RP2040_OPCUA_Server
Implementation of an IIoT temperature sensor based on OPC UA
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Project description
Project Description
Embedded network system development utilizing the RP2040 MCU and WIZnet W5500 Ethernet module
Implementation of an OPC UA server on FreeRTOS, enabling industrial-standard communication in embedded environments
Supports DHCP automatic IP assignment for seamless network configuration
Real-time temperature sensor data acquisition using onboard ADC for live monitoring
Designed for Industrial IoT (IIoT) and smart factory applications
Key Technology Overview: What is OPC UA?
OPC UA (Open Platform Communications Unified Architecture) is an open communication standard for industrial automation
Built on TCP/IP with platform-independent architecture, supporting various operating systems and hardware
Ensures secure and reliable data exchange with built-in authentication, encryption, and access control
Supports complex data modeling, real-time event notifications, and historical data management
Developed to overcome the limitations of the legacy OPC Classic protocol
Key Features
| Feature | Description |
|---|---|
| DHCP-based IP Allocation | Flexible network setup with automatic IP addressing |
| OPC UA Server & Variable Registration | Provides real-time data such as temperature and task status |
| Onboard Temperature Sensor | ADC-driven temperature monitoring with live data sharing |
| FreeRTOS Multitasking | Independent tasks for SPI communication, OPC UA server, and sensor data |
| Reliable TCP/IP Communication | W5500 + lwIP stack ensure stable Ethernet connectivity |
System Architecture
| Component | Role |
|---|---|
| RP2040 MCU + W5500 Ethernet | Hardware platform with SPI interface for network communication |
| FreeRTOS | Multitasking OS managing independent SPI, OPC UA server, and sensor tasks |
| lwIP TCP/IP Stack | Network stack with DHCP client for dynamic IP management |
| OPC UA Server | Handles client connections and exposes address space data nodes |
| SNTP Synchronization | Provides accurate time for OPC UA event logging and history support |
Application Areas
Factory automation: Real-time data exchange and control between PLCs, sensors, and HMIs
Smart factories and IIoT: Data collection and analytics in industrial IoT environments
Energy management: Monitoring and control of power plants and substations
Building automation: Integrated control of HVAC, lighting, and security systems
Cloud integration: Seamless connectivity with MES, SCADA, and cloud platforms
