Cómo conectar Node-RED a un PLC basado en Arduino

Cuando se programan proyectos IoT con Raspberry Pi, Arduino, o PLCs basados en ESP32, se puede utilizar tanto una ventana de terminal, como una plataforma o software para programarlos.

En esta entrada del blog, vamos a utilizar la plataforma Node-RED para enlazar Node-RED y Arduino juntos, para que podamos hacer proyectos de automatización industrial y automatización de Arduino con MQTT, WiFi, o cualquier comunicación que quieras utilizar.

Para instalar Node-RED en un PLC Raspberry o en nuestro PC, vamos a seguir los siguientes pasos:

1. Instala Git:

sudo apt install build-essential git curl

2. Instala Node.js, npm y Node-RED.

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

3. Autoincia Node-RED en el arranque e inicia el servicio.

sudo systemctl enable nodered.service

sudo systemctl start nodered.service

4.  Descarga Arduino IDE desde este enlace >

6. Añade dos nodos de inyección: Uno con el número 1 y otro con el número 0. Conéctalos al nodo Arduino.

La configuración sería así:

Despliega los cambios y haz clic en el nodo de inyección con valor 1 para activar una salida.

 Node-RED & Arduino-based PLC not connecting?

Archivo > Ejemplos > Firmata > StandardFirmata

Si no lo encuentras, ve a  GitHub >, haz clic en Code Descargar .ZIP > Ve al Arduino IDE > Sketch > Incluir librería > Añadir librería .ZIP... > Selecciona el Firmata .ZIP que acabas de descargar. De nuevo, intenta ir a Archivo > Ejemplos > Firmata > StandardFirmata.

Súbelo yendo a Herramientas > y selecciona la placa Arduino en la que se basa el PLC. En el caso del PLC M-Duino 21+: Arduino Mega 2560.  

También puedes encontrar esa información en la guía de usuario:

Continúa seleccionando la placa, el procesador y el puerto.

Vuelve a Node-RED, inyecta el valor 1, ¡y verás cómo se enciende el LED de la salida!

Consigue este flows.json, ¡y compáralo con el tuyo!

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