For an upcoming project, I wanted to explore the capabilities of a vibration sensor, and to see if i could develop some realtime visualisation.
I had only 1 morning to experiment, so this is the result of some quick prototyping
Stack
Hardware
The sensor is a VVB001
The IFM AL1350 pushes data via MQTT to a broker.
Software
For this demo I used Aedes internally in node-red to serve as the broker.
martin-doyle
/
node-red-contrib-aedes
MQTT broker for Node-RED based on Aedes
node-red-contrib-aedes
MQTT Broker for Node-RED based on Aedes.
You can use the MQTT protocol in Node-RED without an external MQTT broker like Mosquitto.
Background
This node was created because the original MQTT broker node-red-contrib-mqtt-broker uses mosca which is no longer maintained.
Installation
You can install the node directly within the editor by using the Palette Manager.
To install the node from the command-line, you can use the following command from within your user data directory (by default, $HOME/.node-red):
npm install node-red-contrib-aedes
Flows
Just put this node on Node-RED and hit the deploy button. The MQTT Broker will run on your Node-RED instance.
Features
- Standard TCP Support
- WebSocket Support via port or path
- SSL / TLS
- Message Persistence (In-memory, LevelDB or MongoDB)
For more information see Aedes.
Server without public IP or behind firewall
If your server is behind a firewall or you cannot open any ports…
Node red then manipulates the raw byte data, scales it according the the required values, and re-publishes it on a seperate broker, and also simultainiously publishes it via HTTP request to....
InfluxDB V2 is used to store the data for long term analysis / futre playback.
Grafana is used for the web-based realtime visualisation, using the Grafana MQTT live datasource plugin. (we subscribe to the republished MQTT streams
Sidenote - this is a bit of a pain to install, and requires way more build tools than I expected!
Game Engine
I am using Godot, a capable 3D engine, to subscribe to the same MQTT topics, and visualise.
For future reference, Plugins used in this demo video include.
LD2Studio
/
godot4-graph2d
Graph 2D is an addon able to display plots in your user interface in a very simple way
Graph2D add-on for Godot 4.x
Graph 2D is an addon able to display plots in your user interface in a very simple way.
This repository contains the add-on and examples.
Features
- Display several plots on the same graph.
- Supports curve thickness and color.
- Customizable chart axes (axis label and grid).
- Real-time plotting.
- Works with all renderers.
- Works on desktop platforms and HTML5 (others target were not tested).
- Documentation included with the plugin.
Usage
Single plot
- Add a
Graph2Dnode as a child of the root node. Adapt its size to the control.
- Create a new plot using the method
Graph2D.add_plot_item()from your script. The arguments are in order the name of the plot, its color and finally the thickness of the line.- Note: This method will return an
Graph2D.PlotItemobject which will then be used to reference the plot and update its points.
- Note: This method will return an
func _ready() -> void
…
goatchurchprime
/
godot-mqtt
Godot addon which implements the MQTT client protocol
MQTT
Godot 4 addon - to implement MQTT
Installation
Clone the repo and copy the addons/mqtt folder into your project's addons folder
(or use the AssetLib to install when
Applications
MQTT is probably the simplest known networking protocol you can use to communicate between systems, which is why it is often used by low power IoT (Internet of Things) devices.
In spite of its simplicity, MQTT is extremely flexible and has the advantage of being standardized enough that you don't need to write your own server-side software. You can often get by with "borrowing " the use of a public server on the internet (see test.mosquitto.org).
Uses for MQTT in Godot are chat rooms, receiving and sending messages to physical devices, high score tables, remote monitoring of runtime metrics (eg framerate) of an alpha release for quality control, and as a signalling server for the powerful WebRTC peer-to-peer networking…
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