstrainTooltips">false</value>
-   <value type="int" key="EditorConfiguration.IndentSize">4</value>
-   <value type="bool" key="EditorConfiguration.KeyboardTooltips">false</value>
-   <value type="int" key="EditorConfiguration.MarginColumn">80</value>
-   <value type="bool" key="EditorConfiguration.MouseHiding">true</value>
-   <value type="bool" key="EditorConfiguration.MouseNavigation">true</value>
-   <value type="int" key="EditorConfiguration.PaddingMode">1</value>
-   <value type="bool" key="EditorConfiguration.PreferSingleLineComments">false</value>
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-   <value type="bool" key="EditorConfiguration.ShowMargin">false</value>
-   <value type="int" key="EditorConfiguration.SmartBackspaceBehavior">0</value>
-   <value type="bool" key="EditorConfiguration.SmartSelectionChanging">true</value>
-   <value type="bool" key="EditorConfiguration.SpacesForTabs">true</value>
-   <value type="int" key="EditorConfiguration.TabKeyBehavior">0</value>
-   <value type="int" key="EditorConfiguration.TabSize">8</value>
-   <value type="bool" key="EditorConfiguration.UseGlobal">true</value>
-   <value type="bool" key="EditorConfiguration.UseIndenter">false</value>
-   <value type="int" key="EditorConfiguration.Utf8BomBehavior">1</value>
-   <value type="bool" key="EditorConfiguration.addFinalNewLine">true</value>
-   <value type="bool" key="EditorConfiguration.cleanIndentation">true</value>
-   <value type="bool" key="EditorConfiguration.cleanWhitespace">true</value>
-   <value type="QString" key="EditorConfiguration.ignoreFileTypes">*.md, *.MD, Makefile</value>
-   <value type="bool" key="EditorConfiguration.inEntireDocument">false</value>
-   <value type="bool" key="EditorConfiguration.skipTrailingWhitespace">true</value>
-   <value type="bool" key="EditorConfiguration.tintMarginArea">true</value>
-  </valuemap>
- </data>
- <data>
-  <variable>ProjectExplorer.Project.PluginSettings</variable>
-  <valuemap type="QVariantMap">
-   <valuemap type="QVariantMap" key="AutoTest.ActiveFrameworks">
-    <value type="bool" key="AutoTest.Framework.Boost">true</value>
-    <value type="bool" key="AutoTest.Framework.CTest">false</value>
-    <value type="bool" key="AutoTest.Framework.Catch">true</value>
-    <value type="bool" key="AutoTest.Framework.GTest">true</value>
-    <value type="bool" key="AutoTest.Framework.QtQuickTest">true</value>
-    <value type="bool" key="AutoTest.Framework.QtTest">true</value>
-   </valuemap>
-   <valuemap type="QVariantMap" key="AutoTest.CheckStates"/>
-   <value type="int" key="AutoTest.RunAfterBuild">0</value>
-   <value type="bool" key="AutoTest.UseGlobal">true</value>
-   <valuemap type="QVariantMap" key="ClangTools">
-    <value type="bool" key="ClangTools.AnalyzeOpenFiles">true</value>
-    <value type="bool" key="ClangTools.BuildBeforeAnalysis">true</value>
-    <value type="QString" key="ClangTools.DiagnosticConfig">Builtin.DefaultTidyAndClazy</value>
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cpp/qt/designer-plugin/CMakeLists.txt.user

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cpp/qt/designer/CMakeLists.txt.user

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dotnet/README.md

@@ -1,4 +1,4 @@
-# Dotnet
+# dotnet
 
 ```bash
 shaunrd0/klips/dotnet/

esp/cpp/01_led-button/01_led-button.ino

@@ -0,0 +1,38 @@
+// set pin numbers
+const int buttonPin = 4;  // the number of the pushbutton pin
+const int ledPin =  5;    // the number of the LED pin
+
+// variable for storing the pushbutton status
+int buttonState = 0;
+
+bool light_on = false;
+bool handled = false;
+
+void setup() {
+  Serial.begin(115200);
+  // initialize the pushbutton pin as an input
+  pinMode(buttonPin, INPUT);
+  // initialize the LED pin as an output
+  pinMode(ledPin, OUTPUT);
+}
+
+void loop() {
+  // read the state of the pushbutton value
+  buttonState = digitalRead(buttonPin);
+  // check if the pushbutton is pressed.
