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🚛 Python CAN Bus & J1939 Sniffer (GUI Source Code)

Stop struggling with raw Hex dumps. A production-ready CAN Bus Sniffer that automatically decodes J1939 PGNs (e.g., Engine Speed, Oil Temp) into human-readable text. Built with Python & Tkinter.

[J1939 Sniffer Demo]

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🚀 Why this tool?

Professional tools like Vector CANalyzer are expensive. Simple Python scripts often lack a GUI.

This project bridges the gap. It provides a Clean GUI that connects to your hardware (Vector, PCAN, Kvaser, SocketCAN) and translates 29-bit J1939 IDs instantly.

Perfect for:

• 🚛 Automotive Engineers: Debugging Truck/Bus ECUs.
• 🤖 Robotics Developers: Monitoring CAN-based actuators.
• 🎓 Students/Researchers: Learning the J1939 protocol structure.

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✨ Features

• 🚛 Native J1939 Parsing: Automatically parses Priority, PGN, and Source Address.
  • Example: 18F00400 → EEC1 - Engine Speed (RPM)
• 🎮 Built-in Simulation: No hardware? No problem. The "Demo Mode" generates realistic traffic so you can test the UI logic immediately.
• 🔌 Universal Support: Works with any interface supported by python-can (slcan, socketcan, vector, pcan, ixxat, etc.).
• 📊 Live Monitor: Real-time scrolling table with Timestamp, DLC, and Hex Data view.

🛠️ Dependencies

pip install python-can

📥 Download Full Source Code Get the complete, fully commented source code (main.py). You can use it as a standalone tool or integrate the J1939 parsing logic into your own projects.

👉 Download on Gumroad ($9.9): Link

(Includes: main.py, requirements.txt, and Setup Guide)

📖 Code Sneak Peek (J1939 Logic) The code includes a helper function to extract PGNs from 29-bit Extended IDs:

Python

def parse_j1939_id(self, can_id):
    """Extract PGN and Source Address from 29-bit ID"""
    pgn = (can_id >> 8) & 0x3FFFF
    sa = can_id & 0xFF
    priority = (can_id >> 26) & 0x7
    return pgn, sa, priority

👨‍💻 About the Author Phil Yeh - Senior Automation Engineer

My Gumroad Store (More Engineering Tools)

Keywords: Python, CAN Bus, J1939, SAE J1939, PGN Decoder, ECU, OBD2, Sniffer, GUI, Tkinter, Automation, Vector, PCAN