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Right now that we have a working installation of no on the respray pay, let's start doing some little

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exercises and become introduced to nodes and Flooz in this lecture, I'm going to show you some of the

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most important nodes.

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Have a look at the properties, how to configure them, how to install third party nodes as well, and

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a few other bits and pieces that will make it easier in the next lecture to assemble a first simple

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flow.

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And so on the left to buy, you can see the list of default or built in nodes that come with a fresh

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installation of node red.

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We can expand on those and installed, as I said earlier, third party nodes as well.

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I can show you how to do that as well in this lecture.

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So let's pick a very common node called Depak and just drag and drop it on to the flow convert.

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So this is the Dipak node.

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Its job is to output text or pretty much numbers or any other output into the back window that can appear

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on the right toolbar right here.

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Each node, of course, has got its own responsibilities.

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Now, all nodes, when you double click on them, reveal the edit pane and depending on what kind of

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node it is, the properties tab is going to have its own configuration and set of widgets that you can

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interact with and basically set up the node.

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In this case, the debug node.

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Allow us to print out into the Dipak window right here on the right toolbar information that is coming

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into it from previous nodes in the same flow.

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And we can configure exactly what it is that we want the node to output and be using a lot of this specific

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node later on.

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And it can also control where we'd like the information to appear.

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In most cases, you want to send it out to the debug console.

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But for example, you may want to also send messages out the system console, which is particularly

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useful if you are running node red on the command line.

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In our case, we are running it as a system service, so it does make sense to use a system console

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for output.

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We can always customize the name of a node.

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So in this case, I'm going to say that this is an example debug node.

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And, Don, and you can see that the name appears here.

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So you should always really customize the name of your notes to make it easy to see what they are in

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your flow.

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Just consider that a note is similar to a function in a traditional program, and every function needs

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to have a reasonable name to be able to see what it does without having to go through all of the details

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or the code inside the function itself to always have a reasonable name here.

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Another thing that is available to you within the Web browser interface of note read is information

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about the node.

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So especially as you are starting on the right side on the right toolbar, click on the I button here

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and there.

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Depending on the node that you've selected, you'll get information about the node as well as documentation.

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So the book icon here gives you documentation so you can read out and understand what that particular

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node does.

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Let's bring another one.

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Let's say the injector node case, it can say selecting the inject node and I can get information about

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what it does from the documentation directly.

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So I don't have to browse into the actual documentation of website of node red.

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It all comes with it when you install it on your Raspberry Pi.

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Again, you've got access to the eye button for additional information and you can see the various properties

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of this particular node for go for the example, Dipak Node and the properties that are set for this

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mode, again, depend on the node.

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Now, let's see.

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Another interesting thing from the info tab is the lineage, I guess, of all the hierarchy of notes

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and the flows into which they belong to.

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So I've got a single flow tab.

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You can see it's name is Flow One, which is the same name that appears up here in the actual tab.

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And this flow contains these two nodes that can enable and disable those nodes.

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It's like commenting out code in a traditional program.

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You can just click on this little radio button here to enable it and disable it.

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It can see that the node graphical widget adjusts to indicate whether it's on or off, enabled or disabled.

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You can also trigger it manually from here, of course, in this case, it doesn't make any sense because

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I haven't configured these nodes to do anything useful.

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But you can trigger them if you want to.

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I'm going to show you some examples in later lectures on how to do that and why it's useful.

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Now, another thing I want to show you is this burger menu, I guess, are called here.

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Expand it by clicking on the three lines.

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And there is a particularly interesting option here called Managed Polet.

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When you go into managed permit, you go into this menu here, which allows you to install third party

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Flo's nodes or collection of nodes.

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So one particularly useful collection of nodes that I would be using a lot in this project is the dashboard.

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So you can simply search for something that you're interested.

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You can see there's a lot of modules available, but let's say we are interested in some kind of dashboard

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and there's a lot of different options here contributed by a note read.

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Developers go for this one here, which is very well developed and contains some excellent collection

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of notes that allow you to create dashboards.

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So installing this is as simple as clicking with the install button.

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Just click on that so you still can get more information, of course, if you want.

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And a few seconds later.

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Oh, maybe that I mean it.

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You've got a bunch of new notes installed in your Raspberry Pi, apart from that, I also want to install

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a couple of others.

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For example, if you want to have a.

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To censor attached to your Raspberry Pi, I'm going to do a little later you can interact with the 22

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center directly from within node red and there is a node for that.

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It's the node rate Cantrip DHT censer.

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I'm just going to install that as well.

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And there's a new note as well, there's a few other notes and note collections that I'd like to use

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in this project, and I'm going to show you and talk about those later when the time comes.

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But for now, I just wanted to show you how to install a new node or collection of notes so you can

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experiment with them.

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Now, to go back to the notes tab, you see all the notes and note collections that are currently installed

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in your note read installation so we can close this window and then scroll down the left toolbar to

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have a look at the new items in the list.

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So here's the dashboard.

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So, for example, let's go for a switch.

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Right.

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So here's a switch note, double click on it.

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You can set it into a new UI or user interface group.

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You can create as many as you want, can label it so tooltip for additional help and so on.

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So every dashboard node has got its own set of properties and we don't worry about exactly what each

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of those properties does.

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Going to show you and explain what you need to know for the purposes of this project.

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Later on in this section, I'm going to demonstrate how to create a simple dashboard.

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And also here's the Raspberry Pi, the 22 node, which I also manually installed a bit earlier.

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And you can see what it looks like.

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It's pretty self-explanatory about how to configure it.

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All you need is the tapin for the 22 and you could go.

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Another interesting and useful feature here is the settings option or the settings pane to select that,

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and then you can use it to basically configure your working area, the language, the grid nodes, etc..

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And here's the Polet again, accessible also from this location, from the user settings and shortcuts

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for your keyboard.

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So on.

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So all very useful stuff.

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Before we move on, another thing that I want to point out is that after installing the dashboard collection

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of notes, another item appeared here in the right toolbar, which is the dashboard.

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So this is the central place where you can create new tabs and new collections of dashboard widgets.

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And again, this is something that I'm going to explore further in dedicated lectures later on.

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For now, that's all I wanted to say about notes.

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In order to make notes, do something useful, we need to connect them together like this and therefore

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create flows.

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Let's move on to the next lecture where I'm going to show you a few simple note configurations.

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It flows a few simple things that you can deal with him.