Too Busy For Words - the PaulWay Blog

Fri 19th Sep, 2014

Learning as we go

Today I broke my record for distance on the electric motorbike: 70km on a charge.

The battery at the end of that was at 121.8V, which is about 3.2V per cell, and the lowest cell was 3.16V. Watching the voltage as I was riding (taking quick glances) showed that even under load it wasn't dipping below 110V, so there's a good chance that most cells were still running just fine. It's possible that there's a cell with lower capacity, but I think as I ride it and the battery gets more chance to level out I'm actually improving its range.

Unfortunately the battery meter on the bike thinks that power is leaking out when it isn't, so that doesn't tell me much. The meter on the BMS read "0%" at 38Km (the last time I read it) and "0%" before I started charging it, so I have no idea whether that's being caused by a low cell or some other random error. Either way, it's still trial and error to see how much distance I can actually get out of the battery.

According to the meter on the wall socket, that was half a kilowatt-hour. According to my calculations, that was about 11 amps at 120 volts over four hours, so about five kilowatt-hours. Either the decimal point is wrong on the meter and it's an order of magnitude too low, I'm reading it wrong, or it's just plain incorrect. Five kilowatt-hours is in the right ball park. At $0.17 per kilowatt-hour I just paid 89 cents to fill up the bike. So it's about 1.2 cents per kilometre, at this rough guess.

Interesting!

The other amusing thing is that I'm having to get used to coming back to the bike to find people peering intently at it. Fluoro-clad workers, motorbike enthusiasts, general passers by - I get all types. There are still lots of people who walk on by, so I don't think I've really changed the planet. But it's still fun to explain it and to see people's different reactions, all without exception positive. That's pretty cool.

Last updated: | path: personal / ebike | permanent link to this entry

Mon 4th Aug, 2014

Stop the unemployed

I think there's quite a simple answer to why the Coalition is putting so much effort into punishing the unemployed: it's exactly the same as their "stop the boats" policy. If they make it so unattractive to actually register as unemployed (in order to get Centrelink benefits) then a lot of people will just not register. They'll look for work, and they'll depend on the charities and on other forms of income (begging, stealing, etc), but they won't show up in the books as unemployed. Instantly, unemployment goes down, the Coalition looks like it's "tough on dole bludgers", and someone else foots the bill.

I've been there. I was unemployed for six months in late 2000. I tried to get benefits, and after spending every day trying to find work so that I could tick off my twenty-five job searches a month I was told that since I had shares I didn't qualify for assistance. In other words, you can't save, you can't have any reserves, you have to be scraping the bottom of the barrel yourself before you get any money from the Government.

So I just didn't bother. I didn't show up to Centrelink again, and they (presumably) removed my name from the list of unemployed. Howard at that time was trumpeting the work he was doing to reduce unemployment and kept pointing to the unemployment figures. No-one looked at the number of jobs at the same time. I think a few people pointed out at the time that the worse of his policies - which match those of the Coalition today - were just designed to punish the unemployed and make them into a cheap work force rather than actually get more jobs.

It's especially poignant since the Coalition also wants to sign into law trade partnerships that send jobs overseas (by making it uneconomical to manufacture things here in Australia), denying climate change and cutting spending on renewable energy (stopping the entire renewable energy sector from investing and thus losing jobs), cutting funding for education and health (as if States are suddenly going to find that money somewhere - more jobs lost), and telling Toyota and Holden that they get nothing to keep people employed here in Australia.

It's been well pointed out that there only about 146,100 jobs for 741,700 unemployed people. But the government's own way of calculating this only thinks a person is unemployed if they actively looked for work in the week of being surveyed - they identify an entire group called "currently inactive (not in the labour force)" and then coyly ignore that group entirely, not even mentioning it on the page.

That group comprises a lot of people, some of who need help. It's the long term unemployed who have given up on the mindless form-filling, tracking and justification required for government payments. It includes mothers who stay at home full time to care for their children (which is a full time job in my opinion). It includes lots of disabled people. It includes people on pensions. And it's that group that seems to be conveniently ignored by the Coalition in their War On Bludgers.

Last updated: | path: society | permanent link to this entry

Wed 9th Jul, 2014

New web server, same old content.

Over the last couple of years I've been implementing bits of my website in Django. Those initially started on my home server, and recently I moved them to a test domain on the new server my web host provided. Then they advised me that their old hardware was failing and they'd really like to move my domain off it onto the old one.

