How to Use pzem-004t: Examples, Pinouts, and Specs

Introduction

The PZEM-004T is a digital power meter designed for monitoring and measuring key electrical parameters in AC circuits. It provides real-time data on voltage, current, power, energy consumption, and frequency. This module communicates via UART (Universal Asynchronous Receiver-Transmitter), making it easy to integrate with microcontrollers such as the Arduino UNO.

Explore Projects Built with pzem-004t

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!

ESP32-Based Smart Environmental Monitoring System with Relay Control

This is a smart environmental monitoring and control system featuring an ESP32 microcontroller interfaced with a PZEM004T for power monitoring, relay modules for actuating bulbs and a fan, and an LCD for user interface. It includes flame, gas, and vibration sensors for safety monitoring purposes.

Open Project in Cirkit Designer

ESP32-Controlled AC Lighting System with Power Monitoring

This circuit features an ESP32 microcontroller interfaced with a PZEM004T power monitoring module and a 4-channel relay module controlling multiple AC LED bulbs. The ESP32 uses GPIO pins to control the relays, which in turn switch the LED bulbs on and off. The PZEM004T is connected to the ESP32 for communication and to a current sensor for monitoring power consumption of the connected load through the relay contacts.

Open Project in Cirkit Designer

ESP8266 NodeMCU Based Energy Monitoring Display with PZEM004T and OLED Screen

This circuit is designed to monitor electrical parameters using the PZEM004t sensor and display the data on a 0.96" OLED screen. The esp8266 nodemcu serves as the central controller, interfacing with the PZEM004t sensor via serial communication (RX/TX) and with the OLED display through an I2C connection (SCK/SDA). A 5V adapter provides power to the circuit, with the nodemcu regulating down to 3.3V for the OLED display and the PZEM004t sensor receiving 5V directly.

Open Project in Cirkit Designer

ESP32-Based Smart Power Monitoring and Control System with Wi-Fi Connectivity

This circuit is a smart power monitoring and control system using an ESP32 microcontroller. It features multiple sensors and components, including PZEM-004T AC modules for voltage and current measurement, DS18B20 temperature sensors, an LCD for display, and solid-state relays for controlling power outlets. The system is integrated with Blynk for remote monitoring and control, and includes pushbuttons for local interaction.

Open Project in Cirkit Designer

Common Applications and Use Cases

• Home energy monitoring systems
• Industrial power management
• Smart IoT-based energy solutions
• Electrical load analysis
• Renewable energy systems (e.g., solar or wind power monitoring)

Technical Specifications

The following table outlines the key technical details of the PZEM-004T module:

Pin Configuration and Descriptions

The PZEM-004T module has the following pinout:

Note: Ensure proper isolation and safety precautions when connecting the module to AC mains.

Usage Instructions

How to Use the PZEM-004T in a Circuit

1. Power the Module: Connect the VCC and GND pins of the PZEM-004T to a 5V DC power source.
2. Connect UART Pins:
   • Connect the TX pin of the PZEM-004T to the RX pin of the Arduino UNO.
   • Connect the RX pin of the PZEM-004T to the TX pin of the Arduino UNO.
3. AC Input Connection:
   • Connect the live and neutral wires of the AC circuit to the module's AC input terminals.
   • Use the included current transformer (CT) to measure current by clamping it around the live wire.
4. Load the Arduino Code: Use the provided Arduino code to read data from the PZEM-004T.

Important Considerations and Best Practices

• Safety First: The PZEM-004T is connected to high-voltage AC circuits. Ensure proper insulation and avoid direct contact with live wires.
• Current Transformer Placement: The CT should only clamp around the live wire, not both live and neutral wires.
• Baud Rate: The module communicates at a fixed baud rate of 9600. Ensure your microcontroller is configured accordingly.
• Power Supply: Use a stable 5V DC power source to avoid communication errors or inaccurate readings.

Example Arduino Code

Below is an example Arduino sketch to interface the PZEM-004T with an Arduino UNO:

#include <SoftwareSerial.h>

// Define RX and TX pins for SoftwareSerial
SoftwareSerial pzemSerial(10, 11); // RX = Pin 10, TX = Pin 11

// PZEM-004T communication commands
byte readCommand[] = {0xB0, 0xC0, 0xA8, 0x01, 0x01, 0x00, 0x1A};

// Function to send a command to the PZEM-004T
void sendCommand(byte *command, int length) {
  for (int i = 0; i < length; i++) {
    pzemSerial.write(command[i]);
  }
}

void setup() {
  Serial.begin(9600);          // Initialize Serial Monitor
  pzemSerial.begin(9600);      // Initialize SoftwareSerial for PZEM-004T
  delay(100);                  // Allow time for initialization
}

void loop() {
  sendCommand(readCommand, sizeof(readCommand)); // Send read command
  delay(100);                                    // Wait for response

  // Check if data is available from the PZEM-004T
  if (pzemSerial.available()) {
    Serial.println("Data received:");
    while (pzemSerial.available()) {
      byte data = pzemSerial.read();
      Serial.print(data, HEX); // Print data in hexadecimal format
      Serial.print(" ");
    }
    Serial.println();
  } else {
    Serial.println("No data received.");
  }

  delay(1000); // Wait 1 second before the next read
}

Note: This code demonstrates basic communication with the PZEM-004T. For advanced functionality, consider using a dedicated library such as the PZEM004T library available in the Arduino IDE Library Manager.

Troubleshooting and FAQs

Common Issues and Solutions

FAQs

1. Can the PZEM-004T measure DC circuits?

   • No, the PZEM-004T is designed specifically for AC circuits.

2. What is the maximum current the module can measure?

   • The module can measure up to 100A using the included current transformer.

3. Can I use multiple PZEM-004T modules with one Arduino?

   • Yes, but you will need to assign unique addresses to each module and use a multiplexer or additional UART ports.

4. Is the module safe to use with high-voltage circuits?

   • Yes, but always follow proper safety precautions and ensure adequate insulation.

By following this documentation, you can effectively integrate the PZEM-004T into your energy monitoring projects.