⚡ Power Monitoring Hub

A battery-powered ESP32-based device that detects when electrical power is restored (NEPA brings light) and logs the event. It connects to WiFi via a captive portal and sends the event to a remote server or webhook. Designed for energy efficiency using deep sleep, and built for anyone to use — no hardcoded credentials required.

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📦 Features

• 🕵️ Detects power presence using a GPIO pin (relay)
• 🌙 Enters deep sleep when no power is present to conserve battery
• 📡 Wakes and connects to WiFi (via saved credentials or captive portal)
• 🕒 Syncs real-time clock using NTP
• 📤 Sends power-on timestamp to remote webhook/API (e.g., Pipedream, Firebase)
• 🌍 Optionally logs data locally (SPIFFS/LittleFS)
• ✅ No hardcoded credentials — user configures WiFi through a web interface

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🚀 How It Works

1. On boot, ESP32 checks for power using a GPIO pin.
2. If power is off, it enters deep sleep and waits for a HIGH signal to wake.
3. If power is on, it:
   • Connects to WiFi (saved credentials or captive portal)
   • Syncs time via NTP
   • Logs the power-on event with a timestamp
   • Sends the data to a configured webhook or endpoint
4. Returns to deep sleep to conserve battery.

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🛠 Hardware Required

Component	Purpose
ESP32 Dev Module	Core microcontroller
LiPo Battery / Power Bank	Power source
Optocoupler / Relay	Detect power state on input pin
Push Button (optional)	Enter WiFi config mode manually

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📲 WiFi Configuration (Captive Portal)

When first powered:

• Device creates a WiFi hotspot (Power Hub / 1234567890)
• Connect to this AP with a phone or PC
• Enter your home WiFi credentials via the web interface
• ESP32 saves and reuses this config on the next boot

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📡 Remote Logging

This project supports sending event data to a remote endpoint.

Example Payload:

{
  "timestamp": "2025-06-30T09:45:00",
  "event": "POWER_ON",
  "device": "ESP32-HUB-01"
}