So I took backups, and copied files, and wrote new code, and converted old Django 1.2 code which worked in Django 1.4 up to the new standards of Django 1.6. Much of the site has been 404'ing for the last couple of days as I fix problems here and there. It's still work in progress, especially fixing the issues with URL compatibility - trying to make sure URLs that worked in the old site, in one Perl-based CGI system, work in the new site implemented in Django with a changed database structure.

Still, so far so good. My thanks once again to Daniel and Neill at Ace Hosting for their help and support.

Last updated: | path: tech / web | permanent link to this entry

Fri 11th Apr, 2014

Sitting at the feet of the Miller

Today I woke nearly an hour earlier than I'm used to, and got on a plane at a barely dignified hour, to travel for over three hours to visit a good friend of mine, Peter Miller, in Gosford.

Peter may be known to my readers, so I won't be otiose in describing him as a programmer with great experience who's worked in the Open Source community for decades. For the last couple of years he's been battling Leukaemia, a fight which has taken its toll - not only on him physically and on his work but also on his coding output. It's a telling point for all good coders to consider that he wrote tests on his good days - so that when he was feeling barely up to it but still wanted to do some coding he could write something that could be verified as correct.

I arrived while he was getting a blood transfusion at a local hospital, and we had spent a pleasurable hour talking about good coding practices, why people don't care about how things work any more, how fascinating things that work are (ever seen inside a triple lay-shaft synchronous mesh gearbox?), how to deal with frustration and bad times, how inventions often build on one another and analogies to the open source movement, and many other topics. Once done, we went back to his place where I cooked him some toasted sandwiches and we talked about fiction, the elements of a good mystery, what we do to plan for the future, how to fix the health care system (even though it's nowhere near as broken as, say, the USA), dealing with road accidents and fear, why you can never have too much bacon, what makes a good Linux Conference, and many other things.

Finally, we got around to talking about code. I wanted to ask him about a project I've talked about before - a new library for working with files that allows the application to insert, overwrite, and delete any amount of data anywhere in the file without having to read the entire file into memory, massage it, and write it back out again. Happily for me this turned out to be something that Peter had also given thought to, apropos of talking with Andrew Cowie about text editors (which was one of my many applications for such a system). He'd also independently worked out that such a system would also allow a fairly neat and comprehensive undo and versioning system, which was something I thought would be possible - although we differed on the implementation details, I felt like I was on the right track.

We discussed how such a system would minimise on-disk reads and writes, how it could offer transparent, randomly seekable, per-block compression, how to recover from partial file corruption, and what kind of API it should offer. Then Peter's son arrived and we talked a bit about his recently completed psychology degree, why psychologists are treated the same way that scientists and programmers are at parties (i.e. like a form of social death), and how useful it is to consider human beings as individual when trying to help them. Then it was time for my train back to Sydney and on to Canberra and home.

Computing is famous, or denigrated, as an industry full of introverts, who would rather hack on code than interact with humans. Yet many of us are extroverts who don't really enjoy this mould we are forced into. We want to talk with other people - especially about code! For an extrovert like myself, having a chance to spend time with someone knowledgeable, funny, human, and sympathetic is to see sun again after long days of rain. I'm fired up to continue work on something that I thought was only an idle, personal fantasy unwanted by others.

I can only hope it means as much to Peter as it does to me.

Last updated: | path: tech | permanent link to this entry

Tue 11th Feb, 2014

The Day We Fight Back?

I've blacked out mabula.net and my partially complete Django replacement for it as part of:

The Day We Fight Back.

It's a token gesture, and I'd prefer something that actually causes a real change in the state of affairs. But hopefully the few people that visit my site will ask why its blacked out, and I'll tell them. Or they'll find out why for themselves. Or they'll know already.

Ultimately, the thing that worries me in all of this is that all the data collection, all the wire tapping and interception, all the bad cryptography and bastardised standards, all the spying and all the secrecy doesn't really improve our actual security. It hasn't found anything that normal detective work and normal policing and existing laws couldn't already deal with. It hasn't prevented any crimes, either against real people or against 'the state' or anything.

The 'baddies' are already adapting their methods and covering their tracks. There are far too many false positives, and much too much confirmation bias, to make the resulting 'intelligence' anything but a joke. The FBI already spends more money on covering up its mistakes - like its total waste of resources watching Brandon Mayfield - than it would if it had just asked him for an interview. Mean time they're missing the Boston Marathon bombers despite lots of evidence pointing to them. Then follows a lot of chest puffing and excuses and "we can't tell you the details, they're classified".

