PZEM-004T V3 Module | Arduino & NodeMCU Code, Circuit, Pinout and Library

InnovatorsGuru

5 years ago

PZEM-004T V3

In many electrical projects, engineer directly deals with measurements with few basic requirements like.

High galvanic isolation
Parameter display
Direct communication with computer
Data acquisition and storage with subsequent viewing or copying to the computer.

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PZEM-004T V3.0 or Version 3.0 is the upgraded version to replace the old PZEM004T V1.0. The old version has been sold out in most of the online store and no produce anymore. The updated version of PZEM004T is best for the DIY project, where we need to measure the voltage, current, power, energy, frequency, Power factor (frequency and PF is extra added in the new version) using Arduino/ESP8266/Raspberry Pi like open-source platform.

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This module comes with 3 different current measurement options

10A range with a built-in Shunt resistor
100A external closed Current Transformer
100A external split current Transformer

I recommend the shell protected split current transformer module for a project like Portable AC energy meter, Energy meter for electrical Lab, Energy auditing and measuring equipment etc. as split current Transformer is more flexible than closed one. Closed CT is a low-cost option suitable for fixed type projects like Residential Energy management system, Load control system, IoT based smart Energy meter, etc.

1. 10A range with a built-in Shunt resistor

2. 100A external closed Current Transformer

3. 100A external split current Transformer

The physical dimensions of the PZEM-004T v3 board is 3.01×7.3 cm, The pzem-004t V3 module is bundled with 33mm diameter 100A current transformer coil.

The new version has higher precision, faster refresh speed, and more stability communication than the old version.

Voltage

Measuring range:80～260V
Resolution: 0.1V
Measurement accuracy: 0.5%

Power factor

Measuring range: 0.00～1.00
Resolution: 0.01
Measurement accuracy: 1%

Frequency

Measuring range: 45Hz～65Hz
Resolution: 0.1Hz
Measurement accuracy: 0.5%

Current

Measuring range: 0～10A(PZEM-004T-10A); 0～100A(PZEM-004T-100A)
Starting measure current: 0.01A(PZEM-004T-10A); 0.02A(PZEM-004T-100A)
Resolution: 0.001A
Measurement accuracy: 0.5%

Active power

Measuring range: 0～2.3kW(PZEM-004T-10A); 0～23kW(PZEM-004T-100A)
Starting measure power: 0.4W
Resolution: 0.1W
Display format:

＜1000W, it displays one decimal, such as: 999.9W

≥1000W, it display only integer, such as: 1000W
Measurement accuracy: 0.5%

Active Energy

Measuring range: 0～9999.99kWh
Resolution: 1Wh
Measurement accuracy: 0.5%
Display format:

＜10kWh, the display unit is Wh(1kWh=1000Wh), such as: 9999Wh

≥10kWh, the display unit is kWh, such as: 9999.99kWh

Function Description in short

Download links

DataSheet PZEM-004T

Download the Datasheet of PZEM-004T Modules. In datasheet detailed specifications and interfacing details are avilable.

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PZEM-004T Arduino Library

PZEM-004T Library for Arduino IDE

Get from github.com

PZEM-004T Windows Software

Windows Software for PZEM004T Module Testing

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Arduino PZEM004T V3 Interfacing

PZEM-004T Arduino Wiring Diagram

PZEM-004T V3 module has passive serial communication to connect Arduino Uno. Its RX and TX pin needs an external power supply. Connect the 5V pin to Arduino 5V pin, Rx pin to D11 of Arduino and Tx pin to D12 pin of Arduino, GND to GND. In the below diagram, PZEM004T V3 is connected to Arduino using Software serial. Use the following Program to test the module. Before compile download and install the PZEM-004T V3 library.

PZEM004T Arduino Code

This pzem004t Arduino code enable you to measure AC voltage, AC current, Power, Energy, Frequency and Power Factor on serial interface with arduino microcontroller. The library of PZEM-004t V30 works on hardware serial as well as software serial. The result of all parameters are printed on serial monitor of Arduino IDE. I tested this library code with arduino uno, arduino mega,and nano board.

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#include <PZEM004Tv30.h>
PZEM004Tv30 pzem(11, 12);
void setup() {
Serial.begin(115200);
}
void loop() {
float voltage = pzem.voltage();
if(voltage != NAN){
Serial.print(“Voltage: “); Serial.print(voltage); Serial.println(“V”);
} else {
Serial.println(“Error reading voltage”);
}
float current = pzem.current();
if(current != NAN){
Serial.print(“Current: “); Serial.print(current); Serial.println(“A”);
} else {
Serial.println(“Error reading current”);
}
float power = pzem.power();
if(current != NAN){
Serial.print(“Power: “); Serial.print(power); Serial.println(“W”);
} else {
Serial.println(“Error reading power”);
}
float energy = pzem.energy();
if(current != NAN){
Serial.print(“Energy: “); Serial.print(energy,3); Serial.println(“kWh”);
} else {
Serial.println(“Error reading energy”);
}
float frequency = pzem.frequency();
if(current != NAN){
Serial.print(“Frequency: “); Serial.print(frequency, 1); Serial.println(“Hz”);
} else {
Serial.println(“Error reading frequency”);
}
float pf = pzem.pf();
if(current != NAN){
Serial.print(“PF: “); Serial.println(pf);
} else {
Serial.println(“Error reading power factor”);
}
Serial.println();
delay(2000);
}

NodeMCU/Wemos D1 PZEM004T V3 Connection Diagram

PZEM-004T Wemos d1 mini Wiring Diagram

PZEM-004T V3 NodeMCU Wiring Diagram

PZEM-004T V3 module serial communication to connect NodeMCU or Wemos. (Connection is same for ESP8266 NodeMCU) Its RX and TX communication pin needs external 5V power. Connect the 5V pin of Wemos D1 mini to PZEM004T 5V pin, Rx pin to D6 of arduino and Tx pin to D5 pin of Wemos, gnd to gnd. In the below diagram, we connect PZEM004T V3 to Wemos D1 Mini using Software serial. Use the program to test the module. Before compile, download and install the library.

