Component Values on Schematic

Michael Sansom wrote on Fri, 09 April 2010 16:05

I know that Eagle's philosophy is to have generic valueless components

 

(for instance, a generic resistor) which the user then assigns a value

 

to (for instance "10k") when the component is placed on the schematic.

Not exactly.  You can set up devices to be valueless, but also to have

predefined values.  This is what value on/off in the device means, although

I can never remember which way on or off is (what a stupid choice of names,

like CUT really does COPY).

Quote:

Is there a way to "hardcode" the values on each part so that

I don't have to manually go and edit it after I drop the part?

Yes.

Quote:

Also, in

some cases, it would be advantageous for the part to have this

pre-assigned value, but not have that value displayed on the

schematic.

So don't put >VALUE in the symbol definition anywhere.

Quote:

For example, on a connector I might not want the part number

displayed on the schematic, but I do want it to show up in the BOM when

 

I run bom.ulp.  So, is there a way to have an invisible value on a

part?

I think you should leave the value attribute for just that and use your own

private attribute for your internal part number.  A connector is a good

example where you want the value to show something else.  You might want to

the value displayed on the silkscreen so the connector can be labeled IN,

OUT, Power, or whatever.

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

Olin Lathrop wrote:

I think you should leave the value attribute for just that and use your own

private attribute for your internal part number.  A connector is a good

example where you want the value to show something else.  You might want to

the value displayed on the silkscreen so the connector can be labeled IN,

OUT, Power, or whatever.

Thanks Olin, that was most helpful.  I agree with you on the value

on/off being counterintuitive and difficult to remember (funny how those

things seem to go together).  The use of the value on/off has been

difficult to grasp and I'm still not sure exactly how and when to use

it.  I suppose I'll have to resort to the manual.  Great tip about not

putting ">VALUE" in the symbol keeping the value invisible on the schematic.

Thanks again,

-Michael

On 4/9/2010 2:20 PM, Michael Sansom wrote:

Olin Lathrop wrote:

 

I think you should leave the value attribute for just that and use

your own

private attribute for your internal part number. A connector is a good

example where you want the value to show something else. You might

want to

the value displayed on the silkscreen so the connector can be labeled IN,

OUT, Power, or whatever.

 

Thanks Olin, that was most helpful. I agree with you on the value on/off

being counterintuitive and difficult to remember (funny how those things

seem to go together). The use of the value on/off has been difficult to

grasp and I'm still not sure exactly how and when to use it. I suppose

I'll have to resort to the manual. Great tip about not putting ">VALUE"

in the symbol keeping the value invisible on the schematic.

 

Thanks again,

 

-Michael

 

 

another quickie way to get a value off the schematic is to SMASH the

part and then DELETE the value text. sometimes it comes back though...

Gary Gofstein wrote on Fri, 09 April 2010 18:26

another quickie way to get a value off the schematic is to SMASH the

part and then DELETE the value text. sometimes it comes back though...

I thought deleting a individual text string of a smashed part unsmashed

that string.  Maybe that changed somewhere in some rev, but I'm pretty sure

that's how it used to work.  That's why I create a layer called "trash" in

the board, and move smashed text I don't want to that layer.

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On 4/10/2010 5:57 AM, Olin Lathrop wrote:

Gary Gofstein wrote on Fri, 09 April 2010 18:26

another quickie way to get a value off the schematic is to SMASH the

part and then DELETE the value text. sometimes it comes back though...

 

I thought deleting a individual text string of a smashed part unsmashed

that string. Maybe that changed somewhere in some rev, but I'm pretty sure

that's how it used to work. That's why I create a layer called "trash" in

the board, and move smashed text I don't want to that layer.

 

don't know - works in v4.16. if you delete both smashed texts, they will

come back however. but I like the idea of just moving it to an invisible

layer, thanks.