(Meanwhile, we have banks that are laundering money to supply to exactly the same terrorist organisations that get a slap-on-the-wrist fine and no jail time for anyone because they're "too big to fail". So not only did the NSA and all the security TLAs not find a massive source of funding for these organisations - something that's causing far more damage to USAdian society than 'terrorism' - but the entire rest of the government quietly brushed it under the carpet and pretended it didn't happen. Yeah, good one.)

Ultimately, all it's really about is perpetuating the existince of the security complex - mainly in the USA, but everywhere really. Its first imperative is to preserve itself, and it has all the means to do so. It has the secret courts and the secret laws to prevent legal challenge, and the arms and the blackmail material to prevent other attacks. And its paranoid level of secrecy and security makes it automatically treat any rein, any check on it, as a threat to its own existence - because, well, it would be.

So what REALLY scares me is that nothing we do will actually stop them at all. At this stage, it's basically impossible to even rein in the NSA's powers - and that'd be like taking a rabid tiger and smacking it on the nose to tell it to go away. To put in the high-level open oversight that lets the public see whether these agencies are actually doing anything useful with the vast quantities of money they control is a task that's beyond the realistic abilities of any government (to say nothing of the blackmail and subversive influence that any security agency can bring against anyone that wants to downsize them). Tackling the companies who run the prisons and supply the equipment and make a profit from all the unrest - that's just bordering on insane.

We've made the tiger, and we've fed the tiger because it said it would protect us, and we're on its backs because it's better than being in its jaws, and we've fed it more because we're afraid it might eat us, and it's only grown larger and hungrier. To be honest, I think the security complex will kill the world before climate change does.

Last updated: | path: society | permanent link to this entry

Wed 15th Jan, 2014

Ignorable compression

On the way home from LCA, and on a whim, in Perth I started adding support for LZO compression to Cfile.

This turned out to have unexpected complications: while liblzo supports the wide variety of compression methods all grouped together as "LZO", it does not actually created '.lzo' files. This is because '.lzo' files also have a special header, added checksums, and file contents lists a bit like a tar file. All of this is added within the 'lzop' program - there is no external library for reading or writing lzo files in the same way that zlib handles gz files.

Now, I see three options here:

Yeah, I'm going for option one there.

LZO is a special case: it does a reasonable job of compression - not quite as much as standard gzip - but its memory requirements for compression can be miniscule and its decompression speed is very fast. It might work well for compression inside the file system, and is commonly used in consoles and embedded computers when reading compressed data. But for most common situations, even on mobile phones, I imagine gzip is still reasonably quick and produces smaller compressed output.

Now to put all the LZO work in a separate git branch and leave it as a warning to others.

Last updated: | path: tech / c | permanent link to this entry

Sun 24th Nov, 2013

Pity the people on Lord Howe Island

I've just come back from a week holiday on Lord Howe Island. It's a beautiful and fascinating place, with heaps of great snorkelling and diving spots, amazing palm trees (the Kentia Palm being the most well known) and other wildlife, and a wonderfully relaxed attitude to life. But Islanders have a few problems that we rarely hear about.

Pretty much all food is expensive. They're just in the process of setting up their own small abbatoir, which will allow them to serve local meat at Australian food safety standards. Fish is caught locally (outside the protected areas, of course), but is variable - some times they have to serve frozen fish caught days or weeks ago. There are a few people gathering chicken eggs, available at the local co-op store.

Everything else is brought in via ship. It costs about $540 per cubic metre - much, much more if you need it to be refrigerated or frozen in transit. Ice creams typically cost $6 to $8, a half round of White Castello cheese costs $14.60, and we had the smallest roast chicken you'd ever seen for $20. Even self catering is reasonably expensive here. Likewise, all fuel, all cars, pretty much all building materials - all are shipped here from the mainland. Mail day is pretty spectacular.

I don't know what electricity costs on the island but it's main supply is a series of diesel generators. Wind, wave and solar power are being investigated but the impact on the views and possibly wildlife is considered a downside (although I'd argue that they need to think differently; bird deaths due to wind turbines are much lower than you'd think and I for one would love to see a couple of wind turbines on Transit Hill or in some of the valleys, providing good clean energy). All power lines are underground, which I think is great, and street lighting is kept to a minimum (partly to save power, partly to not interfere with the many bird species here). The other complication with renewable energy is that there's simply not enough base load and not enough distribution to mean that the variable power supply can easily be used. Wind is OK when you've got hundreds of turbines spread across a state, but not so good if they're all concentrated in a square kilometre area.

But the real reason you should pity Lord Howe Islanders is their internet connection.

