Power Monitoring using Arduino Uno

In this simple project we are going to build a simple real time power monitoring circuit to measure a 3-phase household usage. the design is very simple consists of the below 

1- Arduino Uno 

2- DHT22 (Temperature and Humidity Monitoring)

3- None-Invasive Current sensors SCT-013-060 (60 Amp)

4- LCD 128x46

5- Resistors and Capacitors

6- Jumper wires

the Arduino will be loaded with the energy monitoring package that can be found the libraries (EmonLib.h) this package will calculate and provide the current and voltage per phase and the DHT22 will provide information about the temperature and humidity for the sounding environment where you place the sensor

we create simple visualization on the LCD with lines and boxes to show real time readings for the voltage, current and kW consumption per phase and total of all the phases 

the project can be enhanced more by sending data to an external data warehouse to be collected, analyzed and visualized

as for the code, please check the below 

#include <Arduino.h>
#include <U8g2lib.h>
#include "EmonLib.h"
#include "DHT.h"

#define DHTPIN 2
#define DHTTYPE DHT22

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif
#


/*
 * SPI    Serial Peripheral Interface
 *  https://www.arduino.cc/en/Reference/SPI 
 * 
 * PINS 128x64 DOT MATRIX / GRAPHIC DISPLAY
 * ST7920 LCD controller
 *
 * BLK    Backlight -
 * BLA    Backlight +
 * VOUT
 * RST    RST
 * NC     Not Connected
 * PSB    Interface Secelection LOW = Serial / HIGH = Parallel
 * DB7    Data Bit 7
 * DB6    Data Bit 6
 * DB5    Data Bit 5
 * DB4    Data Bit 4
 * DB3    Data Bit 3
 * DB2    Data Bit 2
 * DB1    Data Bit 1
 * DB0    Data Bit 0
 * E      Enable trigger (serial clock SCK)
 * R/W    Read / Write (Master Out Slave In MOSI)
 * RS     Register Select (chip select CS)
 * V0     LCD Constrast
 * VCC    Voltage Common Connector
 * GND    Ground
 * 
 * 
 * PIN CONNECTIONS: 
 * 
 * BLK        GND
 * BLA        3.3V
 * PSB        GND
 * E (SCK)    13
 * RW (MOSI)  11
 * RS (CS)    10
 * 
 * VCC        5V
 * GND        GND
 * 
 */

U8G2_ST7920_128X64_1_SW_SPI u8g2(U8G2_R2, /* clock=*/ 13, /* data=*/ 11, /* CS=*/ 10, /* reset=*/ 8);
EnergyMonitor emon1;             // Create an instance-1
EnergyMonitor emon2;             // Create an instance-2
EnergyMonitor emon3;             // Create an instance-3
DHT dht(DHTPIN, DHTTYPE);

  int valVrms1 = 0;  
  float valIrms1 = 0;
  float valIrms2 = 0;
  float valIrms3 = 0;
  int valKW1 = 0;
  int valKW2 = 0;
  int valKW3 = 0; 
  int valKWtotal = 0; 
  int h = 0;
  int t = 0;


void setup(void) {
  
u8g2.begin();
Serial.begin(9600);
emon1.current(1, 27);       // Ph-1Current: input pin, calibration.
emon2.current(3, 48);       // Ph-2Current: input pin, calibration.
emon3.current(4, 45);       // Ph-3Current: input pin, calibration.
emon1.voltage(2, 140, 1.7);  // Voltage: input pin, calibration, phase_shift 
dht.begin();
}



void screen (void){   

u8g2.setFont(u8g2_font_5x8_tf);
  
// Set the Voltage frame and value

  u8g2.drawFrame(1,1,39,10);
  u8g2.setCursor(3, 9);
  u8g2.print("Vol");
  u8g2.setCursor(18, 9);
  u8g2.print(":");
  u8g2.setCursor(24, 9);
  u8g2.print(valVrms1);

