A Driving Instructor's Blog

Computers & Tech

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DoogleBooks LCD drawing and writing padEver since I became an instructor I’ve managed to get through a lot of notebooks. Anyone who does this job will know that you have to sketch a lot of things when you’re explaining stuff to pupils.

I started off buying notepads, but realised that was quite expensive – especially if you wanted the larger sizes. Then I turned to making my own, by ring-binding punched copier paper and using that. I discovered that normal two- or four-hole punching was no good, because the sheets could easily get torn with all the handling and jolting they get in the car, so I turned to spiral binding. That served me well for many years – but I was starting to feel my conscience nagging me over the amount of paper I was getting through.

A few years ago now, I tried using my laptop. It’s a Surface Book Pro with a detachable screen so it can be used as a tablet. With a simple sketching app, it was fine – but there was still the hassle of getting it out, booting up, then detaching the screen, then reattaching it and powering down when I’d finished. There’s no way I wanted my Surface loose in the car while it was moving and quite frankly – in some of the places you have to cover – waving a two and a half grand laptop around is not the smartest thing you can do.

Then I had one of my thoughts. It occurred to me that there must be something out there that could just be used as a drawing board, but which didn’t involve dirty rags covered in black marker from the dry-wipe boards some people use. That was when I came across LCD drawing pads. At the time I first tried them, they were usually 6 inch or 9 inch screens. I found a 10 inch one and it worked great. I still have it, in fact. But a couple of years ago, while still looking for something better, I came across DoogleBooks.

The main attraction at the time was its size – it’s a 12 inch screen, so about the size of a piece of A4 paper. It also boasted an erase function (you can erase parts of your diagram with an eraser on the stylus) and a bright screen – my original cheap import was quite faint, though still perfectly usable. It comes with a padded protective case and a separate eraser, a lanyard for the stylus, and some spare tips, and a few bits and pieces for kids rather than adults (and which I never did figure out what they were for).

It is powered by – believe it or not – a standard watch battery, which lasts ages (I’m still on the original after nearly two years). That’s because the device is not illuminated in any way, so doesn’t draw much power.

You ‘turn it on’ with a very small switch on the back, though this is a ‘lock’ function rather than a power button as far as I can tell. The stylus clips neatly into the frame (come to think of it, it was because the clip on the cheap one I bought snapped which got me looking again) and has a nice long lanyard so you don’t lose it.

Once powered/unlocked you just write or draw whatever you want. The width of the stroke is governed by pressure and angle of the stylus nib, so you can get thin lines or thicker ones as needed. If you want to start again, you just press the button on the left in the picture above with the trash can symbol twice, and the screen is cleared. The double-press is a safety feature so you don’t erase by mistake – see the next bit for why.

If you make a minor mistake, you can erase just part of whatever you’ve drawn or written. Press the other button until the red LED comes on, then use either the small rubber eraser on the other end of the stylus, or the larger rectangular one which is supplied – just like you would with pencil on paper. Once you’ve erased whatever you want, press that button again until the LED goes out and you’re back in drawing mode. Due to the proximity of the buttons, you can see why complete erase needs two presses. This selective erase does work, but be aware it does leave slight smudges behind – again, like you’d get with a pencil on paper.

It is not a computer. Anything you write or draw exists only on the screen for as long as it’s there. You cannot transfer it to a computer, since it is not a digital image – it is exactly the same as a pen or pencil drawing. If you write ‘CAT’, that’s just some shapes and lines – the tablet doesn’t know what you’ve written. If you erase something by mistake, it’s gone forever – there’s no undo feature. If you want to save anything, you can take a picture – pupils often take a shot of things I draw so they can look at them later, just like they used to when I drew on paper.

The device I used previously had a much fainter screen, and this meant that on evening lessons it could be difficult to see what you’d drawn. As I explained earlier, there are no backlights on these things, and they are literally the same as pen and paper – you can’t see drawings made using those in the dark, either. However, DoogleBooks has a much brighter screen contrast and you can see your drawings clearly with the interior light on. The photo above was taken at dusk with no lighting, and that’s the contrast you get.

It’s been one of the best things I’ve bought in a long while. I actually have a spare in reserve, which came about because the original Amazon order never arrived, and the owner of the British company which sells them sent out a replacement. Several weeks later, the other one arrived – God knows where it had been – and when I offered to return it the owner said to keep it as a gesture of goodwill!

They now do several different models, mainly aimed at kids, with different screen colours. And whereas the only frame colour available when I bought mine was cyan (which is actually my least favourite colour in the whole world), they now do them in a range of colours. Just be careful to choose the ‘’partial erasure’ one unless you want to save a couple of quid and lose a bit of functionality.

