These are some of my technology writings. I am a firm believer in the value of open source software and the culture of openness and cooperation that surrounds it. So most of my written work today is about open source rather than proprietary products. If you are looking for information about Microsoft products or anything Windows-based, then you are probably in the wrong place – though please feel free to look around anyway, if you have a few moments to spare.
Following on from my last article, this is Raspberry π4 8GB for Zoneminder part 2. Now I have had time to set it up and test it for a while. Firstly, I decided to abandon the ARM64 version of Ubuntu on π because it seems slow and clunky. Basically it seems the current beta ARM64…
This is a overview of my adventures experimenting with a tiny Raspberry π4 8GB for Zoneminder GNU/Linux-based security system. Raspberry π4 for ZoneMinder Part 1 – Raspberry π4 8GB for Zoneminder (you are here) Part 2 – Update: Raspberry π4 8GB for Zoneminder Part 3 – Another update: Raspberry π4 for Zoneminder Background I have…
Folks considering remote shooting via smartphone may wish to experiment with Pavel Khlebovich’s “IP Webcam”. Basically it’s an amazingly clever and full-featured app that allows you to control the camera(s) on your smartphone with a remote computer, using standard internet protocols. https://play.google.com/store/apps/details?id=com.pas.webcam I initially got into it because it plays nicely with Zoneminder. Thus any…
Seems it’s time to buy another laptop. My trusty old Thinkpad has seen better days. Worse, a company with somewhat ironic name of “PCSpecialist” made a total pig’s breakfast of repairing my new Clevo N141ZU I had purchased from it earlier. “PCSpecialist” also lost my hard disk, then denied having it. And what “PCSpecialist” laughingly…
I recently purchased an unlocked Chinese Ulefone Armor 3W ruggedised smartphone – c/w Mediatek chipset, 8-core 64-bit CPU, dual unlocked SIM slots, 256GiB TF slot and 10300mAH battery. I have quite a soft-spot for cheap generic Chinese phones. Of course, one has to choose the product quite carefully. You need to ensure your preferred device…
Some of my favourite computers require no PSU, no batteries, no RAM, no disks, no upgrades and they are 100% resistant to all known malware. No, I’m not talking about some newfangled Linux. I’m talking about good old fashioned sliderules. 🙂 Sliderules top to bottom… Top: Darmstadt 304. Despite its German-sounding name, this sliderule was…
Discussion came up on a forum to which I belong whether it is better to use NAS (network attached storage) or external hard drives for backup. My answer is why not use both? Effectively I have three NAS servers. One is a media server. The others are purely backup – though they can quickly be…
OK, so we are still in coronavirus lockdown here in the UK and I have spent the afternoon playing! 🙂 I saw the basic idea on a web forum on a photography site, and decided to look around my garage and see if there was any thing suitable to produce something similar. I also took…
A few snaps of my old Roamer Ten kit radio in the garden and in the shed, on a bright sunny day. Well, it seemed a relatively enjoyable way to spend a sunny COVID-lockdown day.
Freebies to beat those lockdown blues This is a collection of virtual backdrops and wallpapers that you may download, manipulate and enjoy, for free. These images were created by capturing and saving a large number snap-shots of an open source music visualisation application for GNU/Linux called ProjectM – not to be confused with a 2008…
I was 12 years old when I built my first multi-band shortwave radio – a Radio Exchange Roamer Ten kit – as pictured above. After many nights surreptitiously listening to it hidden under the bedclothes so my mum never found out, I soon realised just how insular and generally pisspoor most our media is in…
The lovely Alexa Allure wearing a cheongsam dress and listening to the world on a 1981 vintage Sony ICF 2001 multiband receiver. Back in the day, Sony used to be one of the market leaders in shortwave radios. Its big selling feature was the continuous AM band that covered all the standard LF, MF and…
Left: complete installation including toilet, cistern, isolating valve hose, mounting bracket and the shattaf itself. Right: Close-up of shattaf. It is quite small, measuring approximately 11 cm long and about 6 cm front-to-back. As the coronavirus crisis deepens, seems we also have the deeply undignified spectacle of fully grown adults publicly fighting each other as…
An interesting question came up a little while back on one of the photography fora to which I belong “I’d be interested in knowing how you swapped the halogen bulbs for LEDs because I have the same problem and as you say those bulbs are hotter than hell, makes using modelling lights with a grid…
I had a bit of interest in my Linux media servers recently. In fact I recently completed four Linux media or Zoneminder builds. Here are a few snaps… The machines are based on basic Novatech business PC’s. Nothing special. The media server versions have KDE Neon GNU/Linux. This is a very attractive KDE based desktop…
Seems there is quite a lot of buzz about a “new” image format called “WebP” that is seeing increasing use on-line recently. Although it is attributed to Google, WebP was not strictly a Google invention. It was originally developed by On2 of New York as part of its VP* series “Truemotion” video codecs. Google acquired…
Today I had to spread some nematodes around our recently planted Portuguese laurel trees. But before I put the nematodes in water, I thought it would be fun to look at them under the microscope, and possibly take some photos with my recently acquired 26mm eyepiece to µ4/3 camera adaptor. The camera is my little…
For continuous lighting, one needs a light source that has good colour balance, uses power efficiently, is reasonably robust and does not present a health or fire risk. I am also a tightwad – interested primarily in “bangs per buck”. Whilst I love new technology, I am not prepared to pay silly money for it….
This is how I converted three left-over cheapie (£60 for a box of ten, delivered) 20 watt daylight LED flood lights for use in the studio. The basic tools you need:- Vernier or digital caliper, M10 ISO metric taps. Suitable spanner (17mm AF). Bench vice. Electrician’s screwdriver and wire strippers, to make the electrical connections….
I have always been rather fascinated by the fractal-like properties of the romanesco. It really does look like it is not of this planet. SO I thought it would be fun to team up a romanesco, some cheap RGB LED lighting and a couple of broken silver coloured mannequins. Just in case anyone is wondering:…
I thought I’d play a tick on my girlfriend, such that when she came home from work, she’s find it filled with aliens. As it happens I messed it up and fell over something in the hall bruising my leg and spoiling the surprise. Which she thought was all rather silly anyway. But I did…
I decided to have a go at repairing the HF tweeters unit in my vintage Tannoy Monitor Golds. It was a tricky old job. More pictures to follow.
More LED experiments – this time using some small daylight LED and a 12 volt DC power supply to light the Dexion racking.
I’ve had this old but very chunky Tamron 80-210mm Adaptall 2 telephoto zoom lens since the mid 1980s. Only I noticed that the overall image quality had become rather poor. I wanted to find out why. When I shone a small torch through it, I noticed what appeared to be a haze. Despite several cleans…
Macro shots using an elderly Soviet era 58mm 44-m4 Helios lens and a 10 mm macro ring. Much to my surprise, it seems to work remarkably well, certainly on my little µ4/3 camera.
