Build a DIY ESP32 Energy Meter with Live Dashboard Using PZEM-004T

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A new maker project guide details how to build a home energy monitor using an ESP32 microcontroller paired with a PZEM-004T v3.0 sensor, which measures voltage, current, watts, power factor, frequency, and cumulative kWh. Unlike older tutorials reliant on deprecated platforms, this build transmits data over HTTPS and WebSocket to a self-hosted dashboard on Cloudflare via the Nodrix platform. The setup provides a live dashboard accessible from anywhere, a 24-hour load history chart, and Telegram alerts when power draw exceeds a set threshold. The PZEM-004T handles all mains-side metering in dedicated silicon, while the ESP32 operates entirely on low voltage, communicating with the sensor over a serial connection. The guide includes strong safety warnings, advising users to de-energize circuits before touching mains wiring and recommending an electrician for the mains-side installation if the process feels unfamiliar.

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