How to Use PZEM004t: Examples, Pinouts, and Specs

The PZEM004T is a versatile and highly accurate digital power meter designed to measure various electrical parameters including voltage, current, power, energy, and frequency. It is widely used in monitoring energy consumption for household appliances, industrial machinery, and various electronic projects. Its ability to interface with microcontrollers like the Arduino UNO makes it a popular choice for DIY enthusiasts and professionals looking to build energy monitoring systems.

• Home energy monitoring systems
• Industrial power management
• Renewable energy systems (solar, wind, etc.)
• Laboratory instruments for electrical measurements
• IoT devices for smart energy solutions

• Voltage Measurement Range: 80 - 260V AC
• Current Measurement Range: 0 - 100A (with appropriate current transformer)
• Power Measurement Range: 0 - 22kW
• Energy Measurement Range: 0 - 9999kWh
• Frequency Measurement Range: 45 - 65Hz
• Measurement Accuracy: 1.0%

1. Power Supply: Connect the VCC pin to a 5V power source and the GND pin to the common ground.
2. Current Transformer: Attach the current transformer around the live wire of the circuit you wish to measure.
3. Voltage Measurement: Connect the voltage measurement terminals of the PZEM004T across the points in the circuit where you want to measure the voltage.
4. Data Communication: Connect the RX and TX pins to a microcontroller or a computer to read the data from the PZEM004T.

• Ensure that the power supply to the PZEM004T does not exceed 5V DC.
• Always disconnect the power before making any connections to avoid electric shock.
• Use appropriate gauge wires for connections, especially for high current applications.
• Do not exceed the maximum ratings of voltage and current specified by the manufacturer.
• When using with a microcontroller, ensure proper level shifting if required (e.g., when using a 3.3V logic level microcontroller).

• No Data Output: Check connections to the RX and TX pins, and ensure the power supply is stable.
• Inaccurate Readings: Verify that the current transformer is properly installed and that there are no loose connections.
• Device Not Powering Up: Ensure that the VCC and GND connections are correct and that the power supply is within the specified range.

• Double-check wiring and solder joints for any potential issues.
• Use a multimeter to verify the voltage at the VCC pin.
• Ensure that the serial communication baud rate matches the PZEM004T's default baud rate.

Q: Can the PZEM004T be used with an Arduino UNO? A: Yes, the PZEM004T can be easily connected to an Arduino UNO for data logging and monitoring.

Q: What is the default baud rate for the PZEM004T? A: The default baud rate for serial communication with the PZEM004T is 9600 bps.

Q: How can I reset the energy data on the PZEM004T? A: Energy data can be reset through a command sent from the microcontroller to the PZEM004T.

#include <SoftwareSerial.h> // Include the SoftwareSerial library

// PZEM004T connection pins
#define PZEM_RX 6
#define PZEM_TX 7

// Create a SoftwareSerial object
SoftwareSerial pzem(PZEM_RX, PZEM_TX);

void setup() {
  Serial.begin(9600); // Start the Serial communication
  pzem.begin(9600);  // Start the PZEM communication
}

void loop() {
  // Send request for data to PZEM004T
  pzem.write(0xB0);
  pzem.write(0xC0);
  pzem.write(0xA8);
  pzem.write(0x01);
  pzem.write(0x01);
  pzem.write(0x00);
  pzem.write(0x1E);

  // Wait for a response
  delay(1000);

  // Read the response and print it to the Serial Monitor
  if (pzem.available()) {
    Serial.print("Voltage: ");
    Serial.print(pzem.read()); // Read voltage
    Serial.println("V");

    // Repeat for current, power, energy, and frequency
    // ...
  }
}

Note: This example code is for demonstration purposes only and may require additional commands and error checking for practical applications. Always refer to the PZEM004T datasheet for detailed communication protocol information.