microfab

Microfab abstracts the data traffic of a production onto a board. With two ESP32 and a Raspberry Pi OPC UA and MQTT are explained clearly

Scenario

Two IoT nodes (ESP32 & Raspberry) sending data to an edge device (Raspberry Pi). The ESP32 sends its data via MQTT. The Raspberry Pi has implemented an OPC UA server which is accessed by the edge device. The data is stored on the edge device and can be visualized afterwards.

Requirements

Hardware

• Raspberry Pi 4B
• Raspberry Zero W1
• Espressif ESP32 microcontroller
• WiFi Router

Software

... implemented in Microfab

• Raspberry Pi OS Lite 64bit
• Raspberry Pi OS Lite 32bit
• Arduino IDE to program the ESP32

... required for coding

• A Python IDE (e.g. Pycharm)
• Arduino IDE
• Git
• Terminal

Microfab Control

Docker Containers

We use Docker to manage our services on Microfab Control.

Docker is a Free Software for isolating applications using container virtualization. Docker simplifies application deployment by making it easy to transport and install containers that contain all the necessary packages as files. Containers ensure the separation and management of resources used on a computer. This includes: code, runtime module, system tools, system libraries - everything that can be installed on a computer.

wikipedia

  flowchart BT
        id1_1[MQTT Client]
        id1_2[OPC Server]
        id2_1[MQTT Broker - Mosquitto]
        id2_2[OPC Client]
        id3[Telegraf]
        id4[InfluxDB]
        id5[Grafana]

        id1_1 --> |1883| id2_1
        id1_2 --> |4840| id2_2
        id2_1 --> id3
        id2_2 --> id3
        id3 --> id4
        id4 --> id5

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Mosquitto

Eclipse Mosquitto is an open source implementation of a server for versions 5, 3.1.1, and 3.1 of the MQTT protocol

dockerhub

A good introduction to the topic is provided by this video (German).

OPC UA Client

Self-created OPC UA client that can be accessed via a browser

Telegraf

Telegraf is an open source agent written in Go for collecting metrics and data on the system it's running on or from other services. Telegraf writes data it collects to InfluxDB in the correct format.

dockerhub

InfluxDB

InfluxDB is a time series database built from the ground up to handle high write and query loads. InfluxDB is meant to be used as a backing store for any use case involving large amounts of timestamped data, including DevOps monitoring, application metrics, IoT sensor data, and real-time analytics.

dockerhub

Grafana

Grafana is a multi-platform open source analytics and interactive visualization web application. It provides charts, graphs, and alerts for the web when connected to supported data sources.

dockerhub

  classDiagram
      MicrofabControl -- WiFi_Router
      MQTT_Client -- WiFi_Router
      OPC_Server -- WiFi_Router

      class MicrofabControl{
          Raspberry Pi
          Docker
      }
      class WiFi_Router{
          TP-Link Router
          ssid: Microfab_00x
      }
      class MQTT_Client{
          Espressif ESP32
      }
      class OPC_Server{
          Raspberry Pi
          Open62541 OPC Server      
      }
      

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