Note: PZEM-004T V3 and ESP8266 NodeMCU are communication works on different voltage level theoretically but in practical life 3.3V nodemcu pins have tolerance of 5V. VU pin is USB 5V pin (only works when NodeMCU powered through USB)

PZEM-004T ESP8266 (NodeMCU) Code

This pzem-004t NodeMCU ( ESP8266 based development board ) code allows you to measure voltage, current, Kw, kwh, Frequency and PF display data on the Blynk app. The purpose of this code is to learn to connect PZEM-004T v3.0 to NodeMCU or Wemos Mini D1.

For complete code and explanations

Visit community.blynk
GitHub Resources

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#include <ArduinoOTA.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
#include <ModbusMaster.h>
#include <ESP8266WiFi.h>
#include "settingsPZEM.h"
#include <SoftwareSerial.h> // ( NODEMCU ESP8266 )
SoftwareSerial pzem(D5,D6); // (RX,TX) connect to TX,RX of PZEM for NodeMCU
//SoftwareSerial pzem(D7,D8); // (RX,TX) connect to TX,RX of PZEM
#include <ModbusMaster.h>
ModbusMaster node;
SimpleTimer timer;
//WiFi data
char ssid[] = "Put your WiFi SSID here"; //WiFi Credential
char pass[] = "Put your WiFi password here"; //WiFi Password
char server[] = "Put your Blynk local server IP address here"; //Blynk local server IP address
int port = 8080; //Blynk local port
#define USE_LOCAL_SERVER //Use local Blynk Server - comment-out if use Blynk hosted cloud service
#define AUTH "put your Blynk App Authorization code here" //PZEM-004v3 Auth code for Blynk Local Server
int timerTask1;
double U_PR, I_PR, P_PR, PPR, PR_F, PR_PF, PR_alarm;
uint8_t result; uint16_t data[6];
void setup(){
Serial.begin(115200); Serial.println("Start serial"); pzem.begin(9600); Serial.println("Start PZEM serial");
node.begin(1, pzem); Serial.println("Start PZEM"); // 1 = ID MODBUS
WiFi.mode(WIFI_STA);
#if defined(USE_LOCAL_SERVER)
WiFi.begin(ssid, pass);
Blynk.config(AUTH, server, port);
#else
Blynk.begin(AUTH, ssid, pass);
#endif
while (Blynk.connect() == false) {}
ArduinoOTA.setHostname(OTA_HOSTNAME);
ArduinoOTA.begin();
// timerTask1 = timer.setInterval(1000, updateBlynk);
}
void updateBlynk() {
Blynk.virtualWrite(vPIN_VOLTAGE, U_PR);
Blynk.virtualWrite(vPIN_CURRENT_USAGE, I_PR);
Blynk.virtualWrite(vPIN_ACTIVE_POWER, P_PR);
Blynk.virtualWrite(vPIN_ACTIVE_ENERGY, PPR);
Blynk.virtualWrite(vPIN_FREQUENCY, PR_F);
Blynk.virtualWrite(vPIN_POWER_FACTOR, PR_PF);
Blynk.virtualWrite(vPIN_OVER_POWER_ALARM, PR_alarm);
}
void loop(){
Blynk.run();
//ArduinoOTA.handle();
//timer.run();
result = node.readInputRegisters(0x0000, 10);
if (result == node.ku8MBSuccess) {
U_PR = (node.getResponseBuffer(0x00)/10.0f);
I_PR = (node.getResponseBuffer(0x01)/1000.000f);
P_PR = (node.getResponseBuffer(0x03)/10.0f);
PPR = (node.getResponseBuffer(0x05)/1000.0f);
PR_F = (node.getResponseBuffer(0x07)/10.0f);
PR_PF = (node.getResponseBuffer(0x08)/100.0f);
PR_alarm = (node.getResponseBuffer(0x09));
}
Serial.print("U_PR: "); Serial.println(U_PR); // V
Serial.print("I_PR: "); Serial.println(I_PR,3); // A
Serial.print("P_PR: "); Serial.println(P_PR); // W
Serial.print("PPR: "); Serial.println(PPR,3); // kWh
Serial.print("PR_F: "); Serial.println(PR_F); // Hz
Serial.print("PR_PF: "); Serial.println(PR_PF);
Serial.print("PR_alarm: "); Serial.println(PR_alarm,0);
Serial.println("====================================================");
updateBlynk();
delay(1000);
}

Conclusion

As you can see, having a such low-cost module you can design best DIY Projects for your academics, Hobby or personal use etc. Remember to be safe while working on it as it comes with high voltage AC supply. As given in this guide, different projects will determine how you will use this energy meter module.

I hope you have found some useful tips in this article to carry out your electronics projects. I would love and appreciate your suggestions on how you feel we can improve this article upon. If you have gained a few tips from this article and it has helped you in any way, be generous to share it with others.

Project Applications

IOT based Smart Energy Meter

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fcgdam/PowerMeter: ESP8266 and PZEM-004T based Power Meter (github.com)
ESP8266-PZEM004T : A WiFi enabled PowerMeter for AC energy monitoring. Simple and elegant Web-Interface implementations, a RESTful API, OpenHAB 1 & 2 Callbacks and a MQTT client.

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