Silicon ChipNet Work - June 2023 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Subscriptions: PE Subscription
  4. Subscriptions
  5. Back Issues: Hare & Forbes Machineryhouse
  6. Publisher's Letter: Powerful projects
  7. Feature: Technology comes in different shapes and sizes by Max the Magnificent
  8. Feature: Net Work by Alan Winstanley
  9. Project: Arduino Programmable Load by Tim Blythman
  10. Project: 500 WATTS POWER AMPLIFIER by JOHN CLARKE
  11. Project: High-Power Buck-Boost LED Driver by Tim Blythmhman
  12. Feature: CJMCU-7620 Gesture Recognition Module by Jim Rowe
  13. Feature: Max’s Cool Beans by Max the Magnificent
  14. Feature: Circuit Surgery by Ian Bell
  15. Feature: Make it with Micromite by Phil Boyce
  16. Feature: AUDIO OUT by Jake Rothman
  17. Feature: PE hands-on product review by Julian Edgar
  18. PCB Order Form
  19. Advertising Index

This is only a preview of the June 2023 issue of Practical Electronics.

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Articles in this series:
  • (November 2020)
  • Techno Talk (December 2020)
  • Techno Talk (January 2021)
  • Techno Talk (February 2021)
  • Techno Talk (March 2021)
  • Techno Talk (April 2021)
  • Techno Talk (May 2021)
  • Techno Talk (June 2021)
  • Techno Talk (July 2021)
  • Techno Talk (August 2021)
  • Techno Talk (September 2021)
  • Techno Talk (October 2021)
  • Techno Talk (November 2021)
  • Techno Talk (December 2021)
  • Communing with nature (January 2022)
  • Should we be worried? (February 2022)
  • How resilient is your lifeline? (March 2022)
  • Go eco, get ethical! (April 2022)
  • From nano to bio (May 2022)
  • Positivity follows the gloom (June 2022)
  • Mixed menu (July 2022)
  • Time for a total rethink? (August 2022)
  • What’s in a name? (September 2022)
  • Forget leaves on the line! (October 2022)
  • Giant Boost for Batteries (December 2022)
  • Raudive Voices Revisited (January 2023)
  • A thousand words (February 2023)
  • It’s handover time (March 2023)
  • AI, Robots, Horticulture and Agriculture (April 2023)
  • Prophecy can be perplexing (May 2023)
  • Technology comes in different shapes and sizes (June 2023)
  • AI and robots – what could possibly go wrong? (July 2023)
  • How long until we’re all out of work? (August 2023)
  • We both have truths, are mine the same as yours? (September 2023)
  • Holy Spheres, Batman! (October 2023)
  • Where’s my pneumatic car? (November 2023)
  • Good grief! (December 2023)
  • Cheeky chiplets (January 2024)
  • Cheeky chiplets (February 2024)
  • The Wibbly-Wobbly World of Quantum (March 2024)
  • Techno Talk - Wait! What? Really? (April 2024)
  • Techno Talk - One step closer to a dystopian abyss? (May 2024)
  • Techno Talk - Program that! (June 2024)
  • Techno Talk (July 2024)
  • Techno Talk - That makes so much sense! (August 2024)
  • Techno Talk - I don’t want to be a Norbert... (September 2024)
  • Techno Talk - Sticking the landing (October 2024)
  • Techno Talk (November 2024)
  • Techno Talk (December 2024)
  • Techno Talk (January 2025)
  • Techno Talk (February 2025)
  • Techno Talk (March 2025)
  • Techno Talk (April 2025)
  • Techno Talk (May 2025)
  • Techno Talk (June 2025)
Net Work Alan Winstanley This month’s Net Work highlights practical problems with online payments, and we investigate some ‘dark patterns’ that try to manipulate our online behaviour and choices. Plus, we visit some live auctions! A few weeks ago, I found myself helping an elderly lady to shop for a house insurance policy, so naturally I went online in search of the best deal. The lady lives in a remote farm, so she has neither Internet access nor a mobile phone. After collecting her from the farm, I started off by ‘casting’ some insurer’s web pages from my laptop onto my smart TV in the lounge. This way we could view some insurance quotes and offers together. So far, so good. (All the major web browsers can cast to a smart TV this way, eg click the 3-dots More icon, then choose Cast. A Google Chromecast HDMI dongle is an easy way of making a TV network-ready). The first hurdle when looking online for quotes was that the lady had no email address, so I used my own instead. After we plumbed for one insurer, next came the secure payment page which called for debit card details. No problem there either, until the two-factor authentication (2FA) applet popped up demanding to send (SMS) confirmation to the lady’s phone number. My heart sank when I realised that details of her landline number were showing onscreen. At this point my cunning plan crumbled, because obviously I couldn’t collect the 2FA call over on the farm’s landline. So we rushed back to the farm again where, using my smartphone as a Wi-Fi hotspot, I managed to hook up Web