01 Node-RED Basic
•
11 likes•7,304 views
Node-RED is a visual tool for wiring together hardware devices, APIs and online services to build IoT applications. It uses a flow-based programming model where inputs enter "nodes" that perform actions and output results to other nodes. While most programming is done visually using pre-defined nodes, additional functionality can be added through JavaScript. The document provides steps to create simple flows in Node-RED that inject data, pass it through functions, and output results to the debug panel or Twitter. This includes creating a flow to request live UK electricity consumption data from a website every 5 minutes and tweet the results.
Report
Share
More Related Content
What's hot
What's hot (20)
Viewers also liked
Viewers also liked (20)
Similar to 01 Node-RED Basic
Similar to 01 Node-RED Basic (20)
Recently uploaded
Recently uploaded (20)
01 Node-RED Basic
- 1. 01 Node-RED Play some Flow
- 2. Node-RED • Node-RED is a visual tool for wiring the Internet of Things (IoT). • Traditional IoT development can be very technical, but Node-RED takes care of the technicalities and lets you concentrate on the logic of your workflow. • While most programming in Node-RED is done visually using pre-defined functions (“nodes”), any additional functionality can be added in JavaScript
- 4. Nodes
- 5. Create a First Flow Add inject and debug node
- 6. Create a First Flow Wiring two node and click deploy
- 7. Create a First Flow Click on the Inject button
- 8. Create a First Flow Place function between inject and debug and wiring
- 9. Create a First Flow Create a function to convert timestamp to date format
- 10. Create a First Flow Deploy and press inject node again
- 11. Create a Twitter Flow • Create inject, debug, httpRequest, function, and twitter nodes. • Create tweet some informations about the live UK total electricity consumption
- 12. Create a Twitter Flow • Add a inject node and change its parameter, by double click
- 13. Create a Twitter Flow • Change the repeat into “interval” and every 5 minutes to allow inject automatically every 5 minutes Automatic every 5 minutes
- 14. Create a Twitter Flow • Add httpRequest node (in part “function”) to request to web site, then double click to change parameter
- 15. Create a Twitter Flow • Enter URL : http://www.nationalgrid.com/ngrealtime/realtime/systemdata.aspx • To request UK electricity consumption Request URL
- 16. Create a Twitter Flow • Add a function node with and change output to 2 output by double click to change parameter
- 17. Create a Twitter Flow • Create function to parse the http response output to extract power demand, frequency and time msg to output 1 , frq50 to output 2 Produce 2 Output
- 18. Create a Twitter Flow • Wiring all nodes and click deploy
- 19. Create a Twitter Flow • Add a twitter node (part “social”) and double click to edit property by double click (you need twitter account) Set Account
- 20. Create a Twitter Flow • The twitter account added The Account
- 21. Create a Twitter Flow • Modify function to send some data to twitter by create 3rd variable and change output to 3, the 3rd output will tweet The 3rd output to twitter
- 22. Create a Twitter Flow • Wire the 3rd of UK electricity to twitter then deploy The tweet data