first commit, added syntax for receive data from arduino uno using hardware monitor, and shown it to oled display

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

.vscode/settings.json

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+{
+    "cmake.configureOnOpen": false
+}

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32doit-devkit-v1]
+platform = espressif32
+board = esp32doit-devkit-v1
+framework = arduino
+monitor_speed = 19200
+lib_deps = 
+        adafruit/Adafruit SSD1306@^2.5.9
+	    ; bblanchon/ArduinoJson@^7.0.4

readme.md

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+### this is for esp32, where it receive the sensor data from arduino uno and send it to server, this esp32 is connected to  arduino uno and oled 128x64 for displaying the data

src/main.cpp

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+#include <Arduino.h>
+#include <WiFi.h>
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+#define SCREEN_WIDTH 128 // OLED display width, in pixels
+#define SCREEN_HEIGHT 64 // OLED display height, in pixels
+
+// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
+
+HardwareSerial fromUno(2);
+
+char c;
+String dataIn;
+
+const char *ssid = "KARAN";
+const char *password = "12345679";
+
+void displayData(String data)
+{
+  display.clearDisplay();
+
+  display.setTextSize(1);
+  display.setTextColor(WHITE);
+  display.setCursor(0, 10);
+  display.println(data);
+  display.display();
+}
+
+String ifElse(String data, String name, String stat)
+{
+  if (data != " NAN")
+  {
+    Serial.println(name + " : " + data + " " + stat);
+    return name + " : " + data + " " + stat + "\n";
+  }
+  else
+  {
+    Serial.println("Error get " + name);
+    return "Error get " + name+ '\n';
+  }
+}
+
+void seperator(String data)
+{
+  char charArray[data.length() + 1];              // Create a char array to store the string
+  data.toCharArray(charArray, sizeof(charArray)); // Convert String to char array
+
+  char *token = strtok(charArray, ","); // Tokenize the string based on comma delimiter
+  int count = 0;
+
+  String dataForDisplay = "";
+
+  while (token != NULL)
+  {
+    switch (count)
+    {
+    case 1:
+      dataForDisplay += String(token) +"\n";
+      break;
+    case 2:
+      dataForDisplay += ifElse(String(token), "Voltage", "V");
+      break;
+    case 3:
+      dataForDisplay += ifElse(String(token), "Current", "A");
+      break;
+    case 4:
+      dataForDisplay += ifElse(String(token), "Power", "W");
+      break;
+    case 5:
+      dataForDisplay += ifElse(String(token), "Energy", "kWh");
+      break;
+    case 6:
+      dataForDisplay += ifElse(String(token), "Power Factor", "pf");
+      break;
+    default:
+      dataForDisplay += ifElse(String(token), "Wifi", "");
+      break;
+    }
+    token = strtok(NULL, ","); // Get the next token
+    count++;
+  }
+
+  displayData(dataForDisplay);
+}
+
+void setup()
+{
+  Serial.begin(19200);
+  fromUno.begin(9600); // ini dari esp32
+  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))
+  { // Address 0x3D for 128x64
+    Serial.println(F("SSD1306 allocation failed"));
+    for (;;)
+      ;
+  }
+
+  // Connect to WiFi
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED)
+  {
+    delay(1000);
+    Serial.println("Connecting to WiFi...\n");
+    fromUno.print("Connecting to WiFi...\n");
+    displayData("Connecting to WiFi...");
+  }
+  Serial.println("Connected to WiFi\n");
+  fromUno.print("Connected to WiFi\n");
+  displayData("Connected to WiFi");
+}
+
+void loop()
+{
+  String wifiStatus = "";
+  if (WiFi.status() == WL_CONNECTED)
+  {
+    Serial.println("WiFi Connected\n");
+    fromUno.print("WiFi Connected\n");
+    wifiStatus += "Connected";
+    // delay(2000);
+  }
+  else
+  {
+    // toUnoWifiState.print("WiFi Disconnected\n");
+    Serial.println("WiFi Disconnected\n");
+    fromUno.print("WiFi Disconnected\n");
+    wifiStatus += "Disconnected";
+    // delay(2000);
+  }
+
+  while (fromUno.available())
+  {
+    c = fromUno.read();
+    if (c != '\n')
+    {
+      dataIn += c;
+    }
+    else
+    {
+      break;
+    }
+  }
+
+  if (c == '\n')
+  {
+    // Serial.println(dataIn);
+    seperator(wifiStatus + "," +dataIn);
+    // displayData(wifiStatus);
+    c = 0;
+    dataIn = "";
+  }
+
+  delay(2000);
+}

test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html