Node-RED programming intro

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Node-RED programming intro

In order for the box to obey your commands, you have to speak its language. And the HARDWARIO box speaks the Node-RED programming language. But don’t worry, dictionaries and textbooks aren’t necessary here - you’ll learn to use it in just a few minutes. 💪

What is Node-RED?

Node-RED is a simple programming tool in which you tell your box what to do and when to do it. It works on the flow-based principle. It’s a flow for a reason - all your commands flow like a river through the Node-RED. 🌊

In your Playground you will find the Node-RED in the Functions tab. When you click on it, you will see a list of so-called nodes on the left. Nodes represent individual actions that take place in your programme. For example, pressing a button, sending a message to a mobile or displaying a chart of ambient temperature. Node-RED flow

One by one, you drag nodes from the left menu to the empty desktop in the middle of the window and connect them - in this simple way you create your entire programme. Click on the dot in the right or left of the node and drag it to another node as if you were connecting it with a string.

As soon as you activate one of the nodes - for example when you press the button on the box - all the features that you have connected to the node for pressing the button, will run, just like this: edit node red flow

The purple node on the left means pressing the button. The yellow one that follows it is for creating a message. And the two that are connected to them are for sending a message to a mobile (the green one) and reading a message out loud (the blue one). Thanks to the node interconnection, all actions are performed step by step after pressing the button, and faster than in a second on a top of that!

When you click on any node with your mouse, its settings will open, where you can modify its further behaviour in different ways.

And that’s all you need to know to programme in the Node-RED. Being a programmer is a piece of cake, isn’t it? 🤓

Nodes that you definitely need for your invention

MQTT node - Node-RED

MQTT is the starting point of every programme. You can set up what it is supposed to respond to (pressing the button on the box, change in temperature or turning the box), and when this happens, all nodes that are connected to the MQTT are activated.

Change node - Node-RED

Change Try to imagine Change as a dressing room. The programme passes through it and changes into something else. For example, into a text message. It is then sent to other nodes that are connected to it and process it further, for example, they send it to a mobile phone or read the message out loud.

Notify Blynk node - Node-RED

Node Notify node has a clear mission - to send a notification to a mobile. It will be displayed in the Blynk app. [Blynk](

Chart node - Node-RED

When you connect the Chart node to your programme, you will see beautifully clear charts of various features of the box in the Dashboard tab. For example, how the ambient temperature has changed or how many times you have pressed the button.

Audio Out node - Node-RED

S nodem Audio out you will have a lot of fun with the Audio node - it tells your computer to make some sound. For example, if you connect it to the Change node, in which you type a message, your computer will read it out loud. But no swears! 😎

Now that you know what it’s all about, programme your own project! We have prepared a bunch of cunning inventions for inspiration. Check them out