updated the readme

DisplayConnection.ino

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+#include <LiquidCrystal.h>
+#include <ArduinoJson.h>
+
+// LCD Pin Configuration
+LiquidCrystal lcd(14, 27, 26, 25, 33, 32);
+
+// JSON parsing buffer
+StaticJsonDocument<2048> jsonDoc;
+
+// Financial tracking structures
+struct FinancialSummary {
+  float bankBalance;
+  float totalIncome;
+  float totalExpenses;
+  float netAmount;
+  int transactionCount;
+};
+
+FinancialSummary financialData = {0, 0, 0, 0, 0};
+
+// Display states
+enum DisplayState {
+  BANK_BALANCE,
+  INCOME_EXPENSES,
+  TRANSACTION_COUNT
+};
+DisplayState currentState = BANK_BALANCE;
+
+void setup() {
+  // Initialize serial communication
+  Serial.begin(115200);
+  
+  // Initialize LCD
+  lcd.begin(16, 2);
+  lcd.clear();
+  
+  // Display startup message
+  lcd.setCursor(0, 0);
+  lcd.print("Finance Tracker");
+  lcd.setCursor(0, 1);
+  lcd.print("Waiting for Data");
+}
+
+void parseFinancialData(String jsonString) {
+  // Reset financial data
+  financialData = {0, 0, 0, 0, 0};
+  
+  // Parse JSON
+  DeserializationError error = deserializeJson(jsonDoc, jsonString);
+  
+  if (error) {
+    lcd.clear();
+    lcd.setCursor(0, 0);
+    lcd.print("JSON Error");
+    
+    Serial.print("JSON parsing failed: ");
+    Serial.println(error.c_str());
+    return;
+  }
+  
+  // Parse financial data
+  financialData.bankBalance = jsonDoc["bank_balance"].as<float>();
+  financialData.totalIncome = jsonDoc["total_income"].as<float>();
+  financialData.totalExpenses = jsonDoc["total_expenses"].as<float>();
+  financialData.netAmount = jsonDoc["net_amount"].as<float>();
+  
+  // Parse transaction count
+  JsonArray transactions = jsonDoc["recent_transactions"].as<JsonArray>();
+  financialData.transactionCount = transactions.size();
+  
+  // Display initial information
+  displayFinancialInfo();
+}
+
+void displayFinancialInfo() {
+  // Cycle through different display states
+  switch (currentState) {
+    case BANK_BALANCE:
+      displayBankBalance();
+      break;
+    case INCOME_EXPENSES:
+      displayIncomeExpenses();
+      break;
+    case TRANSACTION_COUNT:
+      displayTransactionCount();
+      break;
+  }
+  
+  // Rotate to next state
+  currentState = static_cast<DisplayState>((currentState + 1) % 3);
+}
+
+void displayBankBalance() {
+  lcd.clear();
+  lcd.setCursor(0, 0);
+  lcd.print("Bank Balance:");
+  lcd.setCursor(0, 1);
+  lcd.print("$");
+  lcd.print(financialData.bankBalance, 2);
+}
+
+void displayIncomeExpenses() {
+  lcd.clear();
+  lcd.setCursor(0, 0);
+  lcd.print("Income: $");
+  lcd.print(financialData.totalIncome, 2);
+  lcd.setCursor(0, 1);
+  lcd.print("Expense: $");
+  lcd.print(financialData.totalExpenses, 2);
+}
+
+void displayTransactionCount() {
+  lcd.clear();
+  lcd.setCursor(0, 0);
+  lcd.print("Transactions:");
+  lcd.setCursor(0, 1);
+  lcd.print("Total: ");
+  lcd.print(financialData.transactionCount);
+}
+
+void loop() {
+  // Check for incoming serial data
+  if (Serial.available()) {
+    String receivedData = Serial.readStringUntil('\n');
+    
+    // Attempt to parse received JSON
+    parseFinancialData(receivedData);
+  }
+  
+  // Display rotation every 3 seconds
+  static unsigned long lastDisplayTime = 0;
+  unsigned long currentTime = millis();
+  
+  if (currentTime - lastDisplayTime >= 3000) {
+    displayFinancialInfo();
+    lastDisplayTime = currentTime;
+  }
+}