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Hi and welcome to a new section in this course, this section is dedicated to note read, I'm going

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to talk a little bit about what new threat is and give you some examples of its use.

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You can get a better idea of what it is that we're about to do.

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And then in the next few lectures in this section, I'll show you how to install it on your Raspberry

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Pi and explain the use of some of its most important notes and how they work inside simple flows.

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So first off, what is not red?

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So not red is a programming tool.

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Actually, it's a better way to describe it is a programming environment.

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It uses graphical flows and notes, which are the individual components in a flow to create a program.

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What I really like about note read is that it is both graphical.

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So it gives you the the visual capability of creating a program, but also it allows you a lot of functional

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control through JavaScript, which is the programming language and its underlying note.

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Read the home of note, read on the web is not red dot org, which you are looking at right here.

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And just scrolling down this page, you will see these basic features.

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So it's basically a programming environment that operates inside a browser.

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You create graphical programs which are called flows and flows are composed of nodes, which are these

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rectangular items that you see in this small screen here.

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It uses a drag and drop interface and you can assign those nodes in a variety of configurations.

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Each node does something specific or you can program make so that it does exactly the tasks that you

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wanted to do.

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Node Red comes with several built in nodes, but you can also install third party nodes, just like

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in the Adenike, install third party libraries.

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And I'm going to show you more about this in a moment.

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The name No Dread comes from the underlying technology on which it is built, which is no G.S., which

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is a JavaScript framework.

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It's a very lightweight development environment and runtime environment, which makes it excellent for

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creating applications that are supposed to be very nimble and very fast in their execution so they can

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run on low cost hardware such as the Raspberry Pi note read is open source.

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And as a result, there's a lot of people that are contributing to it.

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It's been around for a long time and it's really stable and used by hobbyists and large corporations

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alike.

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All right.

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So I'm going to show you a quick demonstration of what no, it looks like and I've got no right here

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installed on my Raspberry Pi four.

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And this is the version of the flow that makes up the brains of the terrorism controller.

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Talked about this in an earlier lecture in this course.

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But I also want to show you a few other flus that I have designed.

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And as you can see in the Web editing, the Web browser editing, you can have Flo's under tabs.

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And now all of this flows are actually deployed and are operating at the same time.

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So this one here, for example, is a 22 sensor.

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This one will just trigger the sensor every 10 seconds and get a reading.

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So here's another flow.

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It's a little bit more elaborate.

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This one uses the kitty in node to get data it subscribes to immediately topic.

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Every time that there is a new item in the queue, it will trigger this note and then the data from

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that item will be passed on to other nodes down the flow where those nodes can either be a function

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node such as this one.

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Here we got a little bit of JavaScript doing something with the data it has received, processing it,

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or in this case here you can see that we are using a Haiti to be post node, which forwards the data

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to a Iot application.

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This happens to be tweet Dode Io so that the flow can communicate with other applications elsewhere

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on the Internet.

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A few other examples here.

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We can use timestamps, you can use Web hooks.

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This is a manual trigger I can press on this button.

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You can see that it injects a particular piece of data.

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It happens to be a text message, but it can be any of those other things into the flow, which is then

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printed out by the payload.

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Serrefine.

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Expand its menu.

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Just clean this up and let's see for the current flow, only the vacations.

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And you can see there are some triggering the halloo node.

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I get the message coming out, which has been created by the debug node right here.

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So here we've got a WebSocket node so we can use WebSocket as well.

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In this example here, I've got again a manual inject node which passes a bit of data to a function

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node.

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Then this function will split the data into three components and then create three outputs in each sense,

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each component to a separate output.

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Right.

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So those will go out and you can see actually the first and the second output go both to message to

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expand.

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My sidebar here and go for current flu, let's a trigger the inject mood and you can see I had node

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one, which is message one printed out one and message to put out one and two because of this connected

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to the first and the second output of the function.

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And then we've got message three, a node message three, which prints out number three.

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Right.

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So it's just gives you an idea of what you can do here with these flows and what this look like on the

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left toolbar.

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I've got all the nodes that are available.

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Most of the notes that you can see here are built into node red.

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But a couple of them, such as, let's see the dashboard.

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Collection is a third party series, the library An, that you can install and then you can use to create

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graphical user interfaces.

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So if you go back to my terrarium and expand the sidebar, you can see here I've got the dashboard,

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which is created by the dashboard collection, and that creates the dashboard that you see here.

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That is part of the terrorism project.

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All right.

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So I hope that this gives you a good overview of what node red is and how you can use it in your projects.

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One more thing that I want to note here before we move on to the next lecture, which is the installation

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of note read on the PI is documentation.

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No read has got amazing documentation.

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If you're just starting now, I recommend you have a look at getting started.

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And then the user guide to getting started shows you how to install the application or the environment

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on a variety of computers.

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I'll be following the instructions in the Raspberry Pi box.

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And then apart from that, the user guide contains everything that you need to know in order to get

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started.

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And what are you going to be touching a few items out of this list.

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These are the items that we absolutely need for our project.

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But in order for you to have a better and a complete understanding of note read, I encourage you to

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have a look at least browse through the contents of the user guide.

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Apart from that, depending on what you want to do, you'll find tutorials and a cookbook.

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Also very useful to the cookbook, for example, tells you exactly how to do specific things I say are

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fairly comprehensive list here.

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All right, so having said all that, let's move on to the next election now where I'll show you how

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to install Node Red on the Raspberry Pi.

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Just keep in mind that the Raspberry Pi always does come with no direct already installed.

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But I prefer to just go for a fresh install so we have total control of what is running on your spraypaint.