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Joined 2 years ago
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Cake day: June 9th, 2023

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  • Much depends on the house. Traditional UK family housing with 2 plus stories and fron and back windows are far easier then modern subdivided multi flat buildings.

    The older building allowed concentrating on air flow by opening highest widows and drawing curtains that face the mid day sun. While opening lower windows on the low sun side. During the night crated a natural flow of air.

    Modern housing means the internal divisions and often lack of non concreted areas. Often prevent cooler air being able to flow. Or existing if the concrete hass 0 shading from the days sun,

    Single level can still do it. But much less effective as the temp difference is less. But when the internal layout limits airflow from the high sun to low non sun side. Way harder.

    Downstairs fans running overnight while sleeping with upstairs top windows open. Can be a huge difference.

    Or just remembering the direction goal of fans. iE removing higher air while pulling in from lower.

    It’s common for folks to place the fan between them and the window blowing at the bed. This is the worst thing as you are preventing hot air from leaving. Assuming you are not on the lowest floor.







  • Yep that can work. But ignores all the well documented and supported development community comments I pointed to while also indicating other options exist.

    As for.

    Turning some switches on and off while monitoring input values doesn’t sound very computationally intensive.

    You realise IO wise that describes your keyboard and mouse interaction on the most powerful gaming PCs.

    It’s what you do with the results that matters.

    GPIO supports a fair bit more then the on and off input and output. It’s slow compared to other systems. But has multiple serial protocols of differing types. Simple GUI displays can also be run via gpio connections. Low Res Lidar devices are available connected via the spi connections with all the data processed on that host PC.

    So no gpio use can require all levels of processing power post connection. It is after all designed for experimentation and prototyping.

    For my project. You clost to correct. I just use a simple GUI displays with xorg. So a pie 0 is plenty. And way lower power then the other options. It links to a pwm controller to power 2 12v 200w water tank heaters a relay for a 750w AC heater. Bluetooth connection to a BMS and solar MPPT. While operating multiple temp sensors measuring at different levels. And warning of legionaries risk. If the tank has not been over 65c in 14 days (actually 10 days but I’m over careful given the health status of my brother and I).

    So much less then the tiny Pie 0 would not be able to cope but mainly due to the need for the vision impaired interface. Speaking functions dose not take much. But doing so without being unusably slow is about the limit of a pie 0.



  • Not simple to remove. They can all be taken out.

    But the fire risk is a very valid point. All laptops should indicate they should not be left alone when charging. While many do. Setting one up in a unobserved location to run permanently should be batteryless or Lifepo4 adapted. So laptops may not be best suited to this environment. A used thin client or other DC input option may be much easier. Or an old desktop if batts and not wanted.


  • Some fun facts.

    Much of the modern phone tech you use now. Is based on principals amature radio experimenters developed.

    The hobby has been an active part of electromagnetic research since the 1920s. And while all the protocols etc are upgraded to fit with commercial use. The basic theories were discovered by hobbyists.

    We have even funded a few Leo satellites over the years. Many were launched in the 90 to early 2000. As Russia was using disabled ICBMs to send them up while meeting disarmerment treaties. US spent a fortune Russia profited from Thier disarmament.

    Look up amsat AO 51. I watched that launch (via video link) in 2004 but that and a small donation to it is my only sat input. I tend to play with HF or Shortwave radio more. Getting signals to travel world wide with 0 inferstructure and often low power is more my interest.

    But amature radio covers such a wide field nowadays. Most with some technical interest can find something they like.

    If you look up M0IXP it was not valid in 2004. I had a US licence under KG4ZGG from the FCC then. And have had 2 other between. M0IXP is mine for life now. As it is a level where much of the world either let’s me use it(lookup CEPT and amature radio). Or will issue a new local call sign if I show them the UK one (reciprocal licence agreements with the UK in non CEPT member nations). The others were all at lower levels. This leads many full licence holders to use the hobby as an excuse to travel. Tend to call them DXpeditions when groups do it.

    Yes this is a vain attempt to sell my hobby. Ignore if not interested. But it’s good to find newbies if folks are. It can also be way cheaper now then it was when I started. Due to hams developing SDR and huge commercial use of that tech. But cheaper is not always cheap. Depending on what type of radio interests you.


