#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Pin definitions
const int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11}; // LEDs for parking slots
const int voltagePin = 34;  // ADC pin for power supply check (ESP32)

// Parking slots status (0: free, 1: occupied)
int parkingSlots[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

// Create LCD object
LiquidCrystal_I2C lcd(0x27, 16, 2);  // LCD with I2C address 0x27, 16 columns, 2 rows

void setup() {
  // Start serial communication for debugging
  Serial.begin(115200);

  // Initialize the LCD
  lcd.begin(16, 2);  // 16 columns, 2 rows
  lcd.backlight();  // Turn on the backlight
  lcd.setCursor(0, 0);
  lcd.print("Smart Parking");

  // Initialize LED pins as output
  for (int i = 0; i < 10; i++) {
    pinMode(ledPins[i], OUTPUT);
  }

  delay(2000);  // Wait for 2 seconds to show the welcome message
}

void loop() {
  // Simulate car entry and exit by toggling parking slots every 5 seconds
  if (millis() % 5000 == 0) {
    int randomSlot = random(10);
    parkingSlots[randomSlot] = !parkingSlots[randomSlot];  // Toggle slot status
  }

  // Update the parking slot status on the LEDs and LCD
  updateParkingStatus();

  // Check the power supply voltage
  checkPowerSupply();

  delay(500);  // Delay for stability
}

void updateParkingStatus() {
  // Clear LCD screen and update parking status
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Parking Slots:");

  // Update the LEDs and LCD with parking slot status
  for (int i = 0; i < 10; i++) {
    digitalWrite(ledPins[i], parkingSlots[i]);  // Update the LED for each slot

    lcd.setCursor(i, 1);  // Set cursor for LCD
    if (parkingSlots[i] == 0) {
      lcd.print("F");  // Free slot
    } else {
      lcd.print("X");  // Occupied slot
    }
  }
}

void checkPowerSupply() {
  // Read the ADC value (power supply voltage)
  int sensorValue = analogRead(voltagePin);  // Read analog value from the ADC pin
  float voltage = sensorValue * (3.3 / 4095.0);  // Convert the ADC value to voltage

  // Print the voltage value to the Serial Monitor for debugging
  Serial.print("Power Supply Voltage: ");
  Serial.println(voltage);

  // Display voltage value on the LCD
  lcd.setCursor(0, 1);  // Set cursor to the second line
  lcd.print("Voltage: ");
  lcd.print(voltage);
  lcd.print("V");
}