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

// =======================
// Pin Definitions
// =======================
const int currentSensorPin = 34;  // ACS712
const int voltageSensorPin = 35;  // ZMPT101B
const int buttonPin = 2;          // Simulate RFID scan

LiquidCrystal_I2C lcd(0x27, 16, 2);  // LCD 16x2, address 0x27

// =======================
// Variables
// =======================
float current = 0.0;
float voltage = 0.0;
String rfidTag = "None";

// =======================
// Setup
// =======================
void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  
  pinMode(buttonPin, INPUT_PULLDOWN);  // push button simulate RFID
  pinMode(currentSensorPin, INPUT);
  pinMode(voltageSensorPin, INPUT);

  Serial.println("Simulation Started!");
}

// =======================
// Loop
// =======================
void loop() {
  // ----- Simulate Sensor Reading -----
  int sensorValueCurrent = analogRead(currentSensorPin);
  int sensorValueVoltage = analogRead(voltageSensorPin);
  
  // Convert ACS712 (5A version) to Amps
  current = ((sensorValueCurrent - 512) * (5.0 / 1024.0)) * 5; // rough simulation
  
  // Convert ZMPT101B analog reading to Voltage (0-250V)
  voltage = ((sensorValueVoltage / 1023.0) * 250.0);  // rough simulation
  
  // ----- Simulate RFID Scan -----
  if (digitalRead(buttonPin) == HIGH) {
    rfidTag = "RFID_001";  // simulate tag scanned
  } else {
    rfidTag = "None";
  }

  // ----- Display on LCD -----
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("V:");
  lcd.print(voltage, 1);
  lcd.print("V I:");
  lcd.print(current, 2);
  lcd.print("A");
  
  lcd.setCursor(0,1);
  lcd.print("Tag:");
  lcd.print(rfidTag);

  // ----- Simulate Sending Data -----
  Serial.print("Sending Data -> ");
  Serial.print("Voltage: "); Serial.print(voltage,1);
  Serial.print("V, Current: "); Serial.print(current,2);
  Serial.print("A, RFID: "); Serial.println(rfidTag);
  
  delay(1000); /