There is no undersea fibre-optic cable running here. One was connected to Norfolk Island, 700km east, but they didn't connect Lord Howe Island (for some unknown reason). So all internet connections are via satellite. One of the two satellite companies servicing the island decided to stop service, and only took some of their existing customers back at higher cost and reduced rate of data. The other is not taking any new customers. The NBN satellites are already oversubscribed - so "satellite internet" for regions may already be bad - which means that Lord Howe Island has no option for new internet connections. There are only a few satellite uplinks to serve the entire population, so link congestion is high.

What does this mean? It means studying, getting email, and even getting basic information takes a lot longer. It's costly and unreliable. You could do great business on LHI - selling Kentia Palm seedlings (which used to be the main business on the island), for instance - except you can't do it using the internet and compete with other sites on the mainland. Keeping in touch with children - most go to boarding school on the mainland - is slow and some things like video calls are impossible. So many things we take for granted on the mainland, things that are possible with 3G connections and "just work" on ADSL, just do not work at all on the island. Bufferbloat is crippling here.

The islanders are already conversing with Malcolm Turnbull about capacity of the NBN satellites and getting better speed. But I can see how easily it's overlooked - the problems experienced by 300 people and their 330 or so guests can look small beside an electorate of 100,000 or so. The pity to me is that the internet is a great opportunity giver. People can run businesses, find help, and get opportunities to better themselves (almost) regardless of where they are. My trip to Lord Howe Island has really shown how much we can take for granted the availability of information that the internet brings.

Last updated: | path: society | permanent link to this entry

Thu 31st Oct, 2013

Converting cordless drill batteries

We have an old and faithful Ryobi 12V cordless drill which is still going strong. Unfortunately, the two batteries it came with have been basically killed over time by the fairly basic charger it comes with. I bought a new battery some time ago at Battery World, but they now don't stock them and they cost $70 or so anyway. And even with a small box from Jaycar connected to the charger to make sure it doesn't cook the battery too much, I still don't want to buy another Nickel Metal Hydride battery when all the modern drills are using Lithium Ion batteries.

Well, as luck would have it I recently bought several LiIon batteries at a good price, and thought I might as well have the working drill with a nice, working battery pack too. And I'd bought a nice Lithium Ion battery balancer/charger, so I can make sure the battery lasts a lot longer than the old one. So I made the new battery fit in the old pack:

First, I opened up the battery pack by undoing the screws in the base of the pack:

There were ten cells inside - NiMH and NiCd are 1.2V per cell, so that makes 12V. The pack contacts were attached to the top cell, which was sitting on its own plinth above the others. The cells were all connected by spot-welded tabs. I really don't care about the cells so I cut the tabs, but I kept the pack contacts as undamaged as possible. The white wires connect to a small temperature sensor, which is presumably used by the battery charger to work out when the battery is charged; the drill doesn't have a central contact there. You could remove it, since we're not going to use it, but there's no need to.

The new battery is going to sit 'forward' out of the case, I cut a hole for my replacement battery by marking the outline of the new pack against the side of the old case. I then used a small fretsaw to cut out the sides of the square, cutting through one of the old screw channels in the process.

I use "Tamiya" connectors, which are designed for relatively high DC current and provide good separation between both pins on both connectors. Jaycar sells them as 2-pin miniature Molex connectors; I support buying local. I started with the Tamiya charge cable for my battery charger and plugged the other connector shell into it. Then I could align the positive (red) and negative (black) cables and check the polarity against the charger. I then crimped and soldered the wires for the battery into the connector, so I had the battery connected to the charger. (My battery came with a Deanes connector, and the charger didn't have a Deanes connector cable, which is why I was putting a new connector on.)

Aside: if you have to change a battery's connector over, cut only one side first. Once that is safely sealed in its connector you can then do the other. Having two bare wires on a 14V 3AH battery capable of 25C (i.e. 75A) is a recipe for either welding something, killing the battery, or both. Be absolutely careful around these things - there is no off switch on them and accidents are expensive.

Then I repeated the same process for the pack contacts, starting by attaching a red wire to the positive contact, since the negative contact already had a black wire attached. The aim here is to make sure that the drill gets the right polarity from the battery, which itself has the right polarity and gender for the charger cable. I then cut two small slots in the top of the pack case to let the connector sit outside the case, with the retaining catch at the top. My first attempt put this underneath, and it was very difficult to undo the battery for recharging once it was plugged in.

The battery then plugs into the pack case, and the wires are just the right length to hold the battery in place.

Then the pack plugs into the drill as normal.

The one thing that had me worried with this conversion was the difference in voltages. Lithium ion cells can range from 3.2V to 4.2V and normally sit around 3.7V. The drill is designed for 12V; with four Lithium Ion cells in the battery, it ranges from 14.8V to 16.8V when fully charged. Would it damage the drill?

