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

src/main.cpp

@@ -0,0 +1,156 @@
+#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);
+}