How to connect Node-RED to Arduino-based PLC

When programming IoT projects with Raspberry Pi, Arduino, or ESP32-based PLCs, you can use either a terminal window, or a platform or software to program them.

In this blog post, we will use the Node-RED platform to link Node-RED and Arduino together, so that we can do industrial automation and Arduino automation projects with MQTT, WiFi, or whatever communication you would like to use.

In order to install Node-RED onto a Raspberry PLC or our PC, we are going to follow these steps:

1. Install Git:

sudo apt install build-essential git curl

2. Install Node.js, npm and Node-RED.

bash <(curl -sL https://raw.githubusercontent.com/node-red/linux-installers/master/deb/update-nodejs-and-nodered)

3. Autostart Node-RED on boot and start the service.

sudo systemctl enable nodered.service

sudo systemctl start nodered.service

4.  Download the Arduino IDE from this link >

6. Add two inject nodes: One with number 1 and the other one with number 0. Connect them to the Arduino node.

The configuration would be like this:

Deploy changes and click on the inject node with value 1 to activate an output.

 Node-RED & Arduino-based PLC not connecting?

File > Examples > Firmata > StandardFirmata

If you do not find it, go to the GitHub >, click on Code > Download .ZIP > Go to the Arduino IDE > Go to Sketch > Include Library > Add .ZIP Library... > Select the Firmata .ZIP you just downloaded. Again, try to go to File > Examples > Firmata > StandardFirmata.

Upload it by going to Tools > and select the Arduino Board whose PLC is based on. In the case of M-Duino 21+ PLC: Arduino Mega 2560. 

You can also find that information in the user guide:

Continue by selecting the board, processor and port.

Go back to Node-RED, inject the value 1, and see how the LED from the output turns on!

Get this flows.json, and compare it with yours!

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 Now, try with the other ones and start programming your application!