// Emon (Energy Monitor) Library
#include "EmonLib.h"

// CONSTANTS
// Anslog current senson is connected to GPIO 34 (Analog ADC1_CH6)
const int currentPin = 34;
// Standart RMS voltage
const double Vrms = 220.0;
// Current sensor calibration, iCalibration is the current that gives 1V at the ADC input
const double iCalibration = 111.1;
// Number of current samples
const int iSamples = 1480;

// INITIALIZATION
// EnergyMonitor instance
EnergyMonitor energyMonitor;
// variable for storing the RMS current value
double Irms = 0.0;
// variable for storing the RMS Power usage
double Prms = 0.0;

void setup() {
  // Setup code here, run once
  Serial.begin(9600);
  // Setup EnergyMonitor
  energyMonitor.current(currentPin, iCalibration);
}

void loop() {
  // main code here, run repeatedly
  
  // Calculate RMS current
  Irms = energyMonitor.calcIrms(iSamples);
  // Calculate RMS Power usage
  Prms = Irms*Vrms;

  Serial.print("Instant power usage: ");
  Serial.print(Prms);
  Serial.println(" W");
  // Update delay
  delay(100);
}