+  if (buttonState == HIGH) {
+    if (!handled) {
+      Serial.println("Handling button pressed.");
+      light_on = !light_on;
+      handled = true;
+      digitalWrite(ledPin, light_on ? HIGH : LOW);
+    }
+    // turn LED on
+  } else {
+    if (handled) {
+      Serial.println("Reset button handled state.");
+      handled = false;
+
+    }
+  }
+}

esp/cpp/01_led-button/README.md

@@ -0,0 +1,9 @@
+# 01_led-button
+
+This example is largely adapted from those in [ESP32-basic-starter-kit.pdf](./ESP32-basic-starter-kit.pdf).
+
+The APIs in the original examples paired with this PDF have changed, and I decided to do some different things with the code and/or circuits, but the original code can be [found here](https://www.dropbox.com/scl/fo/6znlij3eb23ih4jxcpv2w/AKvB1t9CCUgoVRVtGen8Yrw?rlkey=z84anl0hs940qf9fpl7l8q8q2&e=1&dl=0).
+
+![schematic](./schematic.png)
+
+Simple LED controlled by an on-board button.

esp/cpp/02_led-button-web/02_led-button-web.ino

@@ -0,0 +1,183 @@
+#include <WiFi.h>
+
+//
+// Web server project globals
+
+// Replace with your network credentials
+const char* ssid = "network-name";
+const char* password = "password";
+
+WiFiServer server(80);
+
+// Variable to store the HTTP request
+String header;
+
+// Current time
+unsigned long currentTime = millis();
+// Previous time
+unsigned long previousTime = 0;
+// Define timeout time in milliseconds (example: 2000ms = 2s)
+const long timeoutTime = 2000;
+
+//
+// Button / light project globals
+
+// set pin numbers
+const int buttonPin = 4;  // the number of the pushbutton pin
+const int ledPin =  5;    // the number of the LED pin
+
+// variable for storing the pushbutton status
+int buttonState = 0;
+
+bool light_on = false;
+bool handled = false;
+
+void setup() {
+  Serial.begin(115200);
+  // initialize the pushbutton pin as an input
+  pinMode(buttonPin, INPUT);
+  // initialize the LED pin as an output
+  pinMode(ledPin, OUTPUT);
+
+  // wait for the Serial Monitor to be open
+  while (!Serial) {
+    delay(100);
+  }
+
+  // Connect to Wi-Fi network with SSID and password
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  // Print local IP address and start web server
+  Serial.println("");
+  Serial.println("WiFi connected.");
+  Serial.println("Web Server IP address: ");
+  Serial.println(WiFi.localIP());
+  server.begin();
+}
+
+// Handles the on-board button press.
+void handleButtonPress() {
+  // read the state of the pushbutton value
+  buttonState = digitalRead(buttonPin);
+  // check if the pushbutton is pressed.
+  if (buttonState == HIGH) {
+    if (!handled) {
+      Serial.println("Handling button pressed.");
+      light_on = !light_on;
+      handled = true;
+      digitalWrite(ledPin, light_on ? HIGH : LOW);
+    }
+    // turn LED on
+  } else {
+    if (handled) {
+      Serial.println("Reset button handled state.");
+      handled = false;
+    }
+  }
+}
+
+void displayPinState(WiFiClient client, int gpio_pin, bool state) {
+  // Display current state, and ON/OFF buttons for GPIO <gpio_pin>
+  client.println(String("<p>GPIO ") + String(gpio_pin) + String(" - Current State ") + String(state ? "ON" : "OFF") + String("</p>"));
+  // If the output state is off, it displays the ON button
+  if (state) {
+    client.println(String("<p><a href=\"/") + String(gpio_pin) + String("/off\"><button class=\"button button2\">OFF</button></a></p>"));
+  } else {
+    client.println(String("<p><a href=\"/") + String(gpio_pin) + String("/on\"><button class=\"button\">ON</button></a></p>"));
+  }
+}
+
+void handleStateChange(WiFiClient client, int gpio_pin) {
+  if (header.indexOf(String("GET /") + String(gpio_pin) + String("/on")) >= 0) {
+    Serial.println(String("GPIO ") + String(gpio_pin) + String(" on"));
+    light_on = true;
+    digitalWrite(gpio_pin, HIGH);
+  } else if (header.indexOf(String("GET /") + String(gpio_pin) + String("/off")) >= 0) {
+    Serial.println(String("GPIO ") + String(gpio_pin) + String(" off"));
+    light_on = false;
+    digitalWrite(gpio_pin, LOW);
+  }
+}
+
+void loop() {
+  WiFiClient client = server.available();   // Listen for incoming clients
+
+  handleButtonPress();
+
+  if (client) {                             // If a new client connects,
+    currentTime = millis();
+    previousTime = currentTime;
+    Serial.println("New Client.");          // print a message out in the serial port
+    Serial.println("Web Server IP address: ");
+    Serial.println(WiFi.localIP());
+
+    String currentLine = "";                // make a String to hold incoming data from the client
+    while (client.connected() && currentTime - previousTime <= timeoutTime) {  // loop while the client's connected
+      // Also handle the button press in this loop to not miss events.
