High-Precision Magnetic Anomaly Detection System based on WIZnet W5500
A real-time precision measurement system for defense and exploration, powered efficiently by STM32 and W5500. (Patent : CN121254371A)
WIZnet - W5500
x 1
The cover image of this article was generated by Gemini.
1. Key Insights: Why W5500?
Q. Why choose an MCU and W5500 over a high-end processor?
1ns Precision Synchronization: To prevent MCU overload issues that occur with software stacks, ensuring precise timing.
Role of W5500: The Hardwired TCP/IP Stack offloads network processing, allowing the MCU to focus 100% on sensor control.
Q. What actual performance was achieved with the W5500?
Ultra-Low Latency: Achieved end-to-end latency of < 400µs (Immediate detection of rapid signal changes).
Stable Throughput: Maintained 25Mbps throughput across the industrial temperature range (-40℃ to 85℃).
2. Hardware Specifications
To ensure stability, Data Processing (MCU) and Network Transmission (W5500) are physically separated.
| Category | Model | Key Role | Notes |
|---|---|---|---|
| MCU | STM32F407VET6 | Data acquisition control, Signal filtering, Algorithm | Main Controller |
| Ethernet | WIZnet W5500 | TCP/IP Offload, High-speed Real-time Transmission | SPI Interface |
| Sensor | TMR8625 (x8) | 3-Axis micro-magnetic field detection (24 channels) | High-Sensitivity |
| ADC | ADS131M08 (x3) | 24-bit high-resolution conversion (Global sync applied) | Precision ADC |
3. System Logic & Data Flow
"MCU focuses on sensors, W5500 handles complex communication"
Image generated by Gemini.
Acquisition: 24-channel sensor data is collected simultaneously within 1ns error using a global clock.
Processing: STM32 performs signal filtering and data encapsulation only.
Transmission: The W5500 receives packets and immediately transmits them to the PC via the hardware stack.
4. Technical Details for High Precision
Sophisticated system design supports the performance of the W5500.
- Smart Operation Mode
Normal: Activates only 4 sensors to save power.
Event Detected: Immediately switches to Full Array (24 sensors) and W5500 High-Speed Mode for precision data transmission.
- Noise Isolation Design
Physically separated Analog (Sensor) and Digital (W5500/MCU) grounds (GND).
Connected via high-quality Ferrite Beads to prevent communication noise from affecting the sensors.
5. Applications
This system is applied in rigorous industrial environments beyond the laboratory.
🌍 Geophysical Exploration: Precise analysis of underground mineral resources and geological structures.
🛡️ Defense & Security: Covert movement detection of metallic objects (e.g., submarines, vehicles).
🌊 Harsh Environment Monitoring: Unmanned monitoring in inaccessible areas like underwater or outdoor environments.
💡 Conclusion
"This project proves that W5500's Hardwired TCP/IP technology plays a critical role not only in simple IoT devices but also in high-precision scientific instruments requiring nanosecond-level synchronization."
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CN121254371A