It’s infinitely better than using a dry wipe board. There’s no mess, and it is ready to use the instant you take it out of its case. Unlike dry wipe systems, when you erase, you erase – no ink getting stuck in scratches, which always happens with dry wipe markers. And the stylus lasts oodles longer than a marker pen. And there’s no thick pads of drawings to dispose of when you’ve filled up a notepad.

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TV Licensing ScamJust a heads up on another silly attempt at scamming people over their TV licence.

I get one of these at least once a year and can spot them a mile off. This one (in May) came from postmaster@kuriya.jp, which is an automatic giveaway in the first place. The second clue is in that I know our licence is up to date. The third clue is that ‘TVLicensing’ and ‘TVLicence’ have no space, whereas the proper TV Licensing title does. Edit: I had another one in June, which I just binned, and another just now from ‘support@tvlicensing.co.uk.a’ (see the extra ‘a’ at the end?)

TVL will always use your full name in their own emails (this one had my email address), and they will always come from donotreply@tvlicensing.co.uk or donotreply@spp.tvlicensing.co.uk.

And never click on links from emails if you are unsure of them.

If I’m wrong, then I expect a visit from the Yakuza in the near future. I’m not especially worried.

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AUSDOM AW615Until I saw this article on the BBC, I had no idea there was a webcam shortage. But apparently, the lockdown has meant these, too, have been panic-bought into oblivion, and they are difficult to get hold of.

During the lockdown, I’ve been having a nightly Skype session with my mate who lives in Leeds. Initially, we were just doing voice, but he upgraded his laptop and we were then able to do video calls. However, although my Surface Pro laptop has a camera, I prefer to use my desktop.

Over the years I’ve had several webcams, but since I didn’t typically use them much they inevitably ended up being put in a box somewhere and forgotten about. They were always oddly-shaped things, too. All curves and funny angles – and far, far bigger than they needed to be. This time around, I started looking for a simply bullet-style camera that could sit on the top edge of one of my monitors without it wanting to break into a song and dance routine and flash pretty lights at me for no apparent reason if I was on Facebook or something. I also wanted HD.

One of my preferred brands is Logitech. However, their HD cameras have all the usual angles and curves, with the added ‘benefit’ of being the size of an iPhone thanks to whatever fancy additional features Logitech is trying to sell to nutjobs who post on Instagram and Tik Tok every five minutes. I just wanted a camera – I have a separate microphone, anyway.

After more searching I came across a camera that looked like exactly what I was after on Amazon. The AUSDOM AW615.

It’s full HD, does 16:9 widescreen, and it does have a microphone (it’s also manual focus and wide-angle). For me, the most important detail was it’s shape and size – the camera itself is a short cylinder, and it has a bendy clip and bracket so you can put it in different positions on different monitors or surfaces. At that time, the price was around £70 (at the time of writing it is on offer at £50), but what I did then was take a look on AliExpress. It was obviously (to me, anyway) a Chinese device, and it was carried by many sellers on AliExpress. if I bought direct it turned out the price was $33 (about £25). So that’s where I bought it from. Incidentally, if you check out any of the models above, they’re cheaper if you buy directly from China – but it’s up to you.

It took about three weeks to arrive, but lead times are always a little longer from China anyway.

It doesn’t need any software – you just plug it in and Windows does what it needs to do to recognise it. As with any webcam, you really need to connect it directly to a USB 2.0 port on your computer, and not through any daisy-chain of hubs. If you do that, you’re likely to get problems, especially with a HD image at 30fps, which is this camera’s spec.

It works like a charm. Nice sharp picture, and you can do all the things with it that Skype lets you – blur background, add image, and so on. My boom microphone is better for sound, but the microphone on it works perfectly well. Definitely worth considering if you’re after a webcam.

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ReadlyA couple of years ago I was having a clear out and I was amazed at the number of magazines I’d collected over the years. They were mainly my Classic Rock mags, and part of my decision to have a clear out was that I’d been getting more and more disillusioned with that particular publication.

At the time, I was on an annual subscription, but Planet Rock had just launched its own magazine and that did exactly what it said on the tin – it covered rock music. Classic Rock acquired a new editor, and she made it clear in her introductory piece what she was planning. Subsequently, any rock music they covered had to include at least half female acts – meaning it became obscure and far from ‘classic’, at best – and they also decided that (as just one example) Depeche Mode somehow ticked both the ‘classic’ and ‘rock’ boxes at the same time (actually, they decided twice in the space of just a couple of months with that one example). Then they did their ‘best 100 female artists of all time’ issue, and necessarily had to include non-rock genres to fill it out. That was it from me, and I cancelled my sub.

Before any feminists start frothing at the mouth over this, I go to see lots of female artists and bands with female members. I actually seek them out if I hear them on Planet Rock and like the sound. Like Samantha Fish, Haim, Paramore, Evanescence, Courtney Love, Joanne Shaw Taylor, The Lounge Kittens… I just don’t need any feminist magazine editors trying to filter out the men for me. And if you don’t like the fact that I don’t like that fact, click the back button and go somewhere else.