+      handleButtonPress();
+
+      currentTime = millis();
+      if (client.available()) {             // if there's bytes to read from the client,
+        char c = client.read();             // read a byte, then
+        Serial.write(c);                    // print it out the serial monitor
+        header += c;
+        if (c == '\n') {                    // if the byte is a newline character
+          // if the current line is blank, you got two newline characters in a row.
+          // that's the end of the client HTTP request, so send a response:
+          if (currentLine.length() == 0) {
+            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
+            // and a content-type so the client knows what's coming, then a blank line:
+            client.println("HTTP/1.1 200 OK");
+            client.println("Content-type:text/html");
+            client.println("Connection: close");
+            client.println();
+
+            // turns the GPIOs on and off
+            // Display the HTML web page
+            client.println("<!DOCTYPE html><html>");
+            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
+            client.println("<link rel=\"icon\" href=\"data:,\">");
+            // CSS to style the on/off buttons
+            // Feel free to change the background-color and font-size attributes to fit your preferences
+            client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
+            client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");
+            client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
+            client.println(".button2 {background-color: #555555;}</style></head>");
+
+            //
+            // Web Page Heading
+            client.println("<body><h1>ESP32 Web Server</h1>");
+            //
+            // Web Page Body Contents
+
+            // Button Controls
+            displayPinState(client, ledPin, light_on);
+
+            //
+            // Close Web Page Body / Heading
+            client.println("</body></html>");
+            // The HTTP response ends with another blank line
+            client.println();
+            // Break out of the while loop
+            break;
+          } else { // if you got a newline, then clear currentLine
+            currentLine = "";
+          }
+        } else if (c != '\r') {  // if you got anything else but a carriage return character,
+          currentLine += c;      // add it to the end of the currentLine
+        }
+      }
+    }
+    // Clear the header variable
+    header = "";
+    // Close the connection
+    client.stop();
+    Serial.println("Client disconnected.");
+    Serial.println("");
+  }
+}

esp/cpp/02_led-button-web/README.md

@@ -0,0 +1,15 @@
+# 02_led-button-web
+
+This example is largely adapted from those in [ESP32-basic-starter-kit.pdf](./ESP32-basic-starter-kit.pdf).
+
+The APIs in the original examples paired with this PDF have changed, and I decided to do some different things with the code and/or circuits, but the original code can be [found here](https://www.dropbox.com/scl/fo/6znlij3eb23ih4jxcpv2w/AKvB1t9CCUgoVRVtGen8Yrw?rlkey=z84anl0hs940qf9fpl7l8q8q2&e=1&dl=0).
+
+![schematic](./schematic.png)
+
+This example uses the same schematic as [01_led-button](../01_led-button/).
+
+The only difference is that you can also control the button through a web browser from any device connected to your local network.
+
+This example was adapted from the example code in the [Arduino ESP32 API reference](https://docs.espressif.com/projects/arduino-esp32/en/latest/api/wifi.html#wi-fi-ap-example).
+
+![screenshot](./screenshot.png)

esp/cpp/03_temp-humidity-web/03_temp-humidity-web.ino

@@ -0,0 +1,161 @@
+// Import required libraries
+
+#include "WiFi.h"
+#include "ESPAsyncWebServer.h"
+#include <Adafruit_Sensor.h>
+#include <DHT.h>
+
+// Replace with your network credentials
+const char* ssid = "network-name";
+const char* password = "password";
+
+#define DHTPIN 4     // Digital pin connected to the DHT sensor
+
+// Uncomment the type of sensor in use:
+#define DHTTYPE    DHT11     // DHT 11
+//#define DHTTYPE    DHT22     // DHT 22 (AM2302)
+//#define DHTTYPE    DHT21     // DHT 21 (AM2301)
+
+DHT dht(DHTPIN, DHTTYPE);
+
+// Create AsyncWebServer object on port 80
+AsyncWebServer server(80);
+
+String readDHTTemperature() {
+  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+  // Read temperature as Celsius (the default)
+  float t = dht.readTemperature();
+  // Read temperature as Fahrenheit (isFahrenheit = true)
+  //float t = dht.readTemperature(true);
+  // Check if any reads failed and exit early (to try again).
