Most ESP32 energy-meter tutorials you'll find are built on platforms that have since changed out from under them — deprecated app flows, retired tokens, code that no longer compiles as written. This build has no such dependency. A PZEM-004T does the metering, the ESP32 reports over plain HTTPS/WebSocket, and the dashboard, history, and alerts run in nodrix on your own Cloudflare account — nothing in the path can be discontinued on you.
What you get: live volts, amps, watts, and a lifetime kWh counter on a dashboard you can open from anywhere, a 24-hour load curve, and a Telegram message when something draws more than it should.
Safety first
This project meters mains electricity. The ESP32 side is all low-voltage, but the PZEM's input terminals connect to live line and neutral:
De-energize the circuit before touching any mains wiring, every time.