Planet Rock mag suits me fine, but when the lockdown came along, it also came with a lot of extra time for reading and finding tips on how to do stuff I wouldn’t have otherwise had time for. And going out to buy magazines wasn’t an option – even if it would have been of benefit with the ‘current’ issue on sale (you usually need a series of them).

A few years ago, as a result of my quest to find some authentic German food recipes, I came across a subscription service called Readly. It carries – and this is no exaggeration – thousands of UK titles. They’re all the ones you see on the newsstands (and many you don’t), from TV Times, OK!, Hello!, through all the photography and amateur DIY magazines, through to music and musicians (including Classic Rock). They cover specialist computer and technology subjects, gaming, weddings, cycling, fishing, horse riding, pets… everything (but no X-rated adult stuff). Including back issues, too, which multiplies the content by at least ten. And as I already implied, they have similar numbers of publications from Europe, Asia, and America. They’ve also recently started including newspapers, though it’s only The Independent and Evening Standard right now.

My normal Readly subscription is less than £8 a month, but they offer a two months for free trial. Even so, at £8 a month, that’s the newsstand cost of just three magazines! If you were after foreign magazines, you’d probably pay more than that for a single issue once shipping was included.

You can get the Readly app with the offer through Amazon (it’s free), and you can read on your phone, tablet, or computer. You can also read offline by downloading the content.

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The Chillmax AirI wrote this in the summer of 2019, but started to see blanket adverts for the device – or identical devices – in 2020. The prices are ridiculous in some cases.

Be aware that the device does not work to anything like the levels these ads claim. So be careful. The original article follows.

Early in July 2019, I saw the Chillmax Air advertised on TV in one of those shouty ads. Then, the same evening, I was shopping in Asda and saw it on display. I am an idiot for things like this, and bought it on impulse so I could test whether it worked or not.

As a chemist, I’m well aware that in order to cool a large space effectively you’re going to need something with a big fan and a special refrigerant. In practical terms, that means a fairly large device holding a motor-driven compressor, a closed radiator filled with the refrigerant, a fan to suck air in and blow it across the radiator, and a wide exhaust pipe through the wall or window to get rid of the “removed heat”. In many cases, you also need to collect or drain the condensed water that comes out of the air as it cools. A typical air conditioner for a small or medium-sized room will be about the size of bedside cabinet. The Chillmax Air is not much bigger than six CD cases glued into a cube.

If you’ve used a normal desk fan you will know that you only feel “cooler” if you’re sweating a bit. That’s because the fan evaporates your sweat as it pushes air over it, and that evaporation is accompanied by a small cooling effect – it’s called “evaporative cooling”. If you’re not sweating, you don’t feel any cooler. Conversely, if the surrounding air is very humid, then no matter how powerful your fan is, you will feel little or no cooling because sweat can only evaporate if the air has capacity to hold additional moisture (I’ll explain that a bit more later, because it is really the factor that determines whether the Chillmax is any good).

As an aside, many liquids exhibit the evaporative cooling effect. In the case of diethyl ether (the stuff they used to use as an anaesthetic), if you force it to evaporate very quickly you can even freeze water (if you do it properly). However, ether is both highly flammable and toxic, so apart from demonstrating it in the school lab (where I remember it from, along with the massive headache it gave me), it doesn’t have much practical application these days. Early refrigerators used it, which was spectacularly dangerous.

The Chillmax Air uses the evaporative cooling effect of water, and this is much less than with ether – similar to sweat, in fact. The unit consists of a reservoir at the top, which you fill with normal tap water, and this drips down on to a radiator unit which has ten sideways-stacked fibre panels in it through which a fan blows air. The water evaporates from the fibre panels, and the evaporatively cooled air comes out through the front grille. According to the marketing spiel on the TV ads, you’d be forgiven for thinking you’re going to get frostbite if you sit too close. I knew this wasn’t going to happen, but I wanted to know just how effective the Chillmax was.

When I first set it up and turned it on, the first thing I noticed was that the fan is quite powerful, so you get a good flow of air directed at you – but note that that it’s only about 5″ in diameter, so it can’t beat a proper desk fan for air flow. The air did seem a little cooler compared with what my desk fan was blowing at me, but it also felt ‘softer’ – that’s very important, and I’ll explain later. But the big question was how much cooler was the exhaust air?

I fired up my trusty data logger and left it in front of my desk fan for 30 minutes for the control data. Then I moved it and suspended it in front of the Chillmax for the same period of time. This is what it recorded (red line is the switch over point).

Chillmax - temperature log in hot and sticky conditionsThe ambient temperature where I ran the test was about 29ºC. The Chillmax brought this down by about 4ºC.

