How to Use CT PZEM004T: Examples, Pinouts, and Specs

The CT PZEM-004T is a versatile and widely-used electronic component designed for measuring electrical parameters such as voltage, current, power, and energy. It is particularly popular in applications involving energy monitoring, smart metering, and home automation systems. The PZEM-004T is often used in conjunction with microcontrollers like the Arduino UNO to provide real-time data on electrical consumption.

1. Power Supply: Connect the VCC pin to a 3.3V or 5V power supply and the GND pin to the ground.
2. Serial Communication: Connect the RX pin to the TX pin of the microcontroller and the TX pin to the RX pin of the microcontroller.
3. Current Transformer: Connect the A and B pins to the current transformer (CT) to measure the current.

• Ensure that the voltage and current ratings are within the specified range to avoid damage.
• Use proper isolation techniques when dealing with high voltage AC circuits.
• Calibrate the sensor for accurate measurements.
• Use appropriate pull-up or pull-down resistors if required by your microcontroller.

#include <SoftwareSerial.h>

// Create a software serial object to communicate with PZEM-004T
SoftwareSerial pzem(10, 11); // RX, TX

void setup() {
  Serial.begin(9600); // Initialize serial communication with the computer
  pzem.begin(9600);   // Initialize serial communication with PZEM-004T
}

void loop() {
  // Request data from PZEM-004T
  pzem.write(0xB0); // Command to read voltage
  delay(100);       // Wait for the response

  if (pzem.available()) {
    // Read the response from PZEM-004T
    byte response[7];
    for (int i = 0; i < 7; i++) {
      response[i] = pzem.read();
    }

    // Calculate voltage from the response
    float voltage = (response[2] << 8 | response[3]) / 10.0;
    Serial.print("Voltage: ");
    Serial.print(voltage);
    Serial.println(" V");
  }

  delay(1000); // Wait for a second before the next reading
}

1. No Data Received: Ensure that the RX and TX pins are correctly connected and that the baud rate matches.
2. Inaccurate Readings: Calibrate the sensor and ensure that the current transformer is properly connected.
3. Power Supply Issues: Verify that the VCC and GND pins are correctly connected to a stable power source.

• Check Connections: Double-check all connections, especially the RX and TX pins.
• Verify Power Supply: Ensure that the power supply voltage is within the specified range.
• Use Serial Monitor: Use the Arduino Serial Monitor to debug and verify the data received from the PZEM-004T.
• Consult Datasheet: Refer to the PZEM-004T datasheet for detailed information and troubleshooting tips.

By following this documentation, users can effectively integrate the CT PZEM-004T into their projects, ensuring accurate and reliable measurements of electrical parameters.