Introducción
In the previous post >vimos cómo crear un Servidor Web Arduino para leer los datos de los pines de entrada analógica al navegador con la automatización de Arduino.
En esta entrada del blog, vamos a mostrar esos datos en un Dashboard de Node-RED para hacerlo más legible y atractivo para el usuario con un PLC industrial Arduino.
Requisitos
- Industrial Arduino PLC controller >
- Power Supply >
- Ethernet cable >
- Cable tipo B para programar el controlador industrial Arduino >
Lecturas anteriores
Node-RED
Node-RED es una herramienta de programación para conectar dispositivos de hardware, APIs y servicios online de formas nuevas e interesantes.
Proporciona un editor basado en el navegador que facilita el cableado de flujos utilizando la amplia gama de nodos de la paleta que se puede desplegar a su tiempo de ejecución en un solo clic.
Ahora, vamos a hacer lo siguiente para ejecutar Node-RED en nuestro portátil y poder leer los datos de nuestro controlador lógico programable Arduino con Ethernet:
1. Instalar git.
2. Instalar Node.js, npm y Node-RED.
3. Configurar Node-RED para que se inicie automáticamente en el arranque.
Instalar Git
Puede que necesites ejecutar el siguiente comando para asegurarte de que npm es capaz de obtener y construir cualquier módulo binario que necesite instalar:
sudo apt install build-essential git curl
Instalar Node.js, npm y Node-RED
Instala Node.js, npm y Node-RED utilizando este script que también se utiliza para actualizar una instalación existente cuando hay una nueva versión disponible.
bash <(curl -sL https://raw.githubusercontent.com/node-red/linux-installers/master/deb/update-nodejs-and-nodered)
Autostart en el arranque
Ejecuta el siguiente comando si quieres que Node-RED se ejecute cuando el PLC de código abierto se encienda, o se reinicie.
sudo systemctl enable nodered.service
sudo systemctl start nodered.service
Conoce más en el: sitio web de Node-RED >
Nodos del Dashboard de Node-RED
Asegúrate de que puedes acceder a Node-RED localmente. Abre el navegador y escribe:
http://localhost:1880/
Si es así, tienes que descargar los nodos de Node-RED Dashboard para poder hacer un Node-RED Dashboard fácilmente.
Por lo tanto, puedes descargarlos de dos maneras:
1. EO bien yendo al menú de Node-RED > Haciendo clic en Gestionar Paleta > Instalar > Tipo: node-red-dashboard > Instalar.
2. O yendo al directorio /home/$USER/.node-red:
cd /home/$USER/.node-red
e instalando el conjunto de nodos del dashboard para Node-RED.
npm install node-red-dashboard
Estos son los nodos que deberías ver
Obtener datos de entrada del servidor
En la anterior entrada del blog, aprendimos cómo hacer un servidor web Arduino y comprobar los datos al navegador con números crudos.
Pero, ¿qué pasaría si los valores de entrada se mostraran mejor en un tablero GUI Node-RED?
Para conseguirlo, vamos a enviar una petición GET al servidor para obtener los datos del PLC Arduino.
Luego, dividiremos la información de cada entrada, y la dividiremos para ver los valores de las entradas.
Flows.json
1. Añade un nodo inject, y realiza la petición cada 1 segundo.
2. Conéctalo a un nodo de petición HTTP:
Method: GETURL: http://10.10.10.30 (<- IP from Arduino based PLC or server)Payload: IgnoreReturn: a UTF-8 string
3. Añade un nodo split con los parámetros por defecto.
4. Añade un nodo de conmutación:
Property: msg.parts.index== 0== 1== 2== 3== 4== 5
5. Añade seis nodos de cambio, conéctalos a las salidas del nodo interruptor y haz lo mismo en todos ellos:
set msg.payload to (expression) $number($trim(payload))
6. Conecta seis nodos de calibre, uno para cada salida, y configúralos:
Group: Configure a group and tab.Size: Set a size, like 4x3Type: GaugeLabel: from I0.7 to input I0.12 in our caseValue format: {{value}}Range: min 0 max 1024
Y cambia los colores si quieres
Ve al menú Dashboard de la derecha > pasa el ratón por tu pestaña y grupo > Haz clic en layout > Y despliega los widgets como quieras.
Por último, ve al Tablero de Control, y ve tus datos gráficamente:
http://localhost:1880/ui
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Tutorial de Arduino: Dashboard de Node-RED y servidor web de Arduino