ESP8266 Smart Energy Meter with Protections (PZEM-004T)- Readymade Project

Description

The Smart Energy Meter & Protection System is a complete ready-to-use electrical monitoring and safety project designed using an ESP8266 microcontroller, PZEM-004T energy meter module, an external current transformer, a 16×2 I2C LCD display, and a relay module.

It allows real-time measurement and monitoring of important AC electrical parameters such as voltage, current, active power, energy consumption, frequency, and power factor. Additionally, it features an intelligent protection system that automatically cuts off the load during Over-Voltage (OV), Under-Voltage (UV), and Over-Current (OC) events.

The system provides a local hardware display through the 16×2 I2C LCD (with a physical button to toggle data pages) and an independent, built-in Web Dashboard for monitoring and configuration over WiFi—no third-party cloud apps required. It is perfect for educational projects, demonstrations, appliance protection testing, and basic home energy monitoring.

Demo Dashboard

⚙️ Key Features

📊 Real-time measurement of:

• AC Voltage (V)
• Load Current (A)
• Active Power (W)
• Energy Consumption (kWh)
• Frequency (Hz)
• Power Factor
• Connected Load & Protection Status

🛡️ Smart Appliance Protection: Automatic relay cut-off for Over-Voltage, Under-Voltage, and Over-Current faults.

📱 Built-in Web Dashboard: Interactive UI hosted directly on the ESP8266 (No Blynk or external cloud required).

📟 On-Device Monitoring: Real-time monitoring using a 16×2 I2C LCD with a push-button to toggle display pages.

⚡ PZEM-004T Module: Highly stable electrical parameter measurement.

⭕ Non-Invasive Current Sensing: Uses an external current transformer.

🔄 Auto-Recovery & Memory: Saves your custom protection thresholds and relay modes to onboard LittleFS memory.

🌐 Dual WiFi Modes: Connects to your home router (Station Mode) or broadcasts its own network (Access Point Mode) if WiFi fails.

🛠️ Adjustable Controls: Switch between Auto Protection, Manual ON, and Manual OFF directly from your browser.

📱 Built-in Web Dashboard Monitoring: The beautifully designed, responsive web interface can display: ⚡ Voltage & Current ⚡ Active Power & Energy ⚡ Frequency & Power Factor ⚡ Live Sparkline Graphs ⚡ Active Fault Reasons (e.g., “Over Voltage”, “Disconnected”)

The ESP8266 hosts this dashboard locally. Simply connect to its IP address via your smartphone or computer browser to view real-time data, adjust safety thresholds, and toggle the relay.

🎯 Improved Measurement Performance: The PZEM-004T directly measures multiple AC electrical parameters and communicates digitally with the ESP8266. Compared with energy meter projects using separate ACS712 current sensors and ZMPT101B voltage sensors, the PZEM-004T generally provides:

✅ More stable electrical readings

✅ Direct voltage and current measurement

✅ Built-in active power calculation

✅ Built-in energy accumulation

✅ Frequency & Power-factor measurement

✅ Reduced analog calibration requirements

✅ Better resistance to ESP8266 ADC noise

🎯 Recommended Loads

• Incandescent bulbs
• Fans
• Soldering irons & Electric irons
• Heaters & Kettles
• Desktop computers & Televisions
• Other medium-to-high-power single-phase appliances

📦 Package Includes

• ESP8266 Development Board
• PZEM-004T Energy Meter Module
• External Current Transformer
• 2 Channel Relay Module (For load protection)
• 16×2 I2C LCD Display
• Push Button (For LCD page toggling)
• Project Mounting Board
• Jumper Wires & Required Connectors
• AC Input Wiring & Plug
• AC Socket for Load Connection
• Pre-uploaded ESP8266 Program

The exact enclosure, PCB, breadboard, connectors, wire colours, and component appearance may vary depending on component availability and selected product configuration.

📐 Measurement Range and Specifications

• AC Voltage: Typical Measurement Range: Approximately 80V–260V AC (Recommended for Single-phase household AC supply)
• Load Current: Depends on the supplied PZEM-004T version (10A or 100A CT version).
• Protection Limits: Default OV=260V, UV=180V, OC=30A (Fully adjustable via Web UI).
• Controller: ESP8266
• Connectivity: 2.4GHz WiFi (STA + SoftAP)
• IoT Platform: Local HTTP Web Server (No external cloud/app needed)
• Supply Type: Single-phase AC

Actual accuracy and measurement limits depend on the PZEM module version, current transformer, wiring quality, connected load, electrical noise, and supply conditions.

