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Re: Going to use gpio for the first time

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The Natural Philosopher <tnp@invalid.invalid> wrote:
> On 22/04/2026 21:09, druck wrote:
> > On 22/04/2026 20:40, The Natural Philosopher wrote:
> >> On 22/04/2026 17:08, Michael Schwingen wrote:
> >>> On 2026-04-21, Daniel <me@sc1f1dan.com> wrote:
> >>>> Are there any newbie things I should look out for while I dive in?
> >>>> I'll be doing all the work on my trusty stock pi500.
> >>>
> >>> Be careful about different voltage levels. The atmega *can* run on 
> >>> 5V, while
> >>> the raspberry's GPIO pins only tolerate 3.3V.
> >>>
> >> In theory., In practice they can tolerate 5V if not from an uber low 
> >> impedance source
> > 
> > To avoid tears before bedtime, it is best to disregarded that.
> > 
> > ---druck
> 
> *shrug.* been running that way for some time

Be aware that different Pi SoCs are built on different process nodes, which
may have different high voltage tolerance.  A Pi 4 may be more sensitive
than a Pi 1, and on the Pi 5/500 the GPIO is on a separate I/O chip which
may be different again.

The Pi 500 is now $180 - I wouldn't risk it.

Theo

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Going to use gpio for the first time Daniel <me@sc1f1dan.com> - 2026-04-21 09:53 -0700
  Re: Going to use gpio for the first time rbowman <bowman@montana.com> - 2026-04-22 00:54 +0000
    Re: Going to use gpio for the first time Daniel <me@sc1f1dan.com> - 2026-04-22 07:09 -0700
  Re: Going to use gpio for the first time Michael Schwingen <news-1513678000@discworld.dascon.de> - 2026-04-22 16:08 +0000
    Re: Going to use gpio for the first time The Natural Philosopher <tnp@invalid.invalid> - 2026-04-22 20:40 +0100
      Re: Going to use gpio for the first time druck <news@druck.org.uk> - 2026-04-22 21:09 +0100
        Re: Going to use gpio for the first time The Natural Philosopher <tnp@invalid.invalid> - 2026-04-22 21:13 +0100
          Re: Going to use gpio for the first time Theo <theom+news@chiark.greenend.org.uk> - 2026-04-22 23:45 +0100
            Re: Going to use gpio for the first time The Natural Philosopher <tnp@invalid.invalid> - 2026-04-23 09:58 +0100
          Re: Going to use gpio for the first time not@telling.you.invalid (Computer Nerd Kev) - 2026-04-25 08:33 +1000
    Re: Going to use gpio for the first time Daniel <me@sc1f1dan.com> - 2026-04-22 23:55 -0700
      Re: Going to use gpio for the first time rbowman <bowman@montana.com> - 2026-04-23 18:35 +0000
  Re: Going to use gpio for the first time Gordon Henderson <gordon+usenet@drogon.net> - 2026-04-23 12:36 +0000

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