+  if (isnan(t)) {
+    Serial.println("Failed to read from DHT sensor!");
+    return "--";
+  }
+  else {
+    Serial.println(t);
+    return String(t);
+  }
+}
+
+String readDHTHumidity() {
+  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+  float h = dht.readHumidity();
+  if (isnan(h)) {
+    Serial.println("Failed to read from DHT sensor!");
+    return "--";
+  }
+  else {
+    Serial.println(h);
+    return String(h);
+  }
+}
+
+const char index_html[] PROGMEM = R"rawliteral(
+<!DOCTYPE HTML><html>
+<head>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
+  <style>
+    html {
+     font-family: Arial;
+     display: inline-block;
+     margin: 0px auto;
+     text-align: center;
+    }
+    h2 { font-size: 3.0rem; }
+    p { font-size: 3.0rem; }
+    .units { font-size: 1.2rem; }
+    .dht-labels{
+      font-size: 1.5rem;
+      vertical-align:middle;
+      padding-bottom: 15px;
+    }
+  </style>
+</head>
+<body>
+  <h2>ESP32 DHT Server</h2>
+  <p>
+    <i class="fas fa-thermometer-half" style="color:#059e8a;"></i>
+    <span class="dht-labels">Temperature</span>
+    <span id="temperature">%TEMPERATURE%</span>
+    <sup class="units">&deg;C</sup>
+  </p>
+  <p>
+    <i class="fas fa-tint" style="color:#00add6;"></i>
+    <span class="dht-labels">Humidity</span>
+    <span id="humidity">%HUMIDITY%</span>
+    <sup class="units">&percnt;</sup>
+  </p>
+</body>
+<script>
+setInterval(function ( ) {
+  var xhttp = new XMLHttpRequest();
+  xhttp.onreadystatechange = function() {
+    if (this.readyState == 4 && this.status == 200) {
+      document.getElementById("temperature").innerHTML = this.responseText;
+    }
+  };
+  xhttp.open("GET", "/temperature", true);
+  xhttp.send();
+}, 10000 ) ;
+
+setInterval(function ( ) {
+  var xhttp = new XMLHttpRequest();
+  xhttp.onreadystatechange = function() {
+    if (this.readyState == 4 && this.status == 200) {
+      document.getElementById("humidity").innerHTML = this.responseText;
+    }
+  };
+  xhttp.open("GET", "/humidity", true);
+  xhttp.send();
+}, 10000 ) ;
+</script>
+</html>)rawliteral";
+
+// Replaces placeholder with DHT values
+String processor(const String& var){
+  //Serial.println(var);
+  if(var == "TEMPERATURE"){
+    return readDHTTemperature();
+  }
+  else if(var == "HUMIDITY"){
+    return readDHTHumidity();
+  }
+  return String();
+}
+
+void setup(){
+  // Serial port for debugging purposes
+  Serial.begin(115200);
+
+  dht.begin();
+
+  // Connect to Wi-Fi
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(1000);
+    Serial.println("Connecting to WiFi..");
+  }
+
+  // Print ESP32 Local IP Address
+  Serial.println(WiFi.localIP());
+
+  // Route for root / web page
+  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
+    request->send_P(200, "text/html", index_html, processor);
+  });
+  server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
+    request->send_P(200, "text/plain", readDHTTemperature().c_str());
+  });
+  server.on("/humidity", HTTP_GET, [](AsyncWebServerRequest *request){
+    request->send_P(200, "text/plain", readDHTHumidity().c_str());
+  });
+
+  // Start server
+  server.begin();
+}
+
+void loop(){
+
+}

esp/cpp/03_temp-humidity-web/README.md

@@ -0,0 +1,60 @@
+# 03_temp-humidity-web
+
+This example is largely adapted from those in [ESP32-basic-starter-kit.pdf](./ESP32-basic-starter-kit.pdf).
+
+The APIs in the original examples paired with this PDF have changed, and I decided to do some different things with the code and/or circuits, but the original code can be [found here](https://www.dropbox.com/scl/fo/6znlij3eb23ih4jxcpv2w/AKvB1t9CCUgoVRVtGen8Yrw?rlkey=z84anl0hs940qf9fpl7l8q8q2&e=1&dl=0).
+
+![schematic](./schematic.png)
+
+Temperature and humidity sensor served on a web page within the local network.
+
+![screenshot](./screenshot.png)
+
+## Dependencies
+
+You need to install a couple of libraries for this project:
+
+* The DHT and the Adafruit Unified Sensor Driver libraries to read from the DHT sensor.
+* ESPAsyncWebServer and Async TCP libraries to build the asynchronous web server.
+
+The default Arduino IDE installation will store libraries at `~/Arduino/ibraries` - if this directory doesn't exist, create it.
