Espem

Energy monitor with dashboard/metrics collector based on ESP32 controller and PeaceFair PZEM-004T/PZEM-004Tv30 Power Meter

Internet of Things (IoT)C++GPL-3.0

Abstract

Espem is an open-source Internet of Things (IoT) project. Energy monitor with dashboard/metrics collector based on ESP32 controller and PeaceFair PZEM-004T/PZEM-004Tv30 Power Meter. A code for ESP32 controller and a set of web-tools to gather, analyse, monitor and view stat and graphs for Peacefair PZEM-004Tv30 PowerMeter. It is built using C++, ESP8266. Key capabilities include: WebUI via self-hosted HTTP/WebSocket server; Real-time gauges and power charts; MQTT publishing metrics data in json format. The complete source code is publicly available on GitHub under the GNU General Public License v3.0, making it a useful reference for students building an Internet of Things (IoT) mini project or final-year project.

1. Introduction

A code for ESP32 controller and a set of web-tools to gather, analyse, monitor and view stat and graphs for Peacefair PZEM-004Tv30 PowerMeter.

2. Objective

Energy monitor with dashboard/metrics collector based on ESP32 controller and PeaceFair PZEM-004T/PZEM-004Tv30 Power Meter

This project demonstrates how C++, ESP8266 can be applied to a real-world Internet of Things (IoT) problem.

3. Key Features / Modules

  • WebUI via self-hosted HTTP/WebSocket server
  • Real-time gauges and power charts
  • MQTT publishing metrics data in json format
  • 3 level Tiered TimeSeries metrics collector in controller's memory pool
  • data/metrics export via json
  • compressed OTA updating via esp32-flashz lib
  • espem could be build to run via DummyPZEM emulator for prototyping and firmware testing without connecting to a real PZEM device

4. Technology Stack

C++ESP8266

5. System Requirements

General requirements for this technology stack — check the README for exact versions.

  • Arduino IDE / PlatformIO or a C++ compiler (g++)
  • Target board (e.g. Arduino, ESP32) where applicable
  • Git (to clone the repository)

6. Installation & Setup

git clone https://github.com/vortigont/espem.git
cd espem

Full setup instructions are in the project README.

7. Future Enhancements

Suggested extensions you can add to make this your own project.

  • Add a mobile dashboard using Blynk or Firebase
  • Store readings in a cloud database for history charts
  • Add alerts via SMS / Telegram when thresholds are crossed

8. Viva / Review Questions

Common questions examiners ask for projects in this domain.

  1. Which microcontroller / board and sensors are used and why?
  2. How does the device send data (Wi-Fi, MQTT, HTTP, Bluetooth)?
  3. Where is the sensor data stored and visualised?
  4. How is power consumption managed?
  5. How would you secure the device and its communication?

9. Source Code & License

This project is developed by vortigont and published on GitHub under the GNU General Public License v3.0. Please follow the license terms and credit the original author when you use or modify this code.

View Source on GitHubDownload ZIP

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