RP2040_OPCUA_Server
Implementation of an IIoT temperature sensor based on OPC UA
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