How to create a Node Red application

In this tutorial we will show you the Node Red desktop, install the graphical user interface and create a workflow example.

Requirements:

  • Node Red is installed and started on your RevPi.
  • You know the IP address of your RevPi.
  • You have already configured your RevPi module with PiCtory.

You will also need:

-PC or laptop
-Ethernet cable

Let’s go!

  • Connect your RevPi to your PC using the Ethernet cable.
  • Start both devices.
  • Open the browser on your PC.
  • Enter this address in the address line: http://The IP address of your RevPi:1880

Node Red opens.

How to install the graphical user interface

  • Click on the burger menu.
  • Click on “Manage palette”

  • Click on the “Install” tab.
  • Search for the entry “node-red-dashboard”.
  • Click on “Install”.

The dashboard will now be installed.

  • Once the installation is finished click on “Close”.

Create a flow

In this example we will create a flow to switch an LED on the RevPi.

  • Drag the “Button” node into the flow.

  • Drag the “Exec” node into the flow.
  • Connect the two nodes.

  • Double-click on the “Exec” node.

The “Edit exec node” window opens. You can enter the processing commands here.

  • Enter the following command: “piTest -w RevPiLED,1”.

  • Double-click on the “Button” node.
  • The “Edit button node” window opens. Here you can define what the button should do. In this example it should switch on.
  • Add the button to the “On” group.
  • Click on “Update”.
  • You have the option to rename the button.
  • Click on “Done”.
  • Click on “Deploy” to create the application.

 

You can now view the result on the dashboard.