Sig Diary

May 14, 2025 · View on GitHub

GitHub release License: MIT

A passive background scanning application for Flipper Zero that logs and annotates signals (IR/RF/NFC) based on fingerprinting. Perfect for hobbyist recon or daily security audits.

📋 Features

  • Multi-protocol Scanning: Simultaneously monitors IR, RF, and NFC signals
  • Automatic Annotation: Identifies common signals such as garage doors, remote controls, and access cards
  • Signal Logging: Maintains a timestamped log of all detected signals
  • Interactive UI: Browse through captured signals with detailed information
  • Persistent Storage: Saves all signal data to the SD card for later analysis

Starting the App

  1. On your Flipper Zero, navigate to Apps → Tools
  2. Find and select Sig Diary
  3. The app will start scanning immediately

Controls

  • Center Button: Toggle between scanning and log view
  • Left/Right Buttons: Navigate through logged signals (in log view)
  • Back Button: Return to scanning mode or exit app

Understanding the Display

Scanning Mode

  • Shows active scanners (IR, RF, NFC)
  • Displays total number of signals detected
  • Notifies when new signals are detected with LED flash

Log View

  • Shows timestamp of the signal
  • Displays signal type (IR, RF, or NFC)
  • Shows annotation of the signal when available
  • Navigation controls at the bottom

Signal Log File

All detected signals are logged to: /ext/sigdiary/log.txt

🔍 How It Works

Sig Diary runs three concurrent background scanners:

  1. IR Scanner: Detects infrared signals from remote controls
  2. RF Scanner: Monitors radio frequencies (primarily 433.92MHz, 315MHz, 868MHz)
  3. NFC Scanner: Detects nearby NFC cards and tags

When a signal is detected, the app:

  1. Records the signal's characteristics
  2. Timestamps the detection
  3. Attempts to identify the signal type based on fingerprinting
  4. Logs the information to the persistent log file
  5. Notifies the user with a brief flash

Signal Database

Help improve signal identification by submitting information about common RF, IR, and NFC signals to our database.

📜 License

This project is licensed under the MIT License - see the LICENSE file for details.

⚠️ Disclaimer

Sig Diary is intended for educational and security audit purposes only. Always respect privacy and property rights when scanning for signals. The authors are not responsible for any misuse of this application.

Credits

Made with ❤️ for the Flipper Zero community