Two 5v pins are powered directly from the Pi's power supply, and two 3.3v pins are regulated down to this common voltage, leaving you with 31 unique pins and 28 true GPIO pins. Eight ground pins are all tied together (making each Pi GPIO essentially a 33-pin interface, plus some convenience). There is a version of Windows for ARM-based systems, but in terms of performance and capability, it's not on par with the Linux distros.Īll Raspberry Pis since 2014's B+ sport 40 pins (or plated holes awaiting a soldered-on pin header, in the case of the Zero models). There are other lightweight distributions like DietPi that are perfect for Pis, to say nothing of the media center, A/V, retro gaming, home automation platforms like Home Assistant, and other specialized distributions. Raspbian, the official Linus distro for the Raspberry Pi, is the obvious choice for casual users who just want to browse the web and check email occasionally, though it's certainly capable of more. Since there is not central control, any impulse toward bloat and its corresponding high-spec hardware requirements is usually counteracted by a faction pushing for a distribution that's more lightweight, and soon enough both options will become available - as well as 60 or 80 more that fall somewhere in the middle. This is where open source works its magic. Linux is famous for keeping old hardware viable via its more lightweight distributions, and the same mechanisms make it perfect for the Raspberry Pi.
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