// Set the Temp frame and value

  u8g2.drawFrame(44,1,39,10);
  u8g2.setCursor(45, 9);
  u8g2.print("Tem");
  u8g2.setCursor(61, 9);
  u8g2.print(":");
  u8g2.setCursor(66, 9);
  u8g2.print(t);
  u8g2.setCursor(76, 9);
  u8g2.print("c");
 

// Set the humidity frame and value

  u8g2.drawFrame(87,1,39,10);
  u8g2.setCursor(89, 9);
  u8g2.print("Hum");
  u8g2.setCursor(105, 9);
  u8g2.print(":");
  u8g2.setCursor(110, 9);
  u8g2.print(h);
  u8g2.setCursor(120, 10);
  u8g2.print("%");


// Set the Phase-1 frame

  u8g2.drawFrame(1,13,39,10);
  u8g2.setCursor(3, 21);
  u8g2.print("Phase-1");

// Set the Phase-1 AMP

  u8g2.drawFrame(44,13,39,10);
  u8g2.setCursor(45, 21);
  u8g2.print(valIrms1);
  u8g2.setCursor(70, 21);
  u8g2.print("A");

// Set the Phase-1 KWA

  u8g2.drawFrame(87,13,39,10);
  u8g2.setCursor(89, 21);
  u8g2.print(valKW1);
  u8g2.setCursor(115, 21);
  u8g2.print("W");

// Set the Phase-2 frame

  u8g2.drawFrame(1,25,39,10);
  u8g2.setCursor(3, 33);
  u8g2.print("Phase-2");

// Set the Phase-2 AMP

  u8g2.drawFrame(44,25,39,10);
  u8g2.setCursor(45, 33);
  u8g2.print(valIrms2);
  u8g2.setCursor(70, 33);
  u8g2.print("A");

// Set the Phase-2 KWA

  u8g2.drawFrame(87,25,39,10);
  u8g2.setCursor(89, 33);
  u8g2.print(valKW2);
  u8g2.setCursor(115, 33);
  u8g2.print("W");

// Set the Phase-3 frame

  u8g2.drawFrame(1,37,39,10);
  u8g2.setCursor(3, 45);
  u8g2.print("Phase-3");

// Set the Phase-3 AMP

  u8g2.drawFrame(44,37,39,10);
  u8g2.setCursor(45, 45);
  u8g2.print(valIrms3);
  u8g2.setCursor(70, 45);
  u8g2.print("A");

// Set the Phase-3 KWA

  u8g2.drawFrame(87,37,39,10);
  u8g2.setCursor(89, 45);
  u8g2.print(valKW3);
  u8g2.setCursor(115, 45);
  u8g2.print("W");

// Print Total KW for the 3 phases

u8g2.setFont(u8g2_font_courR12_tf);
u8g2.setCursor (2, 60);
u8g2.print("T-W");
u8g2.setCursor (50,60);
u8g2.print(valKWtotal);

}

void loop(void) { 

  emon1.calcVI(20,2000);
  valVrms1 = emon1.Vrms;  
  valIrms1 = emon1.calcIrms(1480);
  valIrms2 = emon2.calcIrms(1480);
  valIrms3 = emon3.calcIrms(1480);
  valKW1 = valIrms1*valVrms1; 
  valKW2 = valIrms2*valVrms1;
  valKW3 = valIrms3*valVrms1; 
  valKWtotal = valKW1+valKW2+valKW3;
  h = dht.readHumidity();
  t = dht.readTemperature();
  
u8g2.firstPage();
do {  
screen();
} while ( u8g2.nextPage() );

//Serial.print(valVrms1);
//Serial.print(" , ");
//Serial.print(valIrms1*220);
//Serial.print('\n');
//float h = dht.readHumidity();
//float t = dht.readTemperature();
//Serial.print("Humidity: "); 
//Serial.print(h);
//Serial.print(" %\t");
//Serial.print("Temperature: "); 
//Serial.print(t);
//Serial.print(" *C ");
//Serial.print('\n');

}

please feel free to comment, share this and add additional lines to enhance this project in a way that all can benefit from it 

if you are looking to the materials that used to build this project, you can find it below 

LCD

Arduino UNO

DHT22

Current Sensor