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Joined 3 年前
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Cake day: 2023年6月9日

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  • Unfortunately you fail to understand the history. Stall man FSF etc is a relatively new organisation started in the 80s.

    Open source was a term long before that. And it was created by early Unix commercial dostros in the 60s. There were magazines etc dedicated to it as a mess with to allow commercial software to spread to multiple platforms. Long before stallmans free as in beer attitude.

    So no the other licences have a place in history and are open source even if you and I may not support their ideals.

    This is why words like libre and free software were formed to include our expanded ideals.



  • Exactly. No matter the y dimension. Barcode data is only stored in x. Whereas QR uses x and y for data.

    They also use the corner squares and a few specific dots to allow scanning from greater angles. Basically allowing the data to be read in 3d space. Even though only 2d is used to store that data.

    This is why QR can work well with cameras. Whereas bar codes are designed for very short range laser reflection.

    PS lots of info on QR online including open source programs to make your own.

    The same goes for bar codes. But readers involve some very simple maker skills. Making simple barcode readers was a common school science project in the early 90s.








  • 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.


  • 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.