# Smart Energy Meter

Day 78 of the 100 Days 100 IoT Projects collection. Board: ESP32.

A ZMPT101B and ACS712 let the ESP32 meter voltage and current, analyzed in Blynk and MATLAB. See your home's power draw live.

## How it works

The ZMPT101B senses mains voltage and the ACS712 senses current, both as small analog signals the ESP32 samples rapidly. Multiplying instantaneous voltage by current gives real power, which accumulates into energy usage over time. Your home's power draw, measured and charted live.

## What you'll learn

- AC voltage sensing
- Current transformer basics
- Real power computation
- Energy accumulation over time

Full project (code, wiring diagram, Wokwi simulation): https://github.com/kritishmohapatra/100_Days_100_IoT_Projects/tree/main/IoT_Based_DSM_Smart_Metering

Summary by SkillShop. Code and diagrams belong to the original repo.