So, the Chillmax definitely cools the air that passes through it. Let’s work on the assumption that it would be able to get the same 4ºC drop no matter what the ambient temperature was. If your room is 38ºC, pulling it down to 34ºC still means it’s bloody hot. And also note that since the Chillmax is physically so small, the cooling is very localised – it won’t cool a room down.

But there’s more to it than that. I mentioned that the exhaust from the Chillmax felt ‘softer’. I knew what it was, but my data logger shows it in numbers.

These are is the data for relative humidity recorded at the same time as the temperature measurement, above (red line is the switch over). The humidity went up dramatically.

Chillmax - RH log in hot and sticky conditionsAs I’ve already explained, the Chillmax works by evaporating water on fibrous panels by forcing air across them. That water has got to go somewhere, and in this case it comes out as vapour in the cooled air. In the right light, you can actually see it – it’s essentially fog. And just like when it’s foggy outside, and everywhere gets damp, this vapour can condense on surfaces. My data logger collected some and began to drip during the test, and I have since discovered that it also condenses on the front grille and can drip periodically, so you’d need to be careful what you had underneath it if you placed it on a shelf. The fan is quite powerful enough to project the drips forward slightly when they drop.

The ambient humidity in the room where I did the test was about 44%RH. The Chillmax sent that up to over 70%RH.

It’s this elevation of the humidity of the cooled air which really brings into question whether the Chillmax is worth the investment. You’re probably aware that you can have a hot summer day in the high 20s where it is pleasant and comfortable, but a cooler and overcast day might be horribly sticky – or muggy. That’s because of the humidity, or water vapour in the air.

The amount of water vapour that air can hold varies with the temperature. Once you reach the maximum, any extra vapour condenses out – misted up windows, dampness, even drips and pools of moisture on window sills or under lamp posts. Cold air can only hold a small amount of moisture before condensation occurs, but hot air can carry much more. Although ‘humidity’ technically refers to the amount of water in the air, the figure most people are referring to when they say it is relative humidity. This is the amount of moisture in the air expressed as a percentage of the maximum amount it could hold at that temperature, hence the units %RH. It’s a very complicated subject, but the important factor for us here is that when it is warm or hot, higher relative humidity is uncomfortable. Indeed, you may have seen weather forecasts where they give the actual temperature and the ‘feels like’ equivalent – that’s a reference to the ‘heat index’, which takes into account the effect of the %RH. Here’s a graphical chart for that.

Heat Index - graphical representationAs an example, if the temperature is 30ºC and 50%RH, it will feel like 31ºC. If the humidity goes up to 80%RH, then it will feel like 38ºC. If the temperature is 35ºC at 50%RH, it will feel like 41ºC. But if the humidity goes up to 80%RH, it’ll feel like 57ºC! The calculation for this is complex (you should see how long my Excel formula for it is) and non-linear, and the increase in ‘feels like’ is greater at higher temperatures. It also contains an element of opinion/perception, which is why there’s no point using numbers above about 60ºC, but it is what the forecasters use. Incidentally, the official health designations for the colours are: yellow – caution; amber – extreme caution; orange – danger; and red – extreme danger.

This is where the problems come in for the Chillmax Air. If it’s 35ºC and 40%RH, it’ll feel like 37ºC. Cool the air to 31ºC and send the humidity up to 80%RH, and it’ll feel like 41ºC. So it’s actually hotter in terms of comfort. Do the same comparison when the surrounding temperature is 38ºC, and the ‘feels like’ goes from 43ºC to over 50ºC!

At lower temperatures the Chillmax will produce a slight net cooling effect, but at higher temperatures – the ones you likely to be wanting to use it in – it makes things worse. But even at these slightly lower temperatures, the full 4ºC drop is cut somewhat simply because higher humidity makes it feel warmer.

Proper air conditioners remove water from the air they cool – so much so that the best ones have humidifiers in them to stop the cooled air from being too dry. This removal of moisture is why the air from proper air conditioners feels crisp, as opposed to the ‘softness’ of moist air. The Chillmax does the opposite of normal A/Cs, and adds moisture.

Aesthetically speaking, the Chillmax is a cube – more or less – about 15cm along each side. There are two buttons on the top rear, one which changes the fan speed to one of three settings (or off), with a blue LED for each, and another button that turns the night light on or off. There’s a flap on the top front through which you add the water. The radiator system is a plastic-framed insert which you access by pulling the front grille out. It slots in and out easily. You can’t officially replace the fibre inserts in the radiator, but you can buy the whole radiator assembly from JML for £15. My only major gripe is the power cable. The jack plug that goes into the Chillmax is quite stubby and doesn’t go into the socket very far, so it is easy to dislodge it. However, the cable itself is quite long, and the  mains plug is a moulded UK type.

