Organic Design (blog)
|Posted by Nad on 9 de setembro de 2015 at 11h02min|
This post has the following tags: Server
|Debian 8 has been the stable version since April, but I only just got round to upgrading the server today. Even then the main motivation was because of a sudden huge increase in spam which turned out to be due to two things. First we were being blocked from using the domain black-lists, and second because our version of Debian was using version 3.3.2 of [SpamAssassin], but it needs to use at least version 3.4 to make full use of the domain black-lists. Here's an example X-Spam email header showing that we're being blocked:
The first problem was happening because the black-list services run over DNS, but they will block requests from DNS servers that use their free services too much. We were using our server host's DNS servers which were being blocked because they relay requests to the black-lists from thousands of their clients, but they don't pay for the black-list services. This issue is easily fixed though, we simply needed to set up our own caching DNS server so that when SpamAssassin requests information form the black-lists they're going through our own server that makes only a minimal amount of requests. See Configure mail server for more details.
The best way to fix the second problem was to upgrade the OS because Debian 8 uses SpamAssassin version 3.4.0 which is modern enough to properly support the black lists. Here's an example of what the X-Spam headers are looking like now :-)
Another thing that's much more up to date in the new Debian version is our web-server, Nginx. This was only on version 1.2 before but now has gone all the way up to 1.6! This is good news because versions prior to 1.3 had no support for WebSockets, so now our page comments no longer need to use Ajax-polling which is very unresponsive and wasteful.
|Posted by Nad on 4 de setembro de 2015 at 12h05min|
|Wow it's been a long time with no blogging! We were mainly focussing on our meditation practice, but then did our three monthly trip to Caxias to do our shopping which always takes a lot of both mental and physical energy out of us, and takes a few weeks to recover from and get back into our meditative state again. But nothing much has really happened that's worth post a blog item about, except that the vege patch has recently start looking a lot better, here's some pictures of it as of September 2015 :-)|
|Posted by Nad on 28 de junho de 2015 at 07h41min|
|Corruíra (Troglodytes Musculus), this is a better picture copied from the Brazilian Wikipedia.|
|Posted by Nad on 10 de junho de 2015 at 05h12min|
|Well here it is, the long-awaited Antenna 2.0 blog post!
Our net's been getting worse and worse over the last year, not only slower, but also we have a long delay before connecting - sometimes more than an hour! And so I thought that a bigger antenna may help by enabling us to use 3G instead of 2G. Even though the problem is mainly with our provider, Vivo, because we often a perfect 5-bar 2G signal, but still have a very slow connection, we figure that a bad 3G connection will be a lot better than a bad 2G connection!
So the first step was to get the metal, thick copper tubing for the boom and thin copper for the wave-guides. Our friend Eduardo happened to have a load of six metre copper tubes - he builds apartments and has a huge "hardware store" below one of them where he keeps all the left overs and spare parts, there's rows of shelves full of pipes and cables and even areas with dozens of porcelain sinks and toilets! The new antenna is three meters, but unfortunately we needed to get it in two pieces to fit on the bus and in our little hire car. He didn't quite have thick enough single-core copper cable for the wave guides, so we went to a metal scrap yard for that and picked up ten metres of uninsulated 3mm diameter copper wire.
The first part of the construction job was to join the pipe back into a single three meter length. Unfortunately I still haven't bought an acetylene tank for my gas welding kit, so I had to make do with soldering instead of brazing. I cut the ends as shown below to increase the join length and filed the ends at an angle (not shown in the photo) so the solder would still be strong after filing the pipe smooth, and I also positioned the join exactly where a wave-guide would sit to further increase strength...
...but all to no avail, the solder was just too weak to support the weight of such a long length. So I figured that the best way would be to have a section of slightly smaller diameter pipe that fitted inside the main pipe that would support the join from the inside and stop it from bending. But there's no way we'd be making a dedicated trip to the city and searching round for days for a piece of tube just the right size in the near future, so I figured that the project would have to be put on the back burner for a while.
But then a stroke of luck hit, one morning I opened the door, and there was the umbrella which had fallen on the ground and broken into three parts somehow - and you'd never believe it, but the tube that had somehow broken was exactly the right size to use for the antenna join! I quickly fixed the umbrella with a piece of wood as I sensed some rolling pin activity on the brew :-/
So the next step was to drill the holes for all the wave guides. I needed to ensure that they were all on exactly the same plane without twisting so I clamped the pipe firmly onto a straight piece of wood and made a guide that would ensure that all the holes were in exactly the same position on the pipe.
