//https://www.pcbway.com/blog/technology/High_Precision_Digital_AC_Energy_Meter_Circuit_Voltage_Current_Power_KWh_3a6bf090.html
#include "HLW8032.h"
#include <LiquidCrystal.h>
#define SYNC_TIME 500


const int rs = 12, en = 11, d4 = 10, d5 = 9, d6 = 8, d7 = 7;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);


static unsigned long start_time, end_time;
HLW8032 HL;


void setup()
{
  lcd.begin(20, 4);
  HL.begin(Serial, 4);
  start_time = millis();
}

void loop()
{


  end_time = millis();
  HL.SerialReadLoop();


  if (end_time - start_time > SYNC_TIME)
  {
    if (HL.SerialRead == 1)
    {
      lcd.setCursor(0, 0);
      lcd.print("Voltage[V]: ");
      lcd.setCursor(12, 0);
      lcd.print(HL.GetVol() * 0.001, 2);


      lcd.setCursor(0, 1);
      lcd.print("Current[A]: ");
      lcd.setCursor(12, 1);
      lcd.print(HL.GetCurrent(), 2);


      lcd.setCursor(0, 2);
      lcd.print("Power[W]: ");
      lcd.setCursor(10, 2);
      lcd.print(HL.GetActivePower() * 0.001, 2);


      lcd.setCursor(0, 3);
      lcd.print("Energy[KWh]: ");
      lcd.setCursor(13, 3);
      lcd.print(HL.GetKWh(), 2);
    }
    start_time = end_time;
  }
}