Signal K, stream data changes

Updated 2025-06-28 !

Are You searching for a solution where You want to create graphs and gauges from SignalK(SK) data ?

Use NodeRed(NR), installed as a SK plugin, with the standard dashboard and it's easy to create info as seen in the picture. And this is without a database as InfluxDB and tools like Grafana.

You use the WebSocket interface, or SK subscribe nodes, to subscribe to changes in data from the SK server. 

Signal K quick install, Raspberry Pi, Ubuntu

Updated 2025-06-23 !

I have got some questions installing, just, Signal K(SK) so will do a summary with links.

Signal K is the hub to receive data, from different devices in different data formats, and send it on to different equipment, or databases, in different formats. Most common for standard marine equipment are the old NMEA 0183 and the newer NMEA 2000 protocol which is also handled. 

Besides the SK "hub" function developers have created plugins for different purposes. This is due to that SK is open-source ! Sharing is caring !

In this post you can check the devices I'm using connected to the SK server and also my setup.

One-liner Internet speedtest, Linux CLI, Node-Red, Home Assistant

We’ve been using Mobile Broadband for several years and have always been keen to measure the speed from our Internet Service Provider (ISP).

I’ve posted several variants, mostly Node-RED(NR) flows and programs that often use Python. I’m now slowly converting to Home Assistant(HA), and was glad there was an integration,  Speedtest, to do the job. But I couldn’t get it to work since HA didn’t like that the test took more than 10 seconds, 

Then I tried a Speedtest NR node, but it didn’t install because it needed Python dependencies...... (NR was installed as a HA "Add-on")

Volvo Penta D4/D6 water pump leak

Updated 2025-06-10 !

The sea water pump, labeled 3589907 and replaced by 21380890, was leaking a little so a change of seal was necessary. Numbers below refers to the explode view.

• Detach the generator belt from the pump pulley and the 2 hoses from the pump.
• Unscrew the water pump, 4 scews, from the engine block.
• Remove the cover, 7, from the pump.
• Pull out the impeller, 6.
• Remove the cam, 4, by unscrewing screw 18.
• Remove the washer, 22.
• Remove the lock ring 14 and washer 21.
• With a pliers try to remove the seal 8.

Home Assistant with VirtualBox or Proxmox or Ubuntu KVM ???

After testing Home Assistant (HA) for a while, I’ve realised it could improve my home automation, despite that I'm using Apple HomeKit.

When I tested HA with Node-RED and some other "Add-ons", on a Raspberry Pi 3 (RPi) I found that its computational power wasn’t enough.

The following setup could be any computer but I recently bought an Apple Mac Mini M4, replacing my 2018 (M18) model, so the M18 was really a great candidate for my HA setup.

The preferred method of running HA is through the HA Operating System (HAOS), which makes your "life" easier. 😉

Home Assistant core install, Raspberry Pi and Python 3.12 & 3.13

Updated 2025-06-02 !

This will soon be a deprecated installation method !!

The best way to start with Home Assistant(HA), and Raspberry Pi(RPi), is off course to use the ”Raspberry Pi imager” and in the menu select "Other specific-purpose OS => Home Assistant and home automation => Home Assistant". This will install the HA operating system.

It works very well and here are the install instructions. 
On the other hand if you want to add HA to a RPi which you already have up and running, without Docker, you need to install something which is called "Home Assistant Core".

Please check the "Remarks" below before you start.

New version for Python 3.13 ! Below info is not updated but just change from 3.12 to 3.13