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Subject:	Re: [geda-user] Power and IO symbols
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From:	"Nicklas SB Karlsson (nk AT nksb DOT online) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Date:	Fri, 5 Feb 2021 21:04:13 +0100
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Den 2020-12-09 kl. 00:18, skrev Roland Lutz:
> Hi,
>
> I thought it might be useful to have some new-style power and I/O 
> symbols in the standard library, so I tried to distil a "standard" 
> version of each of the styles currently in use:
Yes most probably.
>
>     https://bugs.hedmen.org/tmp/pwr-io-symbols.png
>
> The symbols are functionally equivalent (each symbol has a netname= 
> attribute which specifies the net to which it is connected, visible by 
> default for all but the ground symbols), they only differ in their 
> visual representation and can be used interchangably.

All voltages are the same. Think it make sense only these with the same 
symbol is connected to same net and there is a need for several 
voltages. In my schematic I have more or less globally 3.3V, analog 3.3V 
and 5V. But also have 24V which is very common for automation equipment. 
And also guess some use lower voltage for battery powered equipment as 
this might also lower current consumption which also reduce power then a 
switched power supply is used. I also have lower voltage in some circuit 
but these are less global, generated by same device using them.

Might also make sense only these ground with same symbol belong to same 
net. Logic ground and and protective earth ought to be rather common and 
maybe also analog ground. Sometimes circuits are isolated but these are 
local or less global.


>
> There is a second set of input/output symbols for subschematic ports 
> which have a portname= instead of a netname= attribute but are 
> otherwise identical.

Looking in my schematics I have refdes and it produced more or less 
useful circuit boards, or at least the sub schematic was connected. 
There are also other attributes inside symbols but they are not visible, 
think they are not promoted.


>
> Any thoughts or comments?

Yes above


Nicklas Karlsson

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