I tested it by connecting the battery to a separate set of thin wires, which I could then touch to the connector on the pack. I touched the battery to the pack, and no smoke escaped. I gingerly started the drill - it has a variable trigger for speed control - and it ran slowly with no smoke or other signs of obvious electric distress. I plugged the battery in and ran the drill - again, no problem. Finally, I put my largest bit in the drill, put a piece of hardwood in the vice, and went for it - the new battery handled it with ease. A cautious approach, perhaps, but it's always better to be safe than sorry.

So the result is that I now have a slightly ugly but much more powerful battery pack for the drill. It's also 3AH versus the 2AH of the original pack, so I get more life out of the pack. And I can swap the batteries over quite easily, and my charger can charge up to four batteries simultaneously, so I have something that will last a long time now.

I'm also writing this article for the ACT Woodcraft Guild, and I know that many of them will not want to buy a sophisticated remote control battery charger. Fortunately, there are many cheap four-cell all-in-one chargers at HobbyKing, such as their own 4S balance charger, or an iMAX 35W balance charger for under $10 that do the job well without lots of complicated options. These also run off the same 12V wall wart that runs the old pack charger.

Bringing new life to old devices is quite satisfying.

Last updated: | path: tech | permanent link to this entry

Mon 16th Sep, 2013

A Glut of Music?

I finally read David Gerard's original article, and I have to say there were some pretty sweeping assertions in there. Mainly that quantity always trumps quality, every time, no exceptions. That, personally, I think is ... a bit overstated. There are plenty of examples of people still liking the old quality stuff over the new quantity stuff - my nieces love my Eighties music just as much as they like the new popular hits. And plenty of people still listen to classical music and are interested in music that is strictly of fixed quantity - Beethoven sonatas, for example.

The other big generalisation is that this works purely on a cost amortisation calculation. I.e. that musicians are trying to cover costs, and therefore the cost of producing physical units and distributing them is the governing factor. Some musicians also look to make a living from their work, and that means setting a time period over which they hope to gain money from selling the product, an amount which they expect to live on, a number of units to sell, and so forth - all of which can vary widely and are complicated to fix. (Aside: this is why established artists push for extension to copyright - because theoretically they're extending the amount of time they gain from selling that product. This is a myth and a fairy story record labels tell them when they want them to support copyright extension.) It used to be that the cost of producing the units and distributing them were the major costs - see Courtney Love's calculation, for example - and therefore the label proposes to take that risk for the band (another fairy story); nowadays the distribution is free, and producing a new unit is cheap (in the case of digital distribution, it's totally free), so the ongoing costs of keeping the musicians alive and producing new music is the major cost for professionally produced music.

But I still think the big points made in the article is true: that the real cost of producing music - even music of reasonable quality - is coming down, that more music than ever is being produced and hence there's much more competition for listener's money, and that "hobby" artists who do it in their spare time and don't expect to make money out of their music (I'm one) drives the cost of actually getting music down too. So for professional musicians, who have sort of expected to make money out of music because their heroes of the previous generations did (due, as David points out, to a quirk in history that made the twentieth century great for this kind of oligopoly), it's a rude awakening to find out that people don't care about your twenty years in the industry or your great study of the art form, they care about listening to a catchy tune that's easy to get.

I also like the point that musicians are also inveterate software copiers. It's one reason I use LMMS and free plugins - because free, quality software does exist. I find it intensely hypocritical that professional musicians can criticise people for copying their music, when they may well have not paid a cent for all the proprietary software they use to produce it.

But to me this is really just about getting in touch with your audience. Companies like Magnatune exist to help quality artists find an audience by putting them in touch with an existing large subscriber base who wants new music. Deathmøle's insane success on Kickstarter shows that someone with an established audience can make it really big without having to sell their soul to big record labels. And Jeph himself is a great example of the way things work in the modern world, since Deathmøle is his side project - his main one is Questionable Content, which he also went into without having existing funding or requiring a big backer to grant him some money and take his rights in exchange. As Tim O'Reilly says, obscurity is a far greater threat to authors and creative artists than piracy; it doesn't matter if you're signed to the best record label there is, if they haven't actually publicised your work you might as well have not signed up at all. And, fortunately, these days we have this wonderful thing called the internet which allows artists to be directly in touch with their fans rather than having to hope that the record label will do the right thing by you and not, say, ignore you while promoting another band.

I wish David had made his point without the broad generalisations - I think it stands well without them.

Last updated: | path: society | permanent link to this entry


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