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Real-Time IoT Smart Energy Meter with SMS Alerts
2026-02-03 | By Rinme Tom
License: General Public License Breadboards Jumper Wires Arduino ESP32
๐ Summary
In this Maker project, youโll build a Smart Energy Meter using IoT and an ESP32 microcontroller and a PZEM-004T energy sensor to monitor electrical parameters like voltage, current, power, power factor, and energy consumption in real time. Data is transmitted to a cloud dashboard via MQTT, and critical electrical anomalies trigger automated SMS alerts โ providing safer, smarter energy monitoring for residential, commercial, and industrial applications.
๐ง Why This Project Matters
Traditional energy meters only record total usage and require physical readouts. With this IoT smart energy meter, you can:
Track power usage remotely from anywhere with internet access.
Visualize data live on an MQTT web dashboard.
Receive SMS alerts for abnormal electrical conditions like over-voltage or excessive current.
Use the system as a foundation for advanced automation (e.g., load control, efficiency reporting).
๐ How It Works: System Architecture
This IoT smart energy meter combines local measurement, cloud publishing, and alerting:
๐งฉ Core Flow
Measurement:
The PZEM-004T measures electrical parameters using internal sensors and a current transformer (CT clamp).Processing:
The ESP32 reads PZEM data over UART (Modbus Protocol), formats it, and prepares it for transmission.Remote Publishing:
Data is sent via Wi-Fi to an MQTT broker and displayed on a remote dashboard in real time.Alerts:
When predefined thresholds (e.g., high voltage) are exceeded, an SMS alert is sent using a cloud API.
๐ Real-Time Dashboard
A lightweight web dashboard visualizes:
Voltage (V)
Current (A)
Active Power (W)
Cumulative Energy (kWh)
Frequency (Hz)
Power Factor
It connects to the MQTT broker using WebSockets and updates values instantly as new data arrives.
๐ฑ SMS Alerts: Stay Notified
This project integrates with a free SMS API via a cloud service so that when thresholds like over-voltage or overload are detected, the registered mobile number receives an automated alert. The system checks conditions in the ESP32 code and only sends messages when necessary to avoid spam.
โก Practical Use-Cases
This IoT smart energy meter is ideal for:
โ Real-time home energy monitoring
โ Safety alerts for faulty wiring or dangerous conditions
โ Remote power management for vacation homes or remote installations
โ Base for smart home automation integrations (e.g., Home Assistant, Node-RED)
๐ Tips for Success
Ensure the CT clamp only encircles the live conductor โ not both live and neutral.
Validate I2C addresses if the LCD shows no output (commonly 0x27 or 0x3F).
Use a secure MQTT broker if deploying in a production environment.
๐ Conclusion
This project combines embedded systems, IoT communication, and real-time alerting into an accessible smart energy meter solution. With just a few components and open tools like the Arduino IDE and MQTT, you can transform raw electrical data into meaningful insights and actionable alerts โ empowering smarter, safer energy usage.
