#define BLYNK_TEMPLATE_ID "TMPL6r-sgG6Jr"
#define BLYNK_TEMPLATE_NAME "ENERGY METER"
#define BLYNK_AUTH_TOKEN "d4TkH2lr6kHvIgNEfmsxpFPIoqymWpw9"

#include <BlynkSimpleEsp32.h>
#include <WiFi.h>
#include <Wire.h>  // Include the Wire library for I2C communication
#include <LiquidCrystal_I2C.h>  // Include the I2C LCD library

LiquidCrystal_I2C lcd(0x27, 16, 2);  // Set the LCD address and size

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const int voltagePin = 36; // Analog input pin for voltage measurement
const int currentPin = 39; // Analog input pin for current measurement

float voltage, current, power;

BlynkTimer timer;

void setup() {
  Serial.begin(115200);
  lcd.init();  // Initialize the LCD
  lcd.backlight();  // Turn on the backlight

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, password);

  pinMode(voltagePin, INPUT);
  pinMode(currentPin, INPUT);

  timer.setInterval(1000L, sendDataToBlynk); // Send data to Blynk every 1 second
}

void loop() {
  Blynk.run();
  timer.run();
}

void sendDataToBlynk() {
  int rawVoltage = analogRead(voltagePin);
  int rawCurrent = analogRead(currentPin);
  
  voltage = rawVoltage / 4095.0 * 3.3; // Convert ADC value to voltage (assuming 3.3V reference)
  current = rawCurrent / 4095.0 * 3.3; // Convert ADC value to current (assuming 3.3V reference)
  
  // Calculate power using P = VI
  power = voltage * current;

  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.print(" V, Current: ");
  Serial.print(current);
  Serial.print(" A, Power: ");
  Serial.print(power);
  Serial.println(" W");

  Blynk.virtualWrite(V0, voltage); // Send voltage value to Blynk's virtual pin V0
  Blynk.virtualWrite(V1, current); // Send current value to Blynk's virtual pin V1
  Blynk.virtualWrite(V2, power);   // Send power value to Blynk's virtual pin V2

  // Display values on the LCD
  lcd.clear();  // Clear the LCD screen
  lcd.setCursor(0, 0);  // Set the cursor to the first line
  lcd.print("Voltage: ");
  lcd.print(voltage);
  lcd.print(" V");

  lcd.setCursor(0, 1);  // Set the cursor to the second line
  lcd.print("Current: ");
  lcd.print(current);
  lcd.print(" A");
}