Project Hub /IoT & Connected Devices/Smart Energy / Water Metering/Energy Meter Circuit

Intermediate

8051

₹500 – ₹1,500

3 – 6 Hours

Partial Kit

Energy Meter Circuit

Presented here is a simple single-phase, 2-wire electronic energy meter using Analog Devices' ADE7757 chip for household energy measurement.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: LCD (generic / unspecified)
Microcontroller IC (DIP) / Chip
8051 Microcontroller
EEPROM / Memory IC
Voltage Regulator IC (7805 / LM317 / 1117)
Capacitors
Opto-coupler MCT2E

Browse all components

How It Works

The Energy Meter Circuit is designed to measure household single-phase electrical consumption using an AT89C52 microcontroller paired with the ADE7757 energy measurement IC. When mains electricity powers an appliance, a shunt resistor senses the current flowing through the circuit, while voltage signals are scaled down safely. The ADE7757 chip processes these voltage and current inputs to calculate active energy, generating a pulse output proportional to the power consumed. This pulse signal is passed through an MCT2E opto-coupler, which provides vital electrical isolation between the dangerous high-voltage mains side and the low-voltage control circuitry. The AT89C52 microcontroller counts these pulses to calculate cumulative energy usage. The calculated data can be stored securely in the AT24C02 EEPROM, ensuring that consumption history is not lost during power outages. Finally, the real-time energy data and readings are outputted and displayed visually on an attached LCD display, allowing users to monitor their electricity usage directly. Powering the digital logic and microcontroller components is handled by a 7805 5V voltage regulator alongside transformerless power supply components.

Why Build This

Monitor household electricity consumption in real-time to understand and reduce power usage.

Replace traditional electromechanical utility meters with a modern, digital electronic measurement system.

Gain practical, hands-on experience designing embedded IoT and smart energy monitoring hardware suitable for senior secondary electronics curricula.

Real-World Application

Household electricity monitoring, sub-metering individual appliances, and replacing traditional electromechanical meters.

Skills You'll Learn

Microcontroller interfacing

pulse counting and signal processing

serial EEPROM memory storage

opto-isolation techniques

power supply regulation

Safety Precautions

Mains voltage AC handling is required; ensure proper isolation and caution when working with 230V AC power supplies.

Frequently Asked Questions

Why is an opto-coupler like the MCT2E necessary in this circuit?

The MCT2E optically isolates the low-voltage AT89C52 microcontroller circuit from the dangerous high-voltage AC mains side, protecting both the user and the digital hardware from electrical shock.

What is the purpose of the AT24C02 EEPROM chip?

The AT24C02 stores energy consumption data non-volatilely, ensuring that measured electricity usage data is saved even if the system experiences a power failure.

How does the ADE7757 IC measure power?

The ADE7757 takes scaled voltage and current inputs from the mains circuit, computes active power internally, and outputs a stream of pulses whose frequency directly corresponds to the rate of energy consumption.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

PRJ-01014