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

// Define the LCD (use 0x27 or change to 0x3F based on your LCD module)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Constants for voltage and current calculations
const float voltageDividerRatio = 11.0;       // Divider ratio for voltage sensor
const float currentSensorSensitivity = 0.185; // Sensitivity of ACS712 (e.g., 5A version)
const float referenceVoltage = 5.0;           // Arduino ADC reference voltage
const int adcResolution = 1024;               // ADC resolution (10-bit)

float voltage = 0.0;
float current = 0.0;
float power = 0.0;

void setup() {
  // Initialize the LCD
  lcd.begin(16, 2);        // Initialize with 16 columns and 2 rows
  lcd.backlight();         // Turn on LCD backlight

  // Display startup message
  lcd.setCursor(0, 0);
  lcd.print("Smart Energy");
  lcd.setCursor(0, 1);
  lcd.print("Meter Starting");
  delay(2000);
  lcd.clear();

  // Initialize Serial Monitor for debugging
  Serial.begin(9600);
}

void loop() {
  // Simulate voltage reading from potentiometer (connected to A0)
  int voltageRaw = analogRead(A0);
  voltage = (voltageRaw * referenceVoltage / adcResolution) * voltageDividerRatio;

  // Simulate current reading from potentiometer (connected to A1)
  int currentRaw = analogRead(A1);
  float currentVoltage = currentRaw * referenceVoltage / adcResolution;
  current = (currentVoltage - 2.5) / currentSensorSensitivity; // Assuming 2.5V is the zero-current reference

  // Display values on the LCD
  lcd.setCursor(0, 0);
  lcd.print("V:"); lcd.print(voltage, 1); lcd.print("V ");
  lcd.print("I:"); lcd.print(current, 2); lcd.print("A");
  lcd.setCursor(0, 1);


  // Debugging output on Serial Monitor
  Serial.print("Voltage: "); Serial.print(voltage, 1); Serial.println(" V");
  Serial.print("Current: "); Serial.print(current, 2); Serial.println(" A");
  
  Serial.println("-------------------");

  delay(1000); // Update every second
}