BBS:      TELESC.NET.BR
Assunto:  Re: Going to use gpio for the first time
De:       Theo
Data:     Wed, 22 Apr 2026 23:45:15 +0100
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The Natural Philosopher  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  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

--- PyGate Linux v1.5.14
 * Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

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