Then next I filed and tinned the holes and soldered the wave guides in. I actually found that soldering them by holding the joins over the gas oven element was easier than the soldering iron because the pipe sucks all the heat away - again brazing them would be by far the easiest and strongest solution. I made sure the metal I soldered in for the wave guides was a few millimetres too long so that I could cut and file them perfectly to length afterwards.
The most difficult part to get exactly the right size and shape is the folded dipole, the bit that the cable joins to. But after a couple of attempts I made one that was accurate to about half a millimetre. I attached it to the boom in a piece of PVC pipe as shown below.
And then the final steps, painting it and putting it up on the hill! Beth's much better at painting than me so she took care of this part :-)
And so what was the final result?!
Well.... kind of mixed results really... it can only get a two bar 2G signal whereas the small one gets a full five bar signal. It picks up a zero or one bar 3G signal which is about the same as the small one, but the 3G connection seems to consistently work, whereas the small antenna's 3G connection is very intermittent. More testing is needed, and there's a few tweaks that can be made to improve performance, but overall the results are rather disappointing :-(
Update: Well I've spent a few days reading, talking to radio engineer friends and doing some adjustments and the result, while not awesome, looks like it has at least achieved the goal of getting us into consistent 3G. First I replaced the metal bolt that was used to mount the folded dipole with plastic, then I mounted the whole thing onto a large PVC pipe so that the antenna can be held very straight since it was bending under it's own weight when not supported.
We've had some very rainy days and misty mornings and our 3G connection has continued to function throughout it all which the small antenna could never have done, so although it's unable to get a decent 2G signal, it's definitely performing more consistently on 3G, and that's the most important thing. We seem to be getting between 500 kilobits and one megabit most of the time, which means we should be able to do voice and maybe even video now :-)
|Posted by Nad on 22 de maio de 2015 at 14h20min|
|On out last visit to Caxias and Canela, Beth decided it was finally time to bite the bullet and get a proper oven! our little blue camping over has been with us right from the start and done a really good job, but Beth felt it was time to move on. We arrived back at the land about a week ago, but just got round to installing the new oven today, and now our place looks like a real kitchen! This is our third kitchen renovation since we started living here on the land :-)|
|Posted by Nad on 20 de maio de 2015 at 08h57min|
|We thought the Kumara looked pretty big and healthy as you can see from the photos of the leaves a few posts back, but we couldn't see any actual kumaras. Our neighbour Ziza told us that after the leaves turn black when it starts getting cold that's the time to harvest the kumaras, and we should see their tops poking out of the ground. But when the leaves turned black we couldn't see any! We dug around a little, but to no avail.
Then later Beth was clearing up one of the garden beds ready to plant some more things, when she suddenly came across a giant kumara! We searched around for more but could only find a few tiny ones. It looks like all the healthy leaves and vines spread everywhere were all supporting this one giant vegetable! Even though there was only one, the fact that it's so big and healthy is another really good indication that the soil's getting much better.
Beth dug it up and I grated it and then we fried it with an onion and ate it. It was really nice and was more than enough for two - in fact we didn't need anything else for dinner that night :-)
|Posted by Nad on 10 de maio de 2015 at 14h44min|
Yep that's right, our nice looking loft ladder wasn't all it was cracked up to be, and a step broke on it almost leading to an accident :-(
Beth's been really scared going up and down it, especially when tired in the middle of the night and the mornings, and after a few weeks of procrastinating, the rolling pin finally came out! So I quickly got some aluminium tube (thanks Eduardo!), adjusted the size of the holes in the wood to fit it and replaced all the dowel.
Another problem that had begun and could have lead to trouble was that some of the screws holding the steps tight were getting loose and allowing them to spin when stepping on them. So I've accounted for that problem with the new aluminium steps as well:
To hold the hole thing together, there's a long threaded-rod through every third tube bolted on each side.
|Posted by Nad on 22 de abril de 2015 at 09h34min|
Wait! come back! I can explain... I'm not talking about that red light! I mean this one, the red light on our charge-controller of course! The photo is a messed up one that I took when the flash was really needed, but it suits the post quite well :-) The red light means that the battery is very low and that the power will be cut off soon.
