EXISTING IOT ENERGY METER FOR DISPLAYING POWER

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

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

#define VOLT_CAL 592

#define RESISTOR_VALUE 1000      // Resistance value in Ohms

#define VOLTAGE_RMS_REF 230.0    // Reference RMS voltage in Volts (typically 230V for mains)

EnergyMonitor emon1;             // Create an instance of EnergyMonitor

ACS712 sensor(ACS712_05B, A0);   // Create an instance of ACS712

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

const int numSamples = 3600;        // Number of samples to store (3600 samples = 1 hour)

float voltageSamples[numSamples];   // Array to store voltage samples

int sampleIndex = 0;                 // Index to keep track of the current sample

float prevVoltage = 0;               // Variable to store the previous voltage value

float prevPowerSum = 0;              // Variable to store the sum of all previous power values

void setup() {

  Serial.begin(9600);

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

  sensor.calibrate();               // Current sensor calibration

}

void loop() {

  // Voltage sensing

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

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

 

  // Current sensing

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

 

  // Power calculation

  float power = (supplyVoltage * current) / 1000; // Power in Watts (P = VI / 1000)

 

  // Energy calculation

  if (supplyVoltage >= 100) {

    // Store the voltage value

    voltageSamples[sampleIndex] = supplyVoltage;

    // Increment sampleIndex and loop back if necessary

    sampleIndex = (sampleIndex + 1) % numSamples;

   

    // Add current power to the sum of all previous power values

    prevPowerSum += power;

   

    // Print the sum of all previous power values

    Serial.print("Sum of all previous power values: ");

    Serial.print(prevPowerSum);

    Serial.println("W");

  } else {

    Serial.println("Power OFF");

  }

 

  // Wait for the sampling interval

  delay(samplingInterval);

}