browser pages can be cast onto a smart TV on the same network by using the browser’s More... Cast menu. my laptop to the web, and I punched in the debit card details again and waited expectantly for the 2FA call to come through. I’d hoped that maybe BT’s SMS to Speech service would call the landline and robotically read out a PIN number or something like that, but there was no such luck and inevitably a long phone call to an overseas call centre followed. Ultimately, I personally had to jump through some ID hoops of my own to allow my own mobile number to be added to the 1556 FR ABS IP54 enclosures Learn more: hammfg.com/1556 lady’s bank account details. After one last try, the 2FA text finally arrived on my own mobile phone and the transaction was completed. Never knowingly uninsured The drive towards going ‘paperless’ then saw an 80-page PDF insurance policy (and more besides) land in my In Box, but an all-important hard copy was promised in the post. To its credit, the insurer (John Lewis / Munich Re) was the only one that made it very ! w ne Contact us to request a free evaluation sample. uksales<at>hammfg.com • 01256 812812 10 Practical Electronics | June | 2023 ‘Confirmshaming’ is a dark pattern ploy used to ‘guilt-trip’ or ‘shame’ users into making an affirmative choice. (Image: deceptive.design) A smartphone, when paired to the car’s dash, allows the car’s web browser app to go online when parked. Other methods include using Android Auto, depending on compatibility. simple to assign policy management to a trusted third party such as myself (equipped with web and email), which would let me deal with future issues online on her behalf. This episode illustrated some of the technological hurdles and ‘gotchas’ that even the most organised people face when trying to carry out routine business online. The underlying assumption is that everyone has access to a smartphone or PC, email, a PDF reader and 2FA all set up and waiting. Without these things, conducting one’s business becomes much more difficult. Early efforts to set up telephone banking in lieu of online banking also stalled, with National Westminster Bank’s website stating that the easiest way to set this up was to go online! Elsewhere, the lurch towards a cashless society shows no sign of abating. In Britain it’s reported that increasing numbers of town councils are doing away with ‘Pay & Display’ car parking machines (ones that accept coins) in favour of forcing motorists to use apps instead. One key reason is that legacy 3G-based datacomms used by ticket machines are being wound down and councils can’t afford to upgrade them. Some more enlightened authorities offer app-based parking alongside coin-based machines that print proper tickets, which is probably the best compromise. The website ‘In Your Area’ has more to say on this at: https://tinyurl.com/n8runjdx Practical Electronics | June | 2023 Admittedly, I like the convenience of paying using the MiPay app from inside my car, even if it costs me 10p for the privilege. With this comes yet another problem: there are a multitude of different car parking apps in use (30 or so), so you have to install and register your car and debit card with the one used by your local authority – hassle that only deters older people from using smart technologies like these. My elderly friend gave up entirely when I showed how I could pair my smartphone with the car’s entertainment system, and watch YouTube channels on the car’s web browser while we were parked. The moral of the story is that as the drive to online transactions accelerates, groups of people risk getting left behind. Factors such as age, location, education and limited resources lead to low or no online presence and the result is exclusion from choices and services we take for granted. It’s not just a question of access to kitten videos or TikTok dance memes, but vital services from insurance and banking to on-street parking, everyday shopping and passports. Dark Patterns of behaviour We’ve all grown used to buying online and using the web for all manner of things. Likewise, online sellers and marketers have developed all sorts of hidden and deceptive methods to steer website users down a particular route, highlighting some options while downplaying others or omitting them altogether. The term ‘dark patterns’ is fast catching on to describe techniques used by websites, apps or software to influence or manipulate a user’s behaviour into doing something they might not otherwise do (usually, signing up or buying something or giving out information). America’s Federal Trade Commission published an interesting précis of a ‘dark patterns workshop’ event held back in 2021, which you can read at: https://tinyurl.com/2p8vm46c The UK’s Consumer’s Association (CA, publishers of the well-regarded Which? magazine) summarised the eight most-used dark patterns that are designed to urge online users into making a choice. Net Work readers will certainly recognise them, including a pressing ‘Activity message’ pop-up such as, ‘David from Manchester just bought a gadget!’, hoping that you will get carried along by the shopping frenzy. Then there’s the ‘High-demand message,’ warning that a product or service is in high demand and/or likely to sell out soon. ‘False Amazon ‘Lightning Deals’ use ‘dark pattern’ countdown timers to whip up more trade. 