Build an IoT AC Energy Meter with PZEM-004T & ESP32 | Real-Time Web Dashboard

𝗩𝗶𝗱𝗲𝗼 𝗗𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻:
In this project, we will create an IoT-based AC Energy Meter using the ESP32 microcontroller and the PZEM-004T module, a high-precision AC power monitoring solution. Unlike traditional Arduino-based setups with LCD displays, this project uses the ESP32’s Wi-Fi capabilities to host a local web server. The Webserver dynamically displays voltage, current, power, energy, frequency, and power factor on a responsive webpage. Data updates in real time without requiring manual page refreshes.

Earlier energy meter projects, such as those using the ZMPT101B voltage sensor and SCT-013 current sensor, are excellent for learning but lack precision. The PZEM-004T addresses this gap with industrial-grade accuracy.

The PZEM-004T Multifunction AC Digital Meter communicates via Modbus-RTU over RS485, enabling reliable measurement of:
1. Voltage (V)
2. Current (A)
3. Active Power (W)
4. Energy (kWh)
5. Frequency (Hz)
6. Power Factor

In this project, the ESP32 reads data from the PZEM-004T using ModbusMaster library. The ESPAsyncWebServer and AsyncTCP libraries create a non-blocking web server. The webpage uses JavaScript to fetch live data from the ESP32 without reloading, ensuring smooth real-time visualization. By the end, you’ll have a robust IoT energy meter ready for home automation, industrial monitoring, or smart grid applications.

𝗪𝗿𝗶𝘁𝘁𝗲𝗻 𝗧𝘂𝘁𝗼𝗿𝗶𝗮𝗹 & 𝗚𝘂𝗶𝗱𝗲: https://how2electronics.com/iot-ac-en...
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