📡 ESP8266 WiFi Analyzer (Advanced Version)

A Production-Grade Offline WiFi Analysis Tool for ESP8266
Real-Time Network Scanner • Channel Analyzer • OLED Monitor

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🚀 Overview

ESP8266 WiFi Analyzer transforms your ESP8266 into a powerful offline network diagnostic tool.

No internet required.
Just connect to the ESP Access Point and open the dashboard in your browser.

This firmware provides:

• 📡 Real-time WiFi network scanning
• 📊 Signal strength (RSSI) visualization
• 📶 Channel usage analysis (1–13)
• 🧠 Automatic best channel suggestion
• 📈 Animated signal bar dashboard
• 📺 OLED live monitoring display
• ⚡ Non-blocking background scan engine

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🧠 How It Works

1. ESP8266 starts in Access Point mode
2. User connects to the device WiFi
3. Open 192.168.4.1
4. Dashboard loads from LittleFS
5. WiFi scan results are returned via JSON API
6. OLED shows live network statistics

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📂 Project Structure

ESP8266-WiFi-Analyzer/
│
├── WiFi_Analyzer.ino
└── data/
└── index.html

Only 2 files required.

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📊 Core Features

📡 WiFi Network Scanner

• SSID
• RSSI (Signal Strength)
• Signal Quality (%)
• Channel
• Encryption Type
• BSSID (MAC Address)

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📶 Channel Usage Analyzer

• Counts networks per channel (1–13)
• Displays usage bar chart
• Suggests best available channel
• Helps reduce WiFi interference

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📈 Signal Quality Calculation

Signal percentage calculated from RSSI:

If RSSI <= -100 → 0%
If RSSI >= -50 → 100%
Else → 2 × (RSSI + 100)

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📺 OLED Display (128x64)

Live display includes:

• Device Name
• IP Address
• Total Networks Found
• Strongest Signal
• Best Channel Suggestion
• Scan Status

Professional splash screen on boot.

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🌐 Web Dashboard

Premium Dark Network Tool UI:

• Modern gradient header
• Animated signal bars
• Channel usage graph
• Auto-refresh system
• Responsive design
• Smooth transitions
• Loading indicators

🎨 Color Palette

Element	Color
Background	#0f172a
Card	#1e293b
Accent	Blue / Cyan
Strong Signal	Green
Medium Signal	Yellow
Weak Signal	Red

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⚙️ API Endpoints

Endpoint	Method	Description
/api/scan	GET	WiFi scan results
/api/channels	GET	Channel usage stats
/api/status	GET	Device status info
/api/restart	POST	Restart device

All responses are structured JSON.

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🔧 Default Configuration

Setting	Value
Mode	Access Point
Default IP	192.168.4.1
Scan Mode	Non-blocking
Channel Range	1–13

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🧰 Required Libraries

Install in Arduino IDE:

• ESP8266WiFi
• ESP8266WebServer
• LittleFS
• ArduinoJson
• Adafruit SSD1306
• Adafruit GFX

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🚀 Installation Guide

1️⃣ Upload Frontend

• Place index.html inside /data
• Use LittleFS Data Upload Tool

2️⃣ Flash Firmware

• Open WiFi_Analyzer.ino
• Select board (NodeMCU / D1 Mini)
• Upload

3️⃣ Connect

• Connect to device WiFi
• Open browser → 192.168.4.1

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🛡 Performance Optimized

• No blocking delay()
• Background async scan engine
• Controlled JSON buffer size
• Limited network result handling
• Clean modular structure

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🧪 Tested On

• NodeMCU ESP8266
• LOLIN D1 Mini
• ESP8266MOD

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🛣 Roadmap

• WebSocket real-time push updates
• Export scan results (JSON)
• Interference heatmap
• Authentication system
• OTA firmware update
• Network logging system

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📜 License

MIT License – Free to use, modify, and distribute.

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👨‍💻 Author

CODE Bangla ILP
Embedded Systems & IoT Development

GitHub: https://github.com/codebanglailp

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