11 charged a compulsory ‘Buyer Protection’ fee costing £0.30 to £0.80, plus 3-8% on top. To quote their terms, Vinted, ‘does not sell or buy items shown on the site and is not a party to any transaction between users’ – more on that aspect in a moment. Other websites trade in electronics, music CDs, DVDs and tech, but it seems people will buy or sell just about anything on eBay. The process of listing items for sale on eBay has become complex and onerous, especially for simple occasional sales as there are myriad options and check-boxes to wade through, but if you have a regular stream of goods to sell then it’s worth investing some time in getting to understand the choices available. Apart from uploading up to 24 photographs, you can now add a video on eBay sales as well. Studer Breaker The Yorkshire Auction House, as seen on TV, is one of many auctioneers offering live auction feeds over the web. Thousands more are listed via auction aggregator web portals. hierarchy’ emphasises one choice over another by means of the user interface (UI) design. More insidious is ‘Confirmshaming,’ which tries to guilttrip users into making a choice: notably, the act of refusing the offer is designed to ‘shame’ the user into accepting it instead. For example, instead of displaying ‘Dismiss or ‘Cancel’ buttons an online fill-in form might show links or buttons labelled ‘No, I don’t want to save money’ or ‘No, I don’t want smarter Email’. Other dark patterns include a countdown timer indicating when a deal will expire: Amazon ‘Lightning deals’ work that way, but Amazon customers expect it as part of the package. Holiday and flight booking sites do the same, to snag more bookings. Smart online consumers are gradually learning how to recognise this manipulative design behaviour. The leading expert on ‘dark pattern’ design is the English independent consultant Harry Brignull, who has campaigned against and exposed many unethical dark patterns. You can learn more at the website: www.deceptive.design Having a good sort-out Springtime usually brings with it the urge for some domestic spring cleaning, de-cluttering and generally having a good old-fashioned clear out. It can be a liberating experience and websites such as eBay, Ziffit, musicMagpie and Vinted are convenient ways of selling off old stuff to raise some welcome cash. Ziffitt and WeBuyBooks trade in secondhand books, and their smartphone apps will scan barcodes and offer a price, subject to sight of the book. Parcels of books are then collected from your door. Some customers say that books might fetch only a few tens of pence or they might be scrapped upon receipt due to their condition, with no apology or payment being made. Even so, it’s a convenient way of recycling books rather than throwing them out. Amazon stopped its Book Trade-In service but start-up booksellers might try registering as a seller on Amazon as a sideline, sourcing used books from friends, jumble sales or charity shops, see: https://bit.ly/pe-jun23-sell The Vinted website sells clothing and fabrics, and the Vinted app makes it easy for sellers to upload their listings. The reason Vinted is free to sell is because buyers are 12 eBay’s ‘reach’ is unparalleled but one recent news item really raised my eyebrows: it was reported that Mike Godden, a retired British music studio manager, tried selling his rare Studer A80 tape recorder on eBay, and bids started to flood in. He reportedly then discovered a fault in the tape deck, so with eight days still to go he cancelled the eBay auction, something that the eBay system entitles him to do unless it’s due to finish within 12 hours. Bidding had reached £1,380 ($1,680) by then. However, Mr. Godden’s problems had only just begun: the leading bidder was from Germany, and he declared the tape deck was rightfully his, and he still demanded the goods. Unable to deliver the tape deck as advertised, things would not go well for Mr Godden. Unwilling to compromise, the German buyer then sued Mr. Godden in the German courts for breach of contract. Thanks to some arcane legal technicalities, the German court held that under EU law, which currently still has primacy over