wifi enabled smart energy meter based on arduino that shows electrical quantites of an appliance on a web server.
| Hardware | |||
|---|---|---|---|
| 1 | Arduino UNO | ||
| 1 | Node MCU | ||
| 1 | ACS 712 | ||
| 1 | ZMPT 101 B | ||
| 1 | jumper wires | ||
| 1 | breadboard | ||
| Software | |||
|---|---|---|---|
| 1 | arduino ide | ||
INTRODUCTION:
Wifi enabled energy meter based on arduino that shows electrical quantites for any appliance on a web server.
First of all download arduino ide from https://www.arduino.cc/en/Guide/Windows if you already have downloaded then go ahead.
Libraries:
1. Emonlib - download it from https://github.com/openenergymonitor/EmonLib . Then install it in libraries folder.
2. ArduinoJSON -
Open the Arduino Library Manager
Search for “ArduinoJson”
Select the version: 5.13.5
Click install.
see video --- https://youtu.be/GUTpaY1YaXo
3.Software Serial - Arduino has a Library of Software Serial in it. If you can’t find its library then you should download the Software Serial Library. https://www.arduino.cc/en/Reference/softwareSerial
// this code is uploaded to arduino.
//Remember to install all included libraries first.
#include <EmonLib.h> // Include Emon Library
#include <SoftwareSerial.h> //This library will do serial communication b/w arduino and nodemcu.
#include<ArduinoJson.h> //This library is used to transfer data from arduino to nodemcu.
EnergyMonitor emon1; // Create an instance
SoftwareSerial s(5,6); //We named serialport as "s" in which pin 5 is RX(receiving) and pin 6 is TX(transmitting).
void setup()
{
Serial.begin(9600); //Serial monitor begin at 9600 baud rate.
s.begin(9600); //Serial Port "s" begin at 9600 baud rate.
emon1.voltage(2, 178, 1.7); // Voltage: input pin, calibration, phase_shift
emon1.current(1, 5); // Current: input pin, calibration.60
}
StaticJsonBuffer<1000> jsonBuffer; //here json is used to transmit data from arduino to nodemcu.
JsonObject& root = jsonBuffer.createObject(); //json object created to store data.
void loop()
{
emon1.calcVI(20,2000); // Calculate all. No.of wavelengths, time-out
emon1.serialprint(); // Print out all variables
emon1.calcF(50); // 50 zero crossings
float fre = emon1.frequency; // calculate frequency.
float freq = fre + 5;
Serial.print("Frequency: "); //print Frequency in serial window.
Serial.println(freq); //print value of frequency.
float real=emon1.realPower; //calculate real power/
float apparent=emon1.apparentPower; //calculate apparent power.
float sq_Ap = apparent*apparent;
float sq_Rp = real*real;
float diff_of_sq = sq_Ap - sq_Rp;
Serial.print("apparent squared: "); //print Frequency in serial window.
Serial.println(sq_Ap);
Serial.print("real squared: "); //print Frequency in serial window.
Serial.println(sq_Rp);
Serial.print("diff of sq: "); //print Frequency in serial window.
Serial.println(diff_of_sq);
float reactive=sqrt(diff_of_sq);
Serial.print("reactive: "); //print Frequency in serial window.
Serial.println(reactive);
delay(1000);
//float reactive=sqrt(diff_of_sq);
root["RP"] = emon1.realPower; //calculated real power is stored in json object "RP".
root["AP"] = emon1.apparentPower; //calculated apparent power is stored in json object "AP".
root["VRMS"] = emon1.Vrms; //calculated Vrms is stored in json object "VRMS".
root["IRMS"] = emon1.Irms; //calculated Irms is stored in json object "IRMS".
root["PF"] = emon1.powerFactor; //calculated power factor is stored in json object "PF".
root["FREQ"] = freq; //calculated frequency is stored in json object "FREQ".
root["reactive"] = reactive; //calculated reactive power is stored in json object "reactive".
if(s.available()>0) //if received anything from nodemcu through serial port then print all root objects to serial port.
{
root.printTo(s);
}
}
Connections:
For current sensing connect acs712 in series with your appliance.
Current Sensor --------------------- > Arduino
Vcc ---------------------------------> 5v
GND ---------------------------------> GND
OUT --------------------------------> A1 (this can be of any analog pin of your choice)
For Voltage Sensing connect ZMPT 101B in parallel with appliance. Connections are as follows:
voltage sensor ------------> Arduino
Vcc ---------------------> 5v
GND(both) -------------- > GND
OUT -----------------------> A2 (this can be of any analog pin of your choice)
For Serial Communication between arduino and nodemcu the connections are as follows:
Arduino ---------------- > Node MCU
5 (Rx) -------------------- > D5 (Tx)
6 (Tx) -------------------- > D6 (Rx)
