Description
The PZEM-004T V4.0 (100A) Multi-Function AC Power Monitor is a widely used module for electrical energy measurement in modern IoT and embedded system projects. It is designed to accurately measure key electrical parameters in a single-phase AC system, including voltage, current, active power, and energy consumption.
This compact module is ideal for measuring true RMS voltage and current, making it suitable for real-world power monitoring applications. The PZEM-004T V4.0 features an integrated design that simplifies both installation and usage. It can be powered directly from the AC line being measured or via an external power supply.
Current measurement is achieved using a non-invasive current transformer (CT clamp). The user simply passes the live wire through the circular CT sensor, eliminating the need for direct electrical contact and enhancing safety during installation.
One of the key advantages of the V4.0 version is its TTL UART serial communication interface, which allows seamless integration with microcontrollers such as ESP32, Arduino, and other embedded platforms. This eliminates the need for RS485 converters used in earlier versions, making system design simpler and more efficient. Communication with a computer or other interfaces can be achieved using appropriate adapters, such as TTL-to-USB or TTL-to-RS232 converters.
The module supports real-time data acquisition and parameter configuration through serial communication, making it highly suitable for smart energy monitoring systems, IoT dashboards, and automation projects.
Key Features:
- Accurate measurement of electrical parameters: voltage, current, active power, and energy (kWh)
- True RMS measurement for reliable AC monitoring
- Non-invasive current sensing using a 100A CT clamp
- TTL UART serial interface for easy communication with microcontrollers
- Energy accumulation and storage, even after power loss
- Energy reset (clear) function via command
- Real-time monitoring and data transmission capability
- Compatible with PC monitoring via TTL-to-USB interface
- Simplified wiring and improved efficiency compared to earlier versions
The PZEM-004T V4.0 is therefore an excellent choice for applications such as smart meters, energy management systems, fault detection, and IoT-based power monitoring solutions.
