The PZEM-004T V3, manufactured by Peacefair, is a versatile and compact energy meter designed for monitoring and measuring key electrical parameters in AC circuits. This module can measure voltage, current, power, energy, and frequency, making it an essential tool for energy management and monitoring systems. It features a UART interface for seamless communication with microcontrollers, enabling integration into IoT and automation projects.
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
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
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
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 DesignerBelow are the key technical details of the PZEM-004T V3:
| Parameter | Specification |
|---|---|
| Voltage Range | 80V - 260V AC |
| Current Range | 0A - 100A (with external current transformer) |
| Power Range | 0W - 22kW |
| Energy Range | 0kWh - 9999kWh |
| Frequency Range | 45Hz - 65Hz |
| Communication | UART (9600 baud rate, 8N1 format) |
| Power Supply | Self-powered (from measured AC line) |
| Accuracy | ±0.5% |
| Operating Temperature | -10°C to 60°C |
| Dimensions | 48mm x 23mm x 22mm |
The PZEM-004T V3 has a 4-pin interface for communication and power connections. The pinout is as follows:
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | Power supply for the UART interface (3.3V or 5V) |
| 2 | GND | Ground connection |
| 3 | RX | UART Receive pin (connect to TX of microcontroller) |
| 4 | TX | UART Transmit pin (connect to RX of microcontroller) |
Connect the Current Transformer (CT):
Connect the Module to a Microcontroller:
VCC and GND pins to the 5V and GND pins of the microcontroller.RX pin of the PZEM-004T V3 to the TX pin of the microcontroller.TX pin of the PZEM-004T V3 to the RX pin of the microcontroller.Power the Module:
Read Data via UART:
Below is an example Arduino sketch to interface with the PZEM-004T V3 and read voltage, current, and power data:
#include <PZEM004Tv30.h> // Include the PZEM-004T V3 library
// Define the RX and TX pins for UART communication
#define RX_PIN 10
#define TX_PIN 11
// Create a PZEM object with the specified RX and TX pins
PZEM004Tv30 pzem(RX_PIN, TX_PIN);
void setup() {
Serial.begin(9600); // Initialize serial communication for debugging
Serial.println("PZEM-004T V3 Energy Meter Example");
}
void loop() {
// Read voltage, current, and power from the PZEM-004T V3
float voltage = pzem.voltage();
float current = pzem.current();
float power = pzem.power();
// Check if the readings are valid
if (isnan(voltage) || isnan(current) || isnan(power)) {
Serial.println("Error reading data from PZEM-004T V3!");
} else {
// Print the readings to the Serial Monitor
Serial.print("Voltage: ");
Serial.print(voltage);
Serial.println(" V");
Serial.print("Current: ");
Serial.print(current);
Serial.println(" A");
Serial.print("Power: ");
Serial.print(power);
Serial.println(" W");
Serial.println("-----------------------------");
}
delay(1000); // Wait for 1 second before the next reading
}
No Data Received from the Module:
Incorrect Current or Power Readings:
Module Not Responding to Commands:
Q: Can the PZEM-004T V3 measure DC circuits?
A: No, the PZEM-004T V3 is designed specifically for AC circuits and cannot measure DC voltage or current.
Q: Can I use the module with a 3.3V microcontroller?
A: Yes, the UART interface supports both 3.3V and 5V logic levels.
Q: How do I reset the energy counter?
A: The energy counter can be reset by sending a specific command via UART. Refer to the module's command set documentation for details.
Q: Is the module safe for high-power applications?
A: Yes, the PZEM-004T V3 can measure up to 100A and 22kW, but ensure proper insulation and safety precautions when working with high-power circuits.