kicad-developers team mailing list archive

[Jeff Young <jeff@xxxxxxxxx>]

And just to add one more (which was the instance that prompted my question):

Logos, certifications, etc.: symbol: no, footprint: yes, virtual: yes.

But I see now that we can’t use virtual as a proxy for “don’t treat as ‘extra’ when deleting extra footprints” because if you delete a symbol in one of the symbol:yes cases, then you do want the footprint deleted.

Cheers,
Jeff.


> On 22 Jul 2019, at 01:53, Dino Ghilardi <dino.ghilardi@xxxxxxxx> wrote:
> 
> Just few examples (expanding jp's answer):
> 
> having a schematic symbol, being virtual, having 3d model are not related (you can have any combination of them). As examples:
> 
> First: a virtual footprint that has a schematic symbol (the answer to your main question).
> Edge connector: schematic symbol: yes, footprint: yes, virtual: yes (the connector is implemented only with tracks on  pcb, without the need of additional components so no need to have it in the BOM).
> 
> "regular" component, as a Resistor 0805: has schematic symbol, Has a footprint and we want it in BOM. (virtual: no.)
> 
> Hole without screw (yes, I'm copying jp's example): No schemaitc symbol (or sometimes yes, depending on user's habits: someone likes to have on schematics anything that will be on PCB, including holes): Has a footprint but no items in BOM: (virtual: yes)
> 
> Hole with screw: Has a footprint but you want a corresponging item in BOM to have the list of screws you need to buy (virtual: no).
> 
> P.S. (little bit off-topic):
> Sometimes also virtual components can have 3d shapes (it is not common but it is a way to quick-workaround a 3d view of a more-than-one board assembly: export a step file of the board 1 and assign that as a 3D shape to a connector or a mounting hole of board 2. -very useful to check for mechanical collisions-).
> 
> Cheers,
> Dino.
> 
> 
> 
> ---------------------------------------------------------------------
> On 22/07/19 09:02, jp charras wrote:
>> Le 22/07/2019 à 06:03, Jeff Young a écrit :
>>> This flag tells us that there’s no physical object for a pick-n-place machine.  But is it also true that there’s no corresponding symbol in the schematic, or are there some virtual footprints that would have a symbol?
>>> 
>>> What about some microwave elements, for instance?  Do they have symbols?
>> "Virtual" footprint means the physical "component" is made only by the
>> drawings on the board.
>> Therefore:
>> - These fp have (usually) no 3D shapes, and the component should be not
>> in BOM.
>> - They of course have a symbol in schematic.
>> In fact any footprint connected to a at least one net *should* have its
>> corresponding symbol in schematic.
>> (I am thinking all footprints should have a corresponding symbol because
>> in many cases these fp need a unique refdes: for instance to import them
>> to a .dsn file)
>> Microwave elements, and edge connector cards are often virtual, if only
>> a drawing is enough to create them.
>> Net ties are virtual and *need* a symbol.
>> However, Microwave elements and Net ties connecting 2 or more different
>> nets are not easy to use in Pcbnew:
>> See this thread
>> https://lists.launchpad.net/kicad-developers/msg24455.html
>> to know what is missing in Pcbnew (the Tomasz's proposal is exactly what
>> is needed in Eeschema/Pcbnew).
>> Mechanical holes can be virtual or not:
>> A mechanical hole with a screw inserted inside it should be not virtual.
> 
> 
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