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Raspberry Pi Hosting Node-Red What is Node-Red?



RASPBERRY PI HOSTING NODE-RED

By C. Mobberley
Turn your Pi into a host for visually wiring the internet of things.
 * What is Node-Red?
 * Setting up node.js
 * Setting up Node-Red
 * Managing Node-Red
 * Wiring your first Flow
 * Installing extra Nodes
 * Further information


 * Single page
 * Download PDF

Feedback? Corrections?


WHAT IS NODE-RED?

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subscribe to this guide.

Close
Node-Red in its simplest form is an open source visual editor for wiring the
internet of things produced by IBM. What does this mean? Well for someone lazy
like me it means I can spend more time making stuff "talk" to each other than
worrying about all of the interfacing code I will need to write.

The system contains "Nodes" which look simply to be icons that you drag and drop
on to the canvas and wire together. Each Node offers different functionality
which can range from a simple debug node to be able to see what's going on in
your flow, through to a Raspberry Pi node which allows you to read and write to
the GPIO pins of your Pi.

To give an example of what can be done here is my home twitter account telling
me where I'm currently located and whether it is going to rain any time soon. I
even have a Google maps link thrown in for good measure.


The flow to produce something like this within Node-Red is shown below and it
took me literally 15 minutes to have everything set up.

To summarise the flow:


 1. An App on my phone called MQTTitude send my location to Node-Red
 2. The basic framework of my twitter message is then created in a function node
 3. I take my location and query Forecast.io for the weather at that location
 4. The returned data is then formatted in to my tweet message using further
    function nodes
 5. The message is then sent to a Tweet node and tweeted for me

Normally this would have taken me a good few hours to complete. But with
Node-Red I am able to do it in minutes. I am not worrying about all of the
interfacing to MQTT, HTTP or Twitters API. All of that is done for me by
Node-Red.

So now I've sold you the idea.. lets get to the installation!
Setting up node.js 

This guide was first published on Jan 25, 2014. It was last updated on Jan 25,
2014.

This page (What is Node-Red?) was last updated on Jan 21, 2014.

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Difficulty: Intermediate
Guide Type: Skill
Categories: Raspberry Pi/Learn Raspberry Pi
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