+
+### Installing DHT Sensor Library
+
+To read from the DHT sensor using Arduino IDE, you need to install the [DHT sensor library](https://github.com/adafruit/DHT-sensor-library).
+
+```bash
+wget -O DHT_sensor.zip https://github.com/adafruit/DHT-sensor-library/archive/master.zip
+unzip DHT_sensor.zip
+mv DHT-sensor-library-master/ ~/Arduino/libraries/DHT_sensor
+```
+
+## Install Adafruit Unified Sensor Driver Library
+
+You also need to install the [Adafruit Unified Sensor Driver library](https://github.com/adafruit/Adafruit_Sensor) to work with the DHT sensor.
+
+```bash
+wget -O Adafruit_sensor.zip https://github.com/adafruit/Adafruit_Sensor/archive/master.zip
+unzip Adafruit_sensor.zip
+mv Adafruit_Sensor-master/ ~/Arduino/libraries/Adafruit_sensor
+```
+
+## Installing ESPAsyncWebServer Library
+
+Follow the next steps to install the [ESPAsyncWebServer library](https://github.com/me-no-dev/ESPAsyncWebServer):
+
+```bash
+wget -O ESPAsyncWebServer.zip https://github.com/me-no-dev/ESPAsyncWebServer/archive/master.zip
+unzip ESPAsyncWebServer.zip
+mv ESPAsyncWebServer-master/ ~/Arduino/libraries/ESPAsyncWebServer
+```
+
+## Installing Async TCP Library
+
+The ESPAsyncWebServer library requires the [AsyncTCP library](https://github.com/me-no-dev/AsyncTCP) to work. Follow the next steps to install that library:
+
+```bash
+wget -O AsyncTCP.zip https://github.com/me-no-dev/AsyncTCP/archive/master.zip
+unzip AsyncTCP.zip
+mv AsyncTCP-master/ ~/Arduino/libraries/AsyncTCP
+```

esp/cpp/04_esp-idf-arduino/.gitignore

@@ -0,0 +1,4 @@
+build
+managed_components
+dependencies.lock
+sdkconfig.old

esp/cpp/04_esp-idf-arduino/CMakeLists.txt

@@ -0,0 +1,18 @@
+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.26)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+project(
+    #[[NAME]]   esp-idf-arduino
+    VERSION     0.1
+    DESCRIPTION "Example ESP-IDF cmake project"
+    LANGUAGES   CXX
+)
+
+# For writing pure cmake components, see the documentation
+# https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/build-system.html#writing-pure-cmake-components
+idf_build_set_property(COMPILE_OPTIONS "-Wno-error" APPEND)

esp/cpp/04_esp-idf-arduino/README.md

@@ -0,0 +1,81 @@
+# 04_esp-idf-arduino
+
+There is no schematic for this example, it simply prints some output to the serial monitor at 115200.
+This is more of a build system example for untethering yourself from the Arduino IDE.
+
+To build this example you can run the following commands.
+
+```bash
+# See Dependencies section below for instructions.
+source ~/path/to/esp-idf/export.sh
+
+mkdir build
+cd build
+cmake ..
+make -j $(nproc)
+
+# Flash the example to the ESP.
+make flash
+
+# Check the serial monitor for 'Hello world!' output.
+idf.py monitor -b 115200
+```
+
+To flash to your ESP or access the `idf.py menuconfig` menu from the ESP-IDF you can run the same commands with `make`.
+
+```bash
+make flash
+make menuconfig
+```
+
+If Ninja is preferred:
+
+```bash
+mkdir build
+cd build
+cmake .. -G Nina
+ninja
+```
+
+## Dependencies
+
+Install the [ESP-IDF](https://github.com/espressif/esp-idf?tab=readme-ov-file#setup-build-environment)
+
+```bash
+# https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/get-started/linux-macos-setup.html#for-linux-users
+sudo apt-get install -y git wget flex bison gperf python3 python3-pip python3-venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0
+
+git clone -b v5.3.2 --recursive https://github.com/espressif/esp-idf
+cd esp-idf
+./install.sh
+. ./export.sh
+```
+
+In CLion there is an official [Serial Monitor](https://plugins.jetbrains.com/plugin/8031-serial-port-monitor) plugin, or use ESP-IDF -
+
+```bash
+idf.py monitor -b 115200
+```
+
+## Starting Over
+
+To set up this project from scratch the following commands were used
+
+```bash
+# My example project directory
+cd ~/Code/klips/esp/cpp/04_esp-idf-arduino
+idf.py set-target esp32
+idf.py add-dependency "espressif/arduino-esp32^3.1.1"
+
+# Autostart Arduino for use of `loop()` and `setup()` functions
+# You can also use the esp-idf `app_main()` function if preferred
+# https://docs.espressif.com/projects/arduino-esp32/en/latest/esp-idf_component.html#configuration
+# You can alternatively do this in the GUI tool `idf.py menuconfig`
+echo "CONFIG_AUTOSTART_ARDUINO=y" >> sdkconfig
+sed -i -e 's/CONFIG_FREERTOS_HZ=100/CONFIG_FREERTOS_HZ=1000/' sdkconfig
+
+# Build the project
+idf.py build
+```
+
+To set this project up in CLion, see [JetBrains documentation](https://www.jetbrains.com/help/clion/esp-idf.html#env-vars).

