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:In theory., In practice they can tolerate 5V if not from an uber lowAre 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.
>
impedance source
To avoid tears before bedtime, it is best to disregarded that.
*shrug.* been running that way for some time
It'll have protection diodes that limit the voltage at the inputs
to less than the 3.3V supply. However they're not designed to be
used in normal operation so the extra current carried from them
on the power connections inside the chip might upset the voltage
to other parts and cause weird problems, eg. when lots of inputs
go to 5v. So it could be a source of very confusing behaviour and
possible damage, though it's probably a small risk if there are
just a few high-impedance 5V signals connected.
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#_ < |\| |< _#
| Date | Sujet | # | Auteur | |
| 22 Apr 26 |  Re: Going to use gpio for the first time | 8 | Michael Schwingen | |
| 22 Apr 26 |  Re: Going to use gpio for the first time | 6 | The Natural Philosopher | |
| 22 Apr 26 |   Re: Going to use gpio for the first time | 5 | druck | |
| 22 Apr 26 |  Re: Going to use gpio for the first time | 4 | The Natural Philosopher | |
| 22 Apr 26 | Re: Going to use gpio for the first time | 2 | Theo | |
| 23 Apr 26 |  Re: Going to use gpio for the first time | 1 | The Natural Philosopher | |
| 24 Apr 26 | Re: Going to use gpio for the first time | 1 | Computer Nerd Kev | |
| 23 Apr 26 | Re: Going to use gpio for the first time | 1 | rbowman |
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