UK law in many areas, a binding contract existed between the two parties (under the EC Rome I Regulation, for anyone interested). Mr Godden, appearing in court by video link, was ordered to compensate the German buyer to the tune of £7,551 ($9,200) being the equivalent cost of a used Studer A80. Legal costs hiked up the bill to £11,600 ($14,150) which, incredibly, Mr Godden had to cough up in full. Despite complying with eBay’s own rules for cancelling the auction, Mr Godden had no redress against the online marketplace. The eBay User Agreement spells out why: ‘eBay does not have possession of anything listed or sold through eBay, and is not involved in the actual transaction between buyers and sellers. The contract for the sale is directly between buyer and seller. eBay is not a party to the transaction and is not a traditional auctioneer.’ So the German buyer was entitled to pursue the civil matter through the courts, which is what he did. eBay warns bidders that they’re entering into a legal contract when bidding. Therein lies a warning to anyone in the UK selling to EU member states (or even elsewhere in the UK, for that matter), and doubtless the high value of the tape deck sparked this unfortunate legal action. Going once... Rather than selling on eBay with all its attendant risks and pitfalls, there’s always the option of using traditional auctioneers instead. Local auction houses are buzzing with trade and, thanks to the advent of online access, it’s never been easier to watch or participate in real-time auctions conducted by reputable bricks-and-mortar auctioneers. Some readers might follow the popular TV series ‘Yorkshire Auction House’ featuring auctioneer Angus Ashworth (showing on Discovery+, Really TV). Recently, I had the great pleasure Practical Electronics | June | 2023 The SpaceX Starship is the largest rocket ever built. Shown fully stacked at Starbase in April, ready for its first integrated flight test. (Image: SpaceX/ Twitter). of letting Angus auction off some lots on my behalf. Auctions are often broadcast on the web (sometimes with sound only); so, along with some friends, I tuned in online to listen to Angus doing his stuff at a country house auction. It was the next best thing to being there, and I must admit the live sale was a bit heart-stopping at times! Well-known ‘aggregator’ auction services include ‘The Sale Room’ (www.the-saleroom.com/en-gb) and the website ‘Easy Live Auction’ (www.easyliveauction.com) which offer an online front-end for many thousands of auctions being held around the world, and they also handle back-office operations as well. It’s easy to drop in on an auction without registering, and sometimes the excitement of seeing lots going under the hammer can be more interesting than watching TV… if you like that sort of thing. There are often many hundreds of lots to get through in a session, and one can only admire the stamina of the auctioneer who has to plough through them all. For added tension, a rapid-fire ‘timed auction’ runs against the clock. Auction catalogues can be studied online beforehand, and if anything catches your eye you can register online as a buyer with any particular auction house. High-speed broadband sometimes makes for fast and furious online bidding. (Incidentally, eBay bidders can try AuctionStealer or Bidnapper for last-minute ‘sniping’.) Practical Electronics | June | 2023 In case you’re not aware, auction fees are payable by both buyers and sellers, say 20% + VAT or more – see: https://bit.ly/pe-jun23-tsr – and a small insurance premium is charged to sellers to cover any liabilities. Sellers are only paid once the buyer completes the deal, so there’s always a remote risk of sales falling through. Buyers must then arrange to collect their winning lots or incur storage fees, although the auction house might post small items or they may recommend a local haulier. Auctioneers do battle hard to provide the best service as they want to retain happy sellers and bidders but, as with all things, check the Terms & Conditions carefully. The name behind the Yorkshire Auction House TV series is Ryedale Auctioneers based at Kirkbymoorside, North Yorkshire, and upcoming auctions can be viewed at: www.ryedaleauctioneers.com – I tune in every fortnight! Other news They say that life can turn on a sixpence: in other words, events can change radically in the slightest instant. So, it’s enormously saddening to report that Virgin Orbit has ceased operations following the aborted attempt to launch satellites into orbit from Cornwall in England earlier this year. Net Work has charted the progress of Virgin Orbit since September 2021 after they used a 747 to put an array of satellites into LEO (low earth orbit), using an ordinary runway instead