esp/cpp/04_esp-idf-arduino/main/CMakeLists.txt

@@ -0,0 +1,4 @@
+idf_component_register(
+    SRCS "main.cpp"
+    INCLUDE_DIRS "."
+)

esp/cpp/04_esp-idf-arduino/main/idf_component.yml

@@ -0,0 +1,17 @@
+## IDF Component Manager Manifest File
+dependencies:
+  ## Required IDF version
+  idf:
+    version: '>=4.1.0'
+  # # Put list of dependencies here
+  # # For components maintained by Espressif:
+  # component: "~1.0.0"
+  # # For 3rd party components:
+  # username/component: ">=1.0.0,<2.0.0"
+  # username2/component2:
+  #   version: "~1.0.0"
+  #   # For transient dependencies `public` flag can be set.
+  #   # `public` flag doesn't have an effect dependencies of the `main` component.
+  #   # All dependencies of `main` are public by default.
+  #   public: true
+  espressif/arduino-esp32: ^3.1.1

esp/cpp/04_esp-idf-arduino/main/main.cpp

@@ -0,0 +1,10 @@
+#include "Arduino.h"
+
+void setup() {
+  Serial.begin(115200);
+}
+
+void loop() {
+  Serial.println("Hello world!");
+  delay(1000);
+}

esp/cpp/05_temp-humidity-web/.gitignore

@@ -0,0 +1,4 @@
+build
+managed_components
+dependencies.lock
+sdkconfig.old

esp/cpp/05_temp-humidity-web/CMakeLists.txt

@@ -0,0 +1,18 @@
+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.26)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+project(
+    #[[NAME]]   temp-humidity-web
+    VERSION     0.1
+    DESCRIPTION "Temperature and humidity from DHT sensor served on a web page"
+    LANGUAGES   CXX
+)
+
+# For writing pure cmake components, see the documentation
+# https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/build-system.html#writing-pure-cmake-components
+idf_build_set_property(COMPILE_OPTIONS "-Wno-error" APPEND)

esp/cpp/05_temp-humidity-web/README.md

@@ -0,0 +1,27 @@
+# 05_temp-humidity-web
+
+This is the same example in [03_temp-humidity-web](./../03_temp-humidity-web), ported to the cmake ESP-IDF build system.
+
+For instructions on setting up the ESP-IDF see [04_-esp-idf-arduino](./../04_esp-idf-arduino)
+
+This example is largely adapted from those in [ESP32-basic-starter-kit.pdf](./ESP32-basic-starter-kit.pdf).
+
+The APIs in the original examples paired with this PDF have changed, and I decided to do some different things with the code and/or circuits, but the original code can be [found here](https://www.dropbox.com/scl/fo/6znlij3eb23ih4jxcpv2w/AKvB1t9CCUgoVRVtGen8Yrw?rlkey=z84anl0hs940qf9fpl7l8q8q2&e=1&dl=0).
+
+![schematic](./schematic.png)
+
+Temperature and humidity sensor served on a web page within the local network.
+
+![screenshot](./screenshot.png)
+
+To build this example run the following commands.
+
+```bash
+source ~/path/to/esp-idf/export.sh
+
+mkdir build
+cd build
+cmake ..
+make -j $(nproc)
+make flash
+```

esp/cpp/05_temp-humidity-web/main/CMakeLists.txt

@@ -0,0 +1,4 @@
+idf_component_register(
+    SRCS "main.cpp"
+    INCLUDE_DIRS "."
+)

esp/cpp/05_temp-humidity-web/main/idf_component.yml

@@ -0,0 +1,19 @@
+## IDF Component Manager Manifest File
+dependencies:
+  ## Required IDF version
+  idf:
+    version: '>=4.1.0'
+  # # Put list of dependencies here
+  # # For components maintained by Espressif:
+  # component: "~1.0.0"
+  # # For 3rd party components:
+  # username/component: ">=1.0.0,<2.0.0"
+  # username2/component2:
+  #   version: "~1.0.0"
+  #   # For transient dependencies `public` flag can be set.
