Home_Power_Automation

Live Demo

• App URL: https://home-power-automation.onrender.com/index.html

Physical Implementation

System Architecture Diagram

Project Overview

IoT-based prepaid energy monitoring and control system using ESP32, MQTT (HiveMQ Cloud), Node.js backend, and Firebase Firestore.

The system measures voltage/current, calculates power and energy, publishes telemetry to MQTT, stores history in Firestore, and provides a web dashboard for live monitoring, reports, recharge, and relay control.

Hardware + Firmware (ESP32)

• Controller: ESP32 DevKit
• Voltage sensor: ZMPT101B (ADC)
• Current sensor: ACS712-30A (ADC)
• Display: LCD 16x2 I2C
• Relay control for AC load (NC logic in firmware)
• Push button for local display navigation

Firmware responsibilities:

• Read sensor values and compute power/energy
• Publish telemetry/status/relay events to MQTT
• Receive control commands from MQTT
• Apply protection thresholds and relay actions
• Persist settings/calibration in EEPROM

Backend + Cloud

• Backend: Node.js + Express + WebSocket
• Message broker: HiveMQ Cloud (MQTT over TLS)
• Database: Firebase Firestore

Data flow:

• ESP32 -> HiveMQ topics: energy/data, energy/status, energy/relay
• Backend subscribes to MQTT topics and stores records in Firestore
• Dashboard consumes:
  • live data via /api/data + WebSocket
  • report data via /api/reports?range=...

HiveMQ Screenshot

Firestore collections used:

• readings
• statusLogs
• settings/global

Firebase Screenshot

Web Dashboard Features

• Real-time voltage/current/power/energy/balance view
• Relay ON/OFF control from UI
• Recharge flow from UI
• Threshold/settings update and factory reset actions
• Reports and charting with range filters

Run/Deploy Notes

• Frontend static files are served from static/
• Backend server is in backend/server.js
• Production app endpoint is hosted on Render (see Live Demo link above)