In the last few months we've noticed that the performance of the battery has decreased a lot, and we're getting into red-light territory more and more often. Then a few days ago, we had a full charge at the end of the day (flashing green light), and then after only an hour or so on the net in the evening, we were right back in the red light zone!
So we thought we really needed to explore this red light territory thoroughly! And that's when we discovered what I was trying to say above - that all the potential is there! It took an hour to go from fully charged (about 13.9 volts) to the red light at 12.1 volts, but over an hour to go from there down to 11.95! And we still don't know how far the red-light zone goes - we went all the way to 11.75 volts today, but we still haven't been cut off!
So we're going to be spending a lot more time in red-light territory from now on, and I'll even be doing a lot of my work down there, because we really need to know once and for all how far down it goes :-)
|Posted by Nad on 13 de abril de 2015 at 17h01min|
|Living in a tiny house makes you think carefully about what things you really need, and helps you to lead a much more minimalist and organised lifestyle. In a tiny house it's much more apparent when things aren't organised well, and this gives you a strong incentive to fix problems and get things into an orderly state quickly. For example, a few days ago when Beth had just woken up and was coming down the loft ladder still half asleep, her foot accidentally violated procedure and moved from the lounge area into the bathroom area! The "bathroom" is a shower-shelf in the middle of the South wall and bowl of water on Beth's computer desk! Her foot knocked over the bowl and poured the water all over the desk and floor! Luckily none of it went onto her computer, but it was still a very clear wake-up call - literally!
So I did some thinking about how to optimise the space a little better, and came up with a long-term plan and an immediate plan. The long term idea is to extend the toilet room southward by about 30cm and then put another north wall in there 30cm more to the south - effectively moving the whole toilet room 30cm southward. Then within this extra 30cm of space between the house and the toilet I can put all the tool shelves - basically pushing them back 30cm into the wall. That can then become a closable cupboard which will save some space along that wall and also look a lot more open and tidy.
The immediate plan which has already been completed over the last couple of days, was to remove the "BB" (Beth-Box) containing the solar components and put the battery and inverter into a new outside box. The charge-controller is now on the wall so we can still see the battery and panel status easily.
This was also a good opportunity to tidy up some messy wire joins and put some of my new heat-shrink to good use :-) I also moved the network hum from its unsightly location on the bottom of the loft floor to a hidden location behind the wall panel, and I cut that panel and made it into a little door so it's easier to work on in future as that panel is the main location where all the power and network connections join up.
And so back to the original point: the space saved by moving these things outside has meant we now have a very spacious and organised bathroom!
|Posted by Nad on 5 de abril de 2015 at 06h22min|
|After we arrived at the land this time, we didn't bring much food, we planned to go shopping after a couple of weeks. But after two weeks we didn't want to interrupt our meditation practice by going for a complicated busy trip to Canela so we decided to put it off for another week even though it would mean we'd have to put up with a pretty bland diet.
But after another week we'd found that it wasn't so bad - there were always various little things available in the vege patch that made the food a little less boring. Now we've been here five weeks and we're still doing fine! We've found that the vege patch works both ways - not only does it have to slowly improve so that it can produce more, we have to learn more about what it has to offer! For example, Beth discovered that Kumara and pumpkin leaves are edible and high in vitamins and minerals. The pumpkin leaves are a bit too rough to eat raw, but are good when cooked and added to soup or stir fry. The Kumara leaves have a really nice flavour and can even be added raw to salads.
The vege patch is producing a lot of other things in very small quantities too such as courgettes, sweetcorn, capsicums, onions and garlic. Even though it's a very small amount, it goes a long way when you don't have a lot of variety, but you can add a small but of capsicum or a few cherry tomatoes to a meal - and although the quantity is small, there's always something there :-)
There are always many herbs in the garden for adding to meals or having in tea, and the lime tree leaves make a good tea even though it's not bearing any fruit yet. We even had watermelon last week and yesterday, and the forest has been providing some blackberries :-)
It looks like in a couple of years we'll have the opposite problem - we'll always have an overload of fresh fruit and vegetables, but will have to ration our rice and other dry goods since we'll probably only be going shopping two or three times per year!