+  #   # `public` flag doesn't have an effect dependencies of the `main` component.
+  #   # All dependencies of `main` are public by default.
+  #   public: true
+  espressif/arduino-esp32: ^3.1.1
+  zorxx/dht: ^1.0.1
+  esp32async/espasyncwebserver: ^3.7.0~1

esp/cpp/05_temp-humidity-web/main/main.cpp

@@ -0,0 +1,189 @@
+#include "WiFi.h"
+#include "ESPAsyncWebServer.h"
+#include "main.h"
+
+// Replace with your network credentials
+const char *ssid = "wifi";
+const char *password = "password";
+
+#define DHTPIN GPIO_NUM_4  // Digital pin connected to the DHT sensor
+
+// Uncomment the type of sensor in use:
+#define DHTTYPE      DHT_TYPE_DHT11  // DHT 11
+//#define DHTTYPE    DHT_TYPE_DHT22  // DHT 22 (AM2302)
+//#define DHTTYPE    DHT_TYPE_DHT21  // DHT 21 (AM2301)
+
+float DHT::readTemperature(bool f)
+{
+  float humidity = 0;
+  float temperature = 0;
+  esp_err_t result = dht_read_float_data(type_, gpio_, &humidity,
+                                         &temperature);
+  if (result == ESP_OK) {
+    ESP_LOGI("[DHT::readTemperature]", "Humidity: %.1f%% Temperature: %.1f°C",
+             humidity,
+             temperature);
+  } else {
+    ESP_LOGE("[DHT::readTemperature]", "Failed to read sensor data: %s",
+             esp_err_to_name(result));
+  }
+  return f ? (temperature * 1.8f) + 32 : temperature;
+}
+
+float DHT::readHumidity()
+{
+  float humidity = 0;
+  float temperature = 0;
+  esp_err_t result = dht_read_float_data(type_, gpio_, &humidity,
+                                         &temperature);
+  if (result == ESP_OK) {
+    ESP_LOGI("[DHT::readTemperature]", "Humidity: %.1f%% Temperature: %.1f°C",
+             humidity,
+             temperature);
+  } else {
+    ESP_LOGE("[DHT::readTemperature]", "Failed to read sensor data: %s",
+             esp_err_to_name(result));
+  }
+  return humidity;
+}
+
+DHT dht(DHTPIN, DHTTYPE);
+
+// Create AsyncWebServer object on port 80
+AsyncWebServer server(80);
+
+String readDHTTemperature()
+{
+  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+  float t = dht.readTemperature();
+  // Check if any reads failed and exit early (to try again).
+  if (isnan(t)) {
+    Serial.println("Failed to read from DHT sensor!");
+    return "--";
+  } else {
+    Serial.println(t);
+    return String(t);
+  }
+}
+
+String readDHTHumidity()
+{
+  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+  float h = dht.readHumidity();
+  if (isnan(h)) {
+    Serial.println("Failed to read from DHT sensor!");
+    return "--";
+  } else {
+    Serial.println(h);
+    return String(h);
+  }
+}
+
+const char index_html[] PROGMEM = R"rawliteral(
+<!DOCTYPE HTML><html>
+<head>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
+  <style>
+    html {
+     font-family: Arial;
+     display: inline-block;
+     margin: 0px auto;
+     text-align: center;
+    }
+    h2 { font-size: 3.0rem; }
+    p { font-size: 3.0rem; }
+    .units { font-size: 1.2rem; }
+    .dht-labels{
+      font-size: 1.5rem;
+      vertical-align:middle;
+      padding-bottom: 15px;
+    }
+  </style>
+</head>
+<body>
+  <h2>ESP32 DHT Server</h2>
+  <p>
+    <i class="fas fa-thermometer-half" style="color:#059e8a;"></i>
+    <span class="dht-labels">Temperature</span>
+    <span id="temperature">%TEMPERATURE%</span>
+    <sup class="units">&deg;C</sup>
+  </p>
+  <p>
+    <i class="fas fa-tint" style="color:#00add6;"></i>
+    <span class="dht-labels">Humidity</span>
+    <span id="humidity">%HUMIDITY%</span>
+    <sup class="units">&percnt;</sup>
+  </p>
+</body>
+<script>
+setInterval(function ( ) {
+  var xhttp = new XMLHttpRequest();
+  xhttp.onreadystatechange = function() {
+    if (this.readyState == 4 && this.status == 200) {
+      document.getElementById("temperature").innerHTML = this.responseText;
+    }
+  };
+  xhttp.open("GET", "/temperature", true);