JML claims the Chillmax can run for up to 10 hours per fill, but this is undoubtedly on the lowest of the three fan speeds. At top speed, it runs out in less than three hours. To be fair to it, you do still get a cooling effect on the lowest speed, and since the water lasts longer then, less of it will be getting pumped into the air at any one time.  JML sells the humidification as a positive without relating it to the comfort relationship between temperature and %RH, but note what I said above. If you want to cool down in humid weather, it isn’t just the temperature that needs to come down, certainly not a mere 4ºC drop, and definitely not if that means pushing high humidity even higher.

Does it really work?

Well, it does cool the air by a few degrees, but it also sends the humidity up. So if it is already humid and sticky, the cooling effect is completely cancelled out by the extra stickiness. If it’s really hot, then no, it doesn’t work.

Will it cool more if I use ice water?

No. Evaporative coolers are not influenced significantly by the temperature of the water used in them. The temperature of the air that comes out depends on the temperature (and humidity) of the air going in, and the science of evaporation.

Can I use it to cool my PC?

Someone found this article on the search term “jml chillmax air for pc cooling”. If they mean what I think they mean, no, there is absolutely no way you want to be blowing damp air into your PC.

Can you get larger versions?

You can certainly get larger evaporative coolers. The working principle is that the larger the surface area of water, and the greater the airflow over that water, then the greater will be the possible drop in temperature at the front end. However, cooling effectiveness is influenced greatly by the RH of the air going in.

If the air is very dry, then a large evaporative cooler might be able to drop inlet air at 30ºC down by as much as 10ºC. However, if the inlet air is very humid, the temperature drop could be as little as 1ºC. In the UK, the realistic temperature drop you could expect on a non-humid day for a large cooler would be around 5-6ºC, but on a sticky day you’d only get about a 3ºC drop.

Suppliers of these devices say that they need good ventilation or extraction, and I would imagine that’s so the humid air can escape. If you’re evaporating more water to get better cooling on larger devices, you’re also producing a lot more water vapour. Be careful if you read any of the reviews – people may have noticed cooling in already cooler conditions, but trust me – if it’s very warm and humid, you will not notice any effect.

So, does the Chillmax work?

It cools the air by a few degrees. In that sense, it works. But it sends the humidity of that air up considerably, and this cancels out the benefits of the cooling effect in the instances where I tried it. The ‘heat index’ is the key issue, as explained above.

Only the air being directed at you is cooler. The device cannot cool down a room. It’s far too small for that.

The increased humidity does produce condensation, so you have to be careful to keep it away from electrical sockets where it might drip on them. The cooler also contains a fair volume of water when full, so you don’t want to knock it over.

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Fogged up windowsThis is an old article from 2013, but it is due an update. When I originally published it, one of the show-me-tell-me questions was:

Show me how you would set the demister controls to clear all the windows effectively. This should include both the front and rear screens.

At the time of updating, the relevant show & tell questions (they changed the name) are:

When it’s safe to do so, can you show me how you’d set the rear demister?

When it’s safe to do so, can you show me how you’d demist the front windscreen?

For the windscreen – that’s the one on the front of the car – the universally correct answer would be that you’d switch the airflow to blow out of the vents on the rear of the dashboard up at the windscreen, turn up the fan speed, and increase the temperature of the air from these vents. That would work for any car, although the actual knobs to twist and buttons to press will vary from model to model.

For the rear window, you’d turn on the electric heater that warms those little metal wires stuck to, or embedded in, the glass. There will be a button somewhere on the dashboard that turns it on and off.

You will note that the original broad question has now been changed to two rather more specific ones. This is relevant, because most newer cars also have air conditioning, electrically heated front windows, and often a button labelled as “MAX”, which turns everything on to demist all the windows very quickly at the same time. One press and you turn on the front and rear window electric heaters, the air conditioning, and redirect the hottest air possible at the windscreen (and often the side windows, as well, if your car has that feature).

When asked the original show-me-tell-me question, operating the MAX button was a perfectly correct response – as were playing around with the air flow controls, using the heated front windscreen if you had one, and turning on the rear window heater. However, with the much more specific Tell questions currently used, pushing the MAX button isn’t strictly the right response to either of them. It is also worth noting that whereas the original question would have been asked whilst stationary, if either of these new ones are asked, it will be while the candidate is driving. Ever since they started doing it this way, I’ve had nightmares about people fiddling with buttons and dials while taking a bend and losing control (I know the examiner would prevent that, but at the very least it would result in a test fail).

Arguably, operating the MAX button is a satisfactory response to either question, because it will achieve the desired result. But it is technically not the correct response if you’re being pedantic about it, because it does several other things at the same time.

It makes sense to understand all the controls rather than just blindly push buttons and twist knobs. If nothing else, if you inadvertently turn the car into a sauna, you ought to know how to turn the temperature back down again – and you’d be surprised by how many people can’t work out for themselves that if you turn something on by pressing a button or flicking a switch, you can usually turn it off by pressing the button again, or flicking the switch the other way. It also means that if you respond to the examiner’s question by pressing the MAX button, you’ll probably be able to recover if he specifically asks you to demist either the front or back – but not both.