of a vertical launch pad. As readers know, the Cornwall ‘Start Me Up’ mission sadly ended in failure, most likely because of a faulty fuel filter. Virgin Orbit is now seeking Chapter 11 protection while attempts are made to sell the business. It would be a terrible shame to lose this expertise, but the only hope left is that another space programme might buy the know-how and assets and take the concept forward. Meantime, Elon Musk’s SpaceX company is moving on with its most ambitious project ever, the Starship super-heavy lifter. Starship has the Moon and Mars in its sights, and with up to 33 engines it is the largest, tallest, most powerful rocket ever built. Just before we went to press for this issue, the test rocket, which had been fully built-up on its Texas launch pad, was sent on its maiden flight. SpaceX had tried to dampen expectations, saying that simply getting the vehicle off the ground without destroying the launch pad site would be viewed as ‘a win’. Well, they certainly did that, but according to SpaceX engineers, three minutes into the flight, ‘Multiple engines on the 33-engine booster were not firing as the rocket ascended, causing it to lose altitude and begin to tumble. The rocket was intentionally destroyed by its self-destruct system, exploding and plummeting into the water’. With impressive engineering-speak 13 Despite a successful lift off, three minutes into its maiden flight, SpaceX Starship underwent a ‘rapid unscheduled disassembly’. understatement, the enormous Starship explosion was described as a ‘rapid unscheduled disassembly’. Yet another Chinese EV brand might be heading to our shores, with luxury maker HiPhi planning to launch in Britain. They are aimed at high-technology lovers and cars include highly advanced features such as warnings projected onto the road, and facial recognition of drivers. The Chinese website at: www.hiphi.com has English pages (if not videos). I learn that the UK electric vehicle charging network Osprey is ramping up the delivery of EV charging points, having delivered 142 new ones in just 10 weeks this year, the same number it installed in the whole of 2022, they state. A further 50 are due in April. More information can be found at: www.ospreycharging.co.uk Predictably, it didn’t take criminals long to realise that valuable cables can be stolen from the boots (trunks) of EVs, or even while the car is charging up. Chinese luxury EV maker HiPhi is preparing plans for a launch in Britain. The high-grade copper they contain can sell for £50 or more, and complete cables can fetch £200 on the black market. Domestic wall chargers themselves are also being stolen. A This Is Money article explains more at: https://tinyurl.com/2jb8vz22 The online vendor EV Cables offers plenty of technical guidance and can ship all manner of replacement cables across Europe; for more details, visit: https://evcables.com It’s come to light that EV car insurers are starting to scrap EV cars that have only suffered minor damage, the Daily Telegraph reports. Batteries are some 50% of the car’s value and damage (eg kerbing the underside) risks the cars being entirely written off due to the sheer cost, extreme complexity and hazards involved in fixing them, which makes repairs non-viable. As reported last month, the sale of used EVs continues to plummet in Britain, with some dealers simply refusing to stock any of them. Finally, on the topic of small modular reactors (SMRs), nuclear power plants that it’s hoped will shore up the power generation market, US supplier Last Energy (Net Work, June 2022) has signed deals to supply no less than 24 of their new 20MW power plants directly to UK customers through a series of trade partnerships. Details are sketchy, but buyers include a science park and a data centre developer. UK Regulatory approval is still required but Last Energy aims to start delivering within three years, they say. Ten more SMRs are also destined for Poland. This piles more pressure on Rolls Royce who have great ambitions for their own SMR, as previously described in earlier columns. That’s all for this month’s Net Work. Don’t forget that the hyperlinks above are ready-made for you to click on in my Net Work blog summary at: www.electronpublishing.com Terrington Components • Project boxes designed and manufactured in the UK. • Many of our enclosures used on former Maplin projects. • Unique designs and sizes, including square, long and deep variaaons of our screwed lid enclosures. • Sub-miniature sizes down to 23mm x 16mm, ideal for IoT devices. The author can be reached at: alan<at>epemag.net See you next month! MADE IN BRITAIN www.terrington-components.co.uk | sales<at>terrington-components.co.uk | Tel: 01553 636999 14 Practical Electronics | June | 2023