+  xhttp.send();
+}, 10000 ) ;
+
+setInterval(function ( ) {
+  var xhttp = new XMLHttpRequest();
+  xhttp.onreadystatechange = function() {
+    if (this.readyState == 4 && this.status == 200) {
+      document.getElementById("humidity").innerHTML = this.responseText;
+    }
+  };
+  xhttp.open("GET", "/humidity", true);
+  xhttp.send();
+}, 10000 ) ;
+</script>
+</html>)rawliteral";
+
+// Replaces placeholder with DHT values
+String processor(const String &var)
+{
+  //Serial.println(var);
+  if (var == "TEMPERATURE") {
+    return readDHTTemperature();
+  } else if (var == "HUMIDITY") {
+    return readDHTHumidity();
+  }
+  return String();
+}
+
+void setup()
+{
+  // Serial port for debugging purposes
+  Serial.begin(115200);
+
+  // Connect to Wi-Fi
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(1000);
+    Serial.println("Connecting to WiFi..");
+  }
+
+  // Print ESP32 Local IP Address
+  Serial.println(WiFi.localIP());
+
+  // Route for root / web page
+  server.on("/", HTTP_GET, [ ](AsyncWebServerRequest *request) {
+    request->send(200, "text/html", index_html, processor);
+  });
+  server.on("/temperature", HTTP_GET, [ ](AsyncWebServerRequest *request) {
+    request->send(200, "text/plain", readDHTTemperature().c_str());
+  });
+  server.on("/humidity", HTTP_GET, [ ](AsyncWebServerRequest *request) {
+    request->send(200, "text/plain", readDHTHumidity().c_str());
+  });
+
+  // Start server
+  server.begin();
+}
+
+void loop()
+{
+
+}

esp/cpp/05_temp-humidity-web/main/main.h

@@ -0,0 +1,33 @@
+#ifndef  MAIN_H
+#define  MAIN_H
+
+#include <cstdint>
+#include "dht.h"
+
+class DHT {
+public:
+  DHT(gpio_num_t gpio, dht_sensor_type_t type) :
+      gpio_(gpio), type_(type) { }
+
+  ~DHT() = default;
+
+  /**
+   * Read temperature from DHT sensor
+   *
+   * @param f True to return in Fahrenheit, False for Celsius.
+   */
+  float readTemperature(bool f = true);
+
+  /**
+   * Read humidity from DHT sensor.
+   */
+  float readHumidity();
+
+private:
+  gpio_num_t gpio_;
+  dht_sensor_type_t type_;
+
+};
+
+
+#endif // MAIN_H

esp/cpp/README.md

@@ -0,0 +1,20 @@
+# esp
+
+```bash
+shaunrd0/klips/esp/
+├── 01_led-button               # Simple LED circuit controlled by an on board button.
+├── 02_led-button-web           # LED controlled by a button or within a web browser.
+├── 03_temp-humidity-web        # Temperature and humidity sensor within a web browser.
+├── 04_esp-idf-arduino          # CMake example instead of Arduino IDE for ESP development.
+├── 05_temp-humidity-web        # Temperature and humidity sensor within a web browser.
+├── ESP32-basic-starter-kit.pdf # PDF for tutorials in ESP32 starter kit.
+├── ESP32-dev-module.png
+└── README.md
+```
+
+Examples 1-3 are built using the Arduino IDE.
+
+All examples after `04_esp-idf-arduino` are built with cmake and the [ESP-IDF](https://github.com/espressif/esp-idf).
+
+[Arduino ESP32 GitHub](https://github.com/espressif/arduino-esp32) \
+[Arduino ESP32 API reference](https://docs.espressif.com/projects/arduino-esp32/en/latest/libraries.html)

javascript/README.md

@@ -1,9 +1,9 @@
-# Javascript
+# javascript
 
 This directory contains Javascript projects and examples that I've made.
 
-```
+```bash
-github.com/shaunrd0/klips/javascript
+shaunrd0/klips/javascript
 ├── webgl      # Examples of using WebGL within JS
 └── README.md
 ```

python/README.md

@@ -1,12 +1,13 @@
+# python
 
 This directory contains a collection of Python scripts or CLI tools that I've made.
-Each of these projects provide a `requirements.txt` that can be used to 
+Each of these projects provide a `requirements.txt` that can be used to
 install the required Python packages and dependencies.
 
 To install Python 3.9 and `pip`
 
 ```bash
-sudo apt install python3.9 python3-pip 
+sudo apt install python3.9 python3-pip
 python3.9 -m pip install -U pip
 ```