🎯 Suitable For

🎓 Engineering and Diploma Students

🧪 Electronics and IoT Hobbyists

🏫 School and College Science Exhibitions

🔬 Educational Demonstrations

🧑‍💻 ESP8266 and Web Server Learning Projects

🏠 Basic Home Energy Monitoring & Appliance Protection

🔌 Appliance Power Consumption Testing

⚡ Single-Phase AC Load Monitoring

🛠️ Final-Year Academic Projects

⚠️ Limitations

❌ Not certified for legal, commercial, or utility billing purposes.

❌ Not a replacement for an electricity-board-approved energy meter or MCB.

❌ Designed only for compatible single-phase AC systems (Not for 3-phase).

❌ Remote monitoring requires being on the same local WiFi network (unless port-forwarding is configured).

❌ Actual readings may differ slightly from professional calibrated instruments.

❌ Energy data is stored by the PZEM and may reset if the module is swapped or factory reset.

❌ The ESP8266 and low-voltage sections must be protected from exposed mains wiring.

❌ Continuous commercial or industrial operation is not recommended without a certified enclosure and professional electrical installation.

🔐 High-Voltage Safety Warning

This project works with potentially lethal 230V AC mains electricity. Incorrect wiring, exposed conductors, loose connections, damaged insulation, or improper handling may cause:

• Severe electric shock
• Fire
• Short circuit
• Component damage
• Serious injury or Death

Always disconnect the AC power supply before touching, moving, modifying, or reconnecting the system. The product should be installed and operated only by someone with adequate electrical knowledge or under the supervision of a qualified electrician. Never touch the PZEM-004T high-voltage terminals or AC wiring while the system is powered.

🚀 Why Buyers Love This Smart Energy Meter & Protection System

📊 Complete Multi-Parameter Monitoring: Measure voltage, current, power, energy, frequency, and power factor using one compact system.

🛡️ Smart Auto-Protection: Peace of mind knowing your appliances are instantly cut off during voltage spikes, drops, or over-current situations.

📱 No Apps Required: View beautiful, real-time interactive graphs and data via the built-in web dashboard on any browser.

⚡ PZEM-004T-Based Measurement: Provides direct digital electrical measurements, avoiding problems associated with separate analog sensors.

🧠 Practical IoT Learning System: Learn how ESP8266, LittleFS memory, JSON parsing, async web servers, and UI design work together.

🔌 Minimal Setup Required: The project is assembled, programmed, and tested before dispatch.

Important Purchase & Setup Instructions

• Account Creation: Before purchasing this product, make sure to create an account on this website.
• Payment Process: After completing your purchase, do not press the back button. The payment system will automatically redirect you to the order page. If you face any payment-related issues, inform us at [email protected].
• Next Steps: After purchasing, our team will contact you soon regarding the shipment procedure.
• System Setup: Upon powering the device, you can connect to its broadcasted WiFi (“ESP_EnergyMeter”) or configure it to join your home network. No third-party accounts are needed.

Shipping Information

• Delivery Area: This product is exclusively available for delivery Pan India.
• International Shipping: Not deliverable outside of India.
• Shipping Time: Customers need to give at least 7 days for arranging and preparing the shipment after purchase.

Terms & Conditions (Please Read Carefully)

• Cancellations: After the item has been shipped, no modifications or cancellations are possible.
• Returns: Once the product is delivered, no returns are accepted.
• Warranty Policy: This product carries no standard warranty.
• Support: Virtual support is only available for 1 month from the date of delivery.
• 3-Day Replacement Policy: If the system is not working upon arrival, you must inform us within 3 days of delivery by emailing [email protected]. Make sure to record a full unboxing video without no edit and no cut. If any editing found, immediately replace procedure will terminate. We will replace the faulty components only after a thorough technical checkup confirms the defect.
• Post-3 Days: After the initial 3-day period, no complaints, replacements, or service requests will be entertained.

The Smart Energy Meter & Protection System is a complete ready-to-use IoT-based electrical monitoring project. It integrates both hardware display (I2C LCD) and an advanced local web dashboard, making it ideal for learning, demonstration, and smart appliance protection.