I. What is Node-RED
First, let's take a look at what Node-RED is. Node-RED is an open source visual programming tool based on Node.js, launched by IBM in 2013. It can be programmed through the graphical interface of the browser, allowing users to build applications by dragging and connecting predefined nodes (Nodes). Different nodes implement different functions, such as hardware nodes, storage nodes, computing nodes or logical processing nodes. By connecting these nodes, users can quickly create complex data flows and applications.
II. Features of Node-RED
1. Visual programming
The core advantage of Node-RED is that it has a visual programming interface. Users do not need to understand the basic function logic or how to process the underlying data. They can build specific applications by dragging the required nodes and connecting them with lines. This visual, low-code development method greatly reduces the development threshold and is very suitable for users without programming foundation. At the same time, the data flow can be captured through the debugging node, and the process running status can be obtained in real time, which is convenient for users to debug the system.
2. Rich node library
Node-RED has a huge node library, including core nodes, official extension nodes and third-party nodes. At present, there are more than 4,000 third-party nodes, covering multiple fields of IoT and data integration. These nodes support multiple functions such as data processing, network communication, database operations, etc.
3. Powerful scalability
Users can expand the functionality of Node-RED by installing additional node packages. This modular design enables Node-RED to flexibly adapt to various application scenarios and support the development of custom nodes.
4. Multi-protocol support
Node-RED supports multiple communication protocols, including MQTT, HTTP, WebSocket, TCP/IP, Modbus, etc. This makes it easy to interact with various devices and servers, making it very suitable for IoT-related projects.
5. Cross-platform compatibility
Node-RED uses Node.js as its operating environment. It is lightweight and efficient and can run on multiple operating systems, including Windows, Linux, macOS, and Docker virtual environments.
6. Community support
Node-RED has an active open source community and provides a large number of pre-made nodes, templates, and tutorials. Users can get support, exchange experiences, and share their own nodes and processes in the community. It is very easy for new users to get started.
7. Data flow visualization
Node-RED provides real-time data flow views and debugging tools. Users can intuitively observe data flow and program behavior, making it easier for users to debug programs.
III. Usage of Node-RED
1. After starting Node-RED, users can access the editing interface of Node-RED through a browser.
2. Create data flow
In the editing interface of Node-RED, users can select nodes from the node library on the left, drag them to the central process canvas, and connect the nodes with lines to define the path of data flow.
A typical data flow may include input nodes (injection), processing nodes (such as function computing nodes, data conversion nodes), and output nodes (such as writing to the database and transmitting information to the server).
3. Configure nodes
Each node can be configured with corresponding parameters according to actual needs. For example, configure the connection parameters of the MQTT node to connect to a specific MQTT broker and the communication parameters of the serial device, etc.
4. Deployment and operation
After completing the process design, the user can click the "Deploy" button to deploy the process to the running environment. Node-RED will process the data flow according to the defined process.
5. Advanced functions
Custom node development: Users can create custom nodes by writing JavaScript code.
Data visualization: Through the dashboard node, users can create interactive charts and dashboards to display data in real time.
Integrate third-party services: Node-RED supports integration with third-party services such as cloud storage and message notifications.
IV. Application scenarios of Node-RED
Node-RED is widely used in the fields of Internet of Things, smart home, industrial automation, data integration, etc. It can help developers quickly build and deploy event-driven applications, such as:
Internet of Things integration: Connect sensors, devices and cloud services to achieve local data collection and processing of cloud data.
Automated workflow: trigger tasks based on specific conditions, such as sending notifications or controlling devices.
Data analysis and visualization: combine data nodes to filter, convert and visualize data.
V. Summary
Node-RED, as a powerful visual programming tool, greatly simplifies the development process of IoT systems and other event-driven applications through its intuitive interface, rich node library and powerful expansion capabilities. Whether you are a beginner or an experienced developer, Node-RED can provide efficient and flexible solutions to accelerate project development and deployment.
VI. Related products
E870-EG01 edge computing gateway supports Node-RED graphical programming interface, and has 3 RS485/232 serial ports. It can access the network through 4G/Ethernet/WiFi and other methods. At the same time, it can realize remote LAN functions, support online configuration, remote configuration and other management methods, which is very suitable for PLC remote operation and maintenance, program updates, etc.