How does the air-blower demist windows?

It involves a bit of science, but it is enough to know that hot air will demist windows, whereas cooler air probably won’t.

The reason it works is down to relative humidity. Air can hold water vapour as a gas, but if the amount of vapour reaches the maximum that the air can hold, it precipitates out – condenses – as water droplets. That’s the “mist” on the glass. The problem is that the maximum amount of vapour the air can hold before condensation occurs gets less and less the colder the air is. If you refer to water vapour in air as the “humidity”, then the amount of vapor relative to the maximum possible is the “relative humidity”. In summer, a relative humidity (RH) of 70% might feel horribly sticky and sweaty – but there’d be no condensation. In winter, you can easily get 100% without feeling it because there’s a lot less moisture there– but since there’s no room for any more vapour in the air, any extra causes condensation to take place. Think of it as a bucket overflowing, where the colder it is, the smaller the bucket is.

What happens is that on cold mornings, with the air at – or very closer to – 100% RH, as soon as you get in the car, breathing and perspiring, you overflow the bucket and condensation takes place. You see it on the glass as mist, but everywhere feels slightly damp. When you initially turn on the heater, it is blowing cold air, and if anything you get even more misting. But as the car warms up, it starts to blow warmer air. This warm air can hold more water vapour, and it evaporates the mist as it blows across it and keeps hold of it.

What does the air conditioning do?

Air conditioning (A/C) units pass the air over a radiator filled with coolant – just like what you have in your fridge at home. If you look back at what I said about humidity, above, you can probably work out that if you cool very moist air, you send it above 100% RH. The excess moisture – and if you cool humid air at 30°C down to 8°C, there’ll be a lot of it – condenses out (usually as a pool of water under your car in summer if you’re stopped), and much cooler and drier air is blown into the car. You can play around with the temperature of the air that is blown in by passing it over the heater radiator, so you have crude climate control.

Since it removes moisture, A/C is extremely efficient at demisting and preventing further misting.

How do the heated windows work?

In a similar way to the air blower. As they heat up they create an area around the metal wires which is warmer and so the mist evaporates back into the air. They work best in conjunction with the car heater, which heats the bulk of the air in the car, and which can then keep hold of the vapour, preventing condensation. They work even better with the A/C, because it strips the vapour out and dumps it outside the car. The MAX switch activates everything in one go.

How do you control these features?

It varies from car to car, but for the heater blower, there will be several rotary controls usually located in the centre of the dashboard and below the level of the steering wheel.

Heater controls

One of them controls the speed (and noise) of the fan, one controls the temperature (blue is cool, red is warmer), and another allows you to select which vents and grilles the air will be blown through (at your feet, at your face, at both, or at the windscreen – possibly with other combinations).

Higher spec cars may have digital temperature displays, and some will have independent control for each side of the car. Some will even have controls in the rear for back seat passengers.

Heated Front Window Symbol

Heated Rear Window SymbolThe heated rear window button will have an icon like the one on the left, and the heated front windscreen will have one like that shown to the right.

The air conditioning will be activated with a button or switch marked A/C, and the MAX button (which activates all of these features) may also have one of the window icons.

Isn’t the heated windscreen for de-icing?

Not specifically, no. It serves the exact same purpose as the heated rear window – to demist. However, every demisting feature in the car can also de-ice if necessary. Even blowing cold air can lead to de-icing if it isn’t too cold, because the air passing through even a cold car is still warmer than that outside. However, a heated front window is noticeably useful at de-icing since that’s the very window that needs de-icing the most.

Having said that, a heated windscreen is only good at melting frost or dislodging a thin layer of rimed ice. If you think it’s going to get rid of a couple of inches of snow, think again. It doesn’t actually get that hot – if it did, it could cause the glass to shatter.

Why do my windows steam up in summer if it’s been raining?

That’s because water cools as it evaporates. If it’s already humid when it rains, the air passing over the windscreen evaporates the rain drops, so you get cooling around them. The humid air inside the car is then above 100% RH close to these spots on the windscreen, and condensation occurs. You usually see it around spots of rain.

You can also get it if you’ve had the A/C on. It cools the windscreen right down, so when you turn the A/C off and humid air gets back in, the cold zone near the glass sends the RH there above 100% and condensation occurs. In this case, misting is more uniform, but often concentrated on the lower part of the windscreen where the A/C has been blowing.

So what should I tell the examiner on my test?

Your best bet is to answer the question he’s asking you. If he asks how you demist the back window, operate the heated rear window switch or button. If he asks how to demist the front, either demonstrate how to redirect the air flow and increase the temperature and fan speed, or operate the heated windscreen button or switch (if your car has it).

