Paignton Library STEM Group

STEM Group, 27th April 2024

The next Stem group event will take place on :

Date: Saturday, April 27th 2024 Time: 10:30am to 15:00 Location: Paignton Library and Information Centre Room: 13 & IT Learning Centre

What is planned?

  • Run through of Lego Robot presentation
  • Run through of model car presentation
    • This is so that we can ensure when we do the actual presentations we are able to.
  • Visitor needs help with FreeCAD and advice on 3d printing if possible

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wpa_cli utility

One of the projects I have built is Minetest server. As I didn't need a graphical user interface for this, I just used the lite version of the Raspbian operating system.

As a result, there is no nice graphical help to help users connect to Wi-Fi or other networks

The wpa_cli command utility helps to connect to a wifi network from the command line, taking information such as SSID and passphrase and connecting to the required network.

Once installed you can run wpa_cli and it will go through the connection process.

There are some instructions here that should work, but it depends on your individual usage needs.

At the library, there is a need to connect via a captive portal, so this method may not be suitable, but for other networks it should be fine, one of the reasons I want to get something up that can provide a local network for playing games, where an internet connection isn't required.


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fail2ban

In an attempt to harden the security on my Pi, I have installed fail2ban. The instructions can be found here

Fail2ban allows a remote computer to be blocked from connecting if a threshold of failed login attempts is made.

I am currently investigating why I am getting an error with this

sudo systemctl status fail2ban.service
× fail2ban.service - Fail2Ban Service
     Loaded: loaded (/lib/systemd/system/fail2ban.service; enabled; preset: enabled)
     Active: failed (Result: exit-code) since Sat 2024-04-20 19:10:27 BST; 3min 4s ago
   Duration: 696ms
       Docs: man:fail2ban(1)
    Process: 1226 ExecStart=/usr/bin/fail2ban-server -xf start (code=exited, status=255/EXCEPTION)
   Main PID: 1226 (code=exited, status=255/EXCEPTION)
        CPU: 695ms

Apr 20 19:10:26 raspberrypi systemd[1]: Started fail2ban.service - Fail2Ban Service.
Apr 20 19:10:26 raspberrypi fail2ban-server[1226]: 2024-04-20 19:10:26,805 fail2ban.configreader  >
Apr 20 19:10:26 raspberrypi fail2ban-server[1226]: 2024-04-20 19:10:26,877 fail2ban               >
Apr 20 19:10:26 raspberrypi fail2ban-server[1226]: 2024-04-20 19:10:26,879 fail2ban               >
Apr 20 19:10:27 raspberrypi systemd[1]: fail2ban.service: Main process exited, code=exited, status>
Apr 20 19:10:27 raspberrypi systemd[1]: fail2ban.service: Failed with result 'exit-code'.


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Minetest

I have now set up a Minetest server on a Raspberry Pi. This works and I am able to ssh in to the Pi and start remotely.

Minetest

I have also set up a 3.5” Pi screen, set the pi to auto login and display the IP address(s) of the Pi. I followed some of the instructions at [2],[3] to set up the screen but didn't need the sections for setting up the gui.

The next step is to set up a router so try and provide an internal network at the library for playing minetest. I followed so

  1. Minetest
  2. 3.5 Inch RPi Display Touch – XPT2046 (480x320) Guide – Raspberry Pi Forums part 1
  3. pi 3 – What have you done to make generic TFT touchscreen display work? – Raspberry Pi Stack Exchange part 2

Should be able to bring some of this to the STEM Group on Saturday and probably need help setting up the router to provide a simple LAN.

Tags

#Games,#MineTest,#PaigntonLibrarySTEMGroup


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Happy Hardware freedom day 2024

HFD is a global celebration of Free and Open Source Hardware (FOSH). Our mission for this celebration is to enlighten the public worldwide about the advantages of using high-quality FOSH in education, government, at home and in business — essentially, for all conceivable applications! The non-profit group Hardware Freedom International spearheads HFD on an international scale, offering resources, giveaways and a platform for collaboration. However, it's the volunteer teams across the globe that tailor the local HFD events to make a lasting impact within their communities.

This year, hardware freedom day takes place on April 20, 2024

https://digitalfreedoms.org/hfd

A few related links


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Matrix Beginner guide

Matrix is “An open network for secure, decentralised communication” We have some rooms on Matrix which you can access via the contact page.

If you are not sure what Matrix is, please check the video below, which gives a beginner introduction.

Other links

Tags

#StemGroup,#Matrix,#Communication.#Protocol


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Climate Change Research

A link to this was posted to the Fediverse today. So I am sharing here as it is still Science related.


The Kibo laboratory module from the Japan Aerospace Exploration Agency (comprised of a pressurized module and exposed facility, a logistics module, a remote manipulator system and an inter-orbit communication system unit) pictured as the International Space Station orbits over the southern Pacific Ocean east of New Zealand.
Credits: NASA

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What is Space-Time?

So back to some Physics videos, what is space-time?: This video does a really nice job of explaining this in a way that is understandable, but not so simple it loses any meaning.

I have included links to wondorium below, as well as links to the usual discussion forums.

Tags

#Physics,#Space,#SpaceTime


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How to Assess Peer Review Quality

Useful article on 'How to Assess Peer Review Quality'. This was posted to the Fediverse, EASE @EASE@mstdn.science. Important topic, you can read the article here on Google docs.

Tags

#Science,#Articles,#PeerReview


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