IOT METER UPDATED CODE CODE CODE CODE

 #include <Wire.h>

#include <LiquidCrystal_I2C.h>

#include "EmonLib.h"             // Include Emon Library

#include "ACS712.h"              // Include ACS712 Library

// Define LCD parameters

#define I2C_ADDR 0x27             // I2C address for the LCD

#define LCD_ROWS 2

#define LCD_COLS 16

// Create instances of the libraries

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLS, LCD_ROWS);

EnergyMonitor emon1;

ACS712 sensor(ACS712_05B, A0);

#define VOLT_CAL 592

#define RESISTOR_VALUE 1000       // Resistance value in Ohms

#define VOLTAGE_RMS_REF 230.0     // Reference RMS voltage in Volts

#define POWER_THRESHOLD 100       // Power threshold for determining "power off" state

const int samplingInterval = 1000;  // Sampling interval in milliseconds

const int displayInterval = 20000;  // Display update interval in milliseconds (20 seconds)

float currentPowerSum = 0;          // Sum of power values over the 20-second interval

int powerSampleCount = 0;           // Number of power samples in the 20-second interval

float totalEnergy = 0;              // Total energy consumption

unsigned long lastSampleTime = 0;   // Last sample time

unsigned long lastDisplayTime = 0;  // Last display update time

float lastMeasuredPower = 0;        // Last measured power value

void setup() {

  Serial.begin(9600);

  // Initialize the LCD

  lcd.init();

  // lcd.backlight(); // Uncomment if backlight control is needed

  // Initialize sensors

  emon1.voltage(1, VOLT_CAL, 1.7); // Voltage sensor initialization

  sensor.calibrate();              // Current sensor calibration

}

void loop() {

  unsigned long currentTime = millis();

  if (currentTime - lastSampleTime >= samplingInterval) {

    lastSampleTime = currentTime;

    // Voltage sensing

    emon1.calcVI(25, 1000);                    // Calculate voltage and current

    float supplyVoltage = emon1.Vrms;          // Extract Vrms into variable

    // Check if voltage is less than 100V

    if (supplyVoltage < 100.0) {

      // Set power to zero

      lastMeasuredPower = 0;

      // Send power off state to ESP32 module

      Serial.println("POWER_OFF");

    } else {

      // Current sensing

      float current = sensor.getCurrentAC();     // Read current

      // Power calculation

      lastMeasuredPower = supplyVoltage * current; // Power in Watts (P = VI)

      // Send power value to ESP32 module

      Serial.print("POWER_VALUE:");

      Serial.println(lastMeasuredPower);

    }

    // Add power to the current power sum

    currentPowerSum += lastMeasuredPower;

    powerSampleCount++;

    // Check if 20 seconds have passed

    if (currentTime - lastDisplayTime >= displayInterval) {

      // Calculate average power over the last 20 seconds

      float averagePower = currentPowerSum / powerSampleCount;

      // Print the average power

      Serial.print("Average Power: ");

      Serial.print(averagePower);

      Serial.println(" W");

      // Update the LCD display

      lcd.clear();

      lcd.setCursor(0, 0);

      if (lastMeasuredPower == 0) {

        lcd.print("Power: OFF");

      } else {

        lcd.print("Power: ");

        lcd.print(averagePower, 2);

        lcd.print(" W");

      }

      // Update total energy consumption (in Watt-hours)

      totalEnergy += (averagePower * (displayInterval / 1000.0)) / 3600.0;

      // Display total energy consumption on the second line

      lcd.setCursor(0, 1);

      lcd.print("Energy: ");

      lcd.print(totalEnergy, 2);

      lcd.print(" Wh");

      // Reset power sum and count for the next interval

      currentPowerSum = 0;

      powerSampleCount = 0;

      lastDisplayTime = currentTime;

    }

  }

}