In Nottingham, examiners have not been querying use of the MAX button, so use it by all means – but just make sure you know how to activate just one of the features as necessary if your examiner presses you on the subject. You are being tested on “safe driving for life”, so you ought to know what the buttons do anyway – you’re going to need to if you pass.

Since these questions are asked while you’re driving (and since you’ll be driving when you use them once you pass), be careful not to stare down and lose control of the car.

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Ford Focus One-Touch Window ButtonsMy Focus has one-touch electric windows. On my last car, shortly before it was due for a service, the driver-side window developed a fault whereby when it was closed and hit the top of the frame, it bounced half way back down. What I had to do was carefully inch it up and make sure it didn’t hit the top each night when I got home and locked it up. There was still a small gap, though, but it had a service booked and we had no rain, so it wasn’t an issue.

The dealer fixed it and simply said it had been “reset”. I had no further problems with it.

I have another car now, and it has started doing the same thing. It isn’t anywhere near ready for a service yet, so in order to avoid the inevitable assessment visit and probable brake bleed my dealer would insist on before fixing it under warranty, I looked into it a little further. And big surprise, it is quite common on Fords (and other makes, apparently).

From what I can gather, the reset procedure is to put the window all the way up holding the button, and then keep it held for 3 seconds. Then, push the button and put the window all the way down, then keep it held for another 3 seconds.

But that doesn’t work by itself, because as soon as the window hits the top of the frame, down it comes again. It seems to be connected with the safety feature that prevents idiot kids (and dogs) getting their heads squashed if the window goes up while they’re leaning out. A sensor detects the resistance and winds the window back down again.

The trick is to use a piece of paper or thin card when you do the reset. Hold it just under the top window frame recess and put the window up. Hold the button for 3 seconds. The paper acts as a cushion and prevents the sensor triggering. Now put the window down and hold the button for 3 seconds. That should now have reset the sensor and the window goes up and stays up.

It ought to go without saying – but I’d better say it anyway – do not use anything hard as your cushion, otherwise you’re likely to break the glass. Use paper, and fold it once or twice as necessary to get enough cushioning to stop the auto-retraction kicking in while you do the reset. And keep your bloody fingers out of the way when you’re doing it. Don’t say I didn’t warn you!

My windows bounce back when they reach the top

You may have a faulty motor or sensor, but from my experience it is most likely just needs a reset. Follow the instructions above. That should reset it.

My windows come down on their own

I have read that on some models there is a feature which automatically opens the windows when it gets hot – even when it is unattended, and sometimes in the middle of the night. I have also read that the windows in some cars can be controlled from the key fob, and this can get pressed whilst in someone’s pocket. The sources for this are various web forums, and are not really to be trusted, but even if such a feature existed, I can’t believe that would be available in the UK because the car would get stolen almost immediately in some areas.

It is possible you need to do the sensor reset without knowing it, and the windows actually opened before you locked it up but you didn’t notice. That’s just a thought, and I’m not saying it’s right. But the first time I experienced the bounce back I didn’t realise until I went out again and saw the window open.

If I woke up to open windows, I’d book it into my dealer pronto.

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Li-ion generic batteryI’ve had a Nextbase 612GW – Full 4K Ultra HD Resolution DVR In-Car Dash Camera – 150° Viewing Angle – WiFi and GPS – HDR and WDR Recordings – Anti-Glare Polarising Filter – Black for over a year now (that’s the Amazon link there). It records in 4k – meaning that you can see number plates and other details much further away and much more clearly than on other dashcams.

I’m actually on my second unit. Within a year, my first one stopped turning on automatically, and after discussions with Nextbase, they gave me an authorisation code so that Amazon would accept the return and refund me. I bought another in lieu of the refund.

What had happened was that the internal battery had died. It would barely run for 30 seconds after a four hour recharge, and since it is the battery that provides the camera with enough residual power to detect when the power systems in the car are activated (which tells it to turn on and start recording), it was kaput. It worked perfectly if I powered it on manually each morning once a bit of charge had gone to the battery, but any power down lasting more than an hour and the battery would drain again.

Any 4k video device right now gets warm when it is in use, and the 612GW is no exception. I wouldn’t say it gets hot, but certainly very warm, and with the summer we had in 2018, it got warmer still. Li-ion and Li-Po batteries are degraded by high temperatures, and I suspect that overall this contributed to the battery going as quickly as it did. OK, it may also have been a bad batch (or just a bad one in my case), but I didn’t go into that with Nextbase. I’d had it replaced, after all.

It is worth noting that Nextbase told me replacing the battery is quite easy, and they supply them if you ask. It does involve a bit of soldering, but I will bear it in mind for the future.

