How to Use PZEM-004T V3: Examples, Pinouts, and Specs

The PZEM-004T V3 is a multifunctional energy monitoring module manufactured by Peacefair. It is designed to measure key electrical parameters in AC circuits, including voltage, current, power, energy, frequency, and power factor. The module communicates via UART (Universal Asynchronous Receiver-Transmitter), making it easy to integrate with microcontrollers and other devices for real-time energy monitoring.

This module is widely used in energy management systems, home automation, industrial monitoring, and other applications where accurate measurement of electrical parameters is essential.

Below are the key technical details of the PZEM-004T V3 module:

• Input Voltage Range: 80V to 260V AC
• Current Measurement Range: 0A to 100A (with external current transformer)
• Power Measurement Range: 0W to 22kW
• Energy Measurement Range: 0kWh to 9999kWh
• Frequency Range: 45Hz to 65Hz
• Power Factor Range: 0.00 to 1.00
• Communication Interface: UART (9600 baud rate, 8N1 format)
• Operating Temperature: -10°C to 60°C
• Dimensions: 48mm x 23mm x 22mm

The PZEM-004T V3 module has a 4-pin interface for power and communication. The pin configuration is as follows:

The module comes with an external current transformer (CT) for current measurement. The CT has a maximum current rating of 100A and is connected to the module via a dedicated port.

1. Power Supply: Connect the VCC pin to a 5V DC power source and the GND pin to ground.
2. UART Communication: Connect the RX pin of the module to the TX pin of your microcontroller (e.g., Arduino UNO) and the TX pin of the module to the RX pin of the microcontroller.
3. Current Transformer: Attach the external CT to the load wire you want to monitor. Ensure the CT is properly oriented as indicated on the device.
4. AC Voltage Input: Connect the AC voltage input terminals of the module to the live and neutral wires of the circuit you want to monitor.

• Ensure the module is powered with a stable 5V DC supply.
• The module is designed for AC circuits only and should not be used with DC circuits.
• Avoid exceeding the maximum current rating of the CT (100A) to prevent damage.
• Use proper isolation and safety precautions when working with high-voltage AC circuits.

Below is an example Arduino sketch to read data from the PZEM-004T V3 module using the SoftwareSerial library:

#include <SoftwareSerial.h>

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

// PZEM-004T V3 communication commands
byte readCommand[] = {0xB0, 0xC0, 0xA8, 0x01, 0x01, 0x00, 0x1A};

void setup() {
  Serial.begin(9600); // Initialize Serial Monitor
  pzemSerial.begin(9600); // Initialize PZEM communication
  Serial.println("PZEM-004T V3 Energy Monitor");
}

void loop() {
  // Send read command to PZEM-004T V3
  pzemSerial.write(readCommand, sizeof(readCommand));
  delay(100); // Wait for response

  // Check if data is available
  if (pzemSerial.available()) {
    Serial.print("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 next read
}

• The readCommand array contains the command to request data from the PZEM-004T V3 module.
• The response from the module will include voltage, current, power, and other parameters in a specific format. You will need to parse the response to extract meaningful data.

1. No Data Received

   • Cause: Incorrect wiring or baud rate mismatch.
   • Solution: Verify the RX and TX connections. Ensure the baud rate is set to 9600.

2. Incorrect Measurements

   • Cause: Improper connection of the current transformer (CT).
   • Solution: Ensure the CT is properly clamped around the load wire and oriented correctly.

3. Module Not Powering On

   • Cause: Insufficient or unstable power supply.
   • Solution: Use a stable 5V DC power source with sufficient current capacity.

4. Communication Errors

   • Cause: Electrical noise or long UART cable.
   • Solution: Use shorter cables and ensure proper grounding.

1. Can the PZEM-004T V3 measure DC circuits?

   • No, the module is designed for AC circuits only.

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 V3 modules with a single microcontroller?

   • Yes, you can use multiple modules by assigning unique addresses to each module and connecting them to different UART ports or using a multiplexer.

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

   • Yes, but proper isolation and safety precautions must be followed when working with high-voltage AC circuits.

By following this documentation, you can effectively integrate the PZEM-004T V3 module into your energy monitoring projects.