  • 25ft narrowboat. If not in UK that is a 7ft wide boat/barge designed for our narrow canal system. My brother and I are both visually impaired so the longer ones are not really doable for us.

    We spend the summers travelling the 2000 miles of canal network swapping over ever few weeks. I purchased the panals last year thinking they were as cheap as they were gonna get. But we are leaving the boat home to redo the interia over this and next summer. So they are filling my brother living room ATM. 1.7x1.qm each. So will cover most of the free roof of our little boat.

    Honestly it’s a total guess. But the density of new panals is why I think the price has dropped. All the cheap panals are around 20% efficent but we know 25 of higher has been possible for a good while.

    My guess is the price of making those has dropped to the point many chinese etc factories are planning to reequip. And they are selling of the glass 20% stuff while folks are looking.

    Once 25% is the price these were 2 years ago. Commercial use will likely move over entirely. Can’t imagine the big factories wanting to be stuck on the larger panals then.

    But it’s just a guess.




  • Add use of gpio to reasons to use pie.

    While gpio adaptors are available for pc. The software architecture is not as well rounded and documented.

    So for any complex hardware project development. Gpio based SBCs are often essential.

    So space, low power and gpio development.

    Otherwise yep old laptop or even desktop can be cheaper and more able.

    But overall. The wide software support and documentation for hardware connectivity is a bloody good reason to keep pie supported.

    I’m setting 2 up to control the hot water and solar dump system on my shared little boat. As I want to link 12v Lifepo4 batt charging with the solar dump and visually impaired control for AC and diesel heating of the water.

    Pies really are the best option to play with. While low power and easy to design a unique low vision interface.

    Also UK boat safty. Is issuing warning about permanently connected li ion batts on boats. So it is likely setting up a laptop to manage this while not on the boat. Will be banned in the near future.

    Only an issue for UK boating but worth considering the risks of leaving laptops to run when not observed.



  • Ofcom is the UK gov department in charge of radiowave licencing. Equivalent of US FCC

    As a ham I have a licence with them. But so dose all your WiFi equipment and phones have to meet there rules. Licencing can apply to a person, org or a device design depending on the frequencies used.

    Every nation that is a member of the ITU. International telecommunications union.(Almost all nations) Has to have an agency enforcing agreed to rules.

    So credibility on that subject yes. Very much.

    But on mental effect on groups of people. They have 0 expertise. And given the numbers used (38men able to self exclude based on subject of study). None on statistical analysis.

    Id only trust them on radio wave propergation, electromagnetic effect and licencing laws.

    Here my own experience talking to folks working there. Get past the telephone handlers and they are real experts.


  • Exactly the same comments made in the 60s. To keep the abortion ban then.

    It’s utter rubbish. Because this is happening. All changing the law dose is mean those become less unsafe when people feel able to contact help.

    Arresting a woman who misdiagnosed her conception date. Means absolutely anyone having an abortion legal or not. Is now scared to seek help. Police being encouraged to investigate0 victims of miscarriage. Means any medical issues during pregnancy can now scare the shit out of vonerable women. Encouraging them to avoid help when at risk.

    This is just using safety as a code word to excuse saying no. They in no way care about the safety of the patients only there own beliefs.


  • I’d love to see more innovation in mechanical storage.

    Yep most of it is dams and moving water ATM. And while that is efficient. It takes way more space then the UK can spare.

    There has been a lot of work using heat storage of late. As we develop more materials etc. I can see this becoming more common. Will always have more loss then gravity. But is much more practice to multi use the land. And build on smaller scale. It is popular in factory situations where heat is often the energy needed. Generate during the day from solar or wind store in huge heat absorbing blocks and release on the night shift.

    But use of land is the main problem with all natural renewables. Except maybe tidal. But even that has negative effects on land use. Wind turbines need space beyond the structure. While much can still be farmed. Farming land is also where they are best situated. Due to lack of nearby structures. Solar is a huge land hog. And moving it into our cities. Should happen but to be effective takes a complete redesign,

    But the fact that a single car park structure exists that doesn’t have the roof covered. Show how little effort has been pushed. Open land car parks should do more. But effect on others light will be an issue. But if you own a building that just parks cars on the roof. It is insane that nothing has motivated you to build out solar over the last 40 years of climate change acceptance.