As I understand it, some cheaper dashcams use a capacitor to hold residual power. However, where a battery is involved, this problem of degradation could occur with any model of camera. Indeed, any battery-based dashcam will effectively “break” sooner or later once the battery dies. Exactly the same thing happens with laptops, phones, and tablets – and it is amazing how many people don’t realise it’s just a dud battery which, in many cases, could easily be replaced. It even used to happen with desktop computers, when the coin battery which held the BIOS settings that enabled the PC to boot died (I’ve replaced a fair few of those in the past for people who thought their PC was broken).

I suspect that a lot of the complaints you see about dashcams dying could be a result of this – along with using the wrong types of SD card.

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Dilbert scam cartoonThere was a news item on the BBC earlier, which is covered by this article on the BBC website. It tells of an elderly chap, Doug Varey, who saw a pop-up on his computer offering security protection for 12 years at a cost of £556.

A couple of weeks ago, I got an email from TV Licensing (dated 11 October), informing me that my TV licence payment hadn’t gone through, and that I needed to pay before 13 October, otherwise they’d set the debt collectors on me. Within two seconds I had mouthed “f**k off” and clicked the spam button. Then there’s the Virgin Media emails saying much the same thing. And the Sky ones. And don’t even get me started on the avalanche of emails I get telling me I’ve won an Amazon/Iceland/M&S/Sainsburys/Tesco/Argos/etc. gift voucher. Or the latest one where I’ve apparently won a Kia. I’ve had spoofed bank ones before. Even the pop-up ones like that which snared Doug Varey have cropped up from time to time.

The scammers will get nothing out of me. Unfortunately, they rely on people like Doug Varey – and the “thousands” of others who fall for it.

I use Bitdefender Total Security. It alerts me if I go to an infected website, automatically scans anything I download, and prevents any installed software from accessing protected folders unless I tell it otherwise. It also has ransomware protection and spam filtering among a host of other stuff. It doesn’t slow my computer down. And it costs £20 new on Amazon. It is updated frequently with the latest virus definitions.

Over 12 years, Bitdefender would cost me £240. And yet Doug Varey is quoted in that BBC story:

I thought per year, that’s [£556 is £46 a year] quite cheap. And I agreed to sign up for it.

It isn’t cheap in any shape or form. Even more so when you consider that once he’d paid, they then appear to have accessed his computer and forced him to cough up another £4,000 to remove an alleged hacker.

I have a coffee cup with the Dilbert cartoon above on it. Never was anything so true.

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NextBase dashcamA bit of advice to anyone using a dashcam. I see a lot of people complaining that theirs is playing up, and other advice to regularly reformat the card – which seems to get a lot of people recording again. I strongly believe that part of the problem is with the card, and not the dashcam. Specifically, people are using the wrong cards.

I have always used SanDisk Extreme cards in my dashcams, and I have not had any problems. Extreme cards are not the cheapest, either. They’re pretty high spec. However, I recently wrote to SanDisk and asked them if Extreme cards were OK to use in such applications. Here is what they replied:

Thank you for contacting SanDisk® Global Customer Care. Please allow me to inform you that for Dashcams & security surveillance cameras, we recommend to use SanDisk® High Endurance Memory Cards since these cards are specially developed for high endurance applications and continuous read & write cycles. These cards are built for and tested in harsh conditions and are temperature-proof, shock-proof and waterproof.

Also, please be informed that using Extreme or Ultra line memory cards on these devices void their warranty.

At this point, it is worth noting that “high endurance” cards are special cards. They’re not easy to get hold of except through specialist suppliers, and your local Currys is unlikely to have them in stock. They cost more than normal cards.

But the upshot is that using Extreme (i.e. high-end “normal”) cards puts them under stress that they’re not designed for. It voids their warranty, but – more importantly if you read between the lines – there is a good chance they will malfunction or play up. I don’t know much about cards from other manufacturers, but I would lay odds that most people with dashcams are using the cheapest card they can find, and that means they’re not “high endurance” types. Most of the time I see people asking what dashcam to choose they always want a cheap one, and the one they end up buying often costs them less than I pay for a SanDisk Extreme card – so there’s no way they’re going to buy a card even close to that.

My current dashcam is the NextBase 612GW. It records in 4k, and on cards up to 128GB (so I get about six hours of footage in a run).  I have never had any problems with Extreme cards, but after the SanDisk advice I invested in a Samsung 128GB high-endurance card.

NextBase doesn’t seem to want to enter into discussion over this and insist that all their devices work with Extreme cards. Their own branded cards appear to be rebranded SanDisk ones. I don’t disagree that Extreme cards have worked well for me, and probably for everyone else when they’re new. But the niggling problems people keep reporting might not be doing NextBase any favours, because I firmly believe that a lot of the reported “faults” are down to those cards protesting at being used outside of their specification, with the user blaming the dashcam.

SanDisk high endurance cards only go up to 64GB at the moment (SanDisk said they’d feed back to their technical people on that), though other manufacturers (e.g. Samsung) produce higher capacity units.

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