ESP32 Energy Consumption Monitor Using PZEM-004T
Monitor voltage, current, power, and energy consumption in real time using ESP32 and PZEM-004T, with optional cloud logging for IoT applications.
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₹3354.00
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Components
7 items
Difficulty
Advanced
Build Time
4–6 hours (hardware + software setup + testing)
Project Details
How It Works
How It WorksThe ESP32 communicates with the PZEM-004T module via UART (Serial2). The PZEM module measures AC voltage, current, power, and energy from the connected load. The ESP32 reads these values and can display them locally on an LCD/OLED, send them to a web server, or transmit them to cloud platforms like ThingSpeak or Firebase via Wi-Fi. The system can also trigger alerts if overcurrent or overvoltage conditions are detected.
Prerequisites
Basic knowledge of electronics, familiarity with Arduino IDE and C++ programming, understanding of AC power concepts, and experience with ESP32 or similar microcontrollers. Safety awareness when working with AC mains is essential.
What You'll Learn
What You'll LearnLearn to interface with PZEM-004T using UART
Understand how to measure electrical parameters of AC loads
Implement real-time data acquisition and processing
Integrate with cloud platforms like ThingSpeak, Firebase, or MQTT
Log and analyze energy consumption data
Key Features
Display voltage, current, power, and energy in real time
Use ESP32 for wireless data transmission
Send data to cloud platforms for remote access
Trigger alerts when electrical parameters exceed safe limits
Can monitor multiple AC loads with additional modules
What's Included in the Kit
| Component | Qty | Price |
|---|---|---|
 | 1 | ₹0.00 |
 | 1 | ₹1298.00 |
 | 1 | ₹599.00 |
 | 1 | ₹0.00 |
 | 1 | ₹171.00 |
 | 1 | ₹106.00 |
Computer | 1 | ₹0.00 |
Operating Instructions
Pin Connections
Pin Connections| MCU Pin | Connected To | Purpose | Notes |
|---|---|---|---|
| RX2 (16) | PZEM-004T TX | Serial communication (receive data) | Use Serial2 for stable communication |
| TX2 (17) | PZEM-004T RX | Serial communication (send data) | Use Serial2 for stable communication |
| 5V | PZEM-004T VCC | Module power supply | - |
| GND | PZEM-004T GND | Common ground | - |
| AC Live & Neutral | PZEM-004T Current Input | AC load connection | Connect through PZEM current input as per module instructions. Ensure AC is OFF while wiring. |
Tools Required
Tools RequiredSafety Precautions
Electrical
- ⚠Only work with AC if you are confident and insulated properly
- ⚠Never touch live wires
- ⚠Use a fuse or breaker for safety
- ⚠Ensure proper grounding
Handling
- ⚠Keep ESP32 and module away from high heat
- ⚠Ensure proper isolation between high voltage and low voltage circuits
Operating
- ⚠Energy readings accumulate over time, so reset or log periodically
- ⚠Verify connections with a multimeter before applying power
Frequently Asked Questions
Frequently Asked QuestionsQ:Can I monitor multiple loads?
Q:Can I send data to cloud platforms?
Q:Can I display data locally?
Q:Is this safe for home appliances?
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