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Placing 24 LEDs on a schematic [message #165554] Sat, 23 April 2016 16:26 Go to next message
David Schwab
Messages: 4
Registered: April 2016
Junior Member
I'm designing a schematic for a debug board for a Z80 computer that I'm
building from component parts. The board will let me single-step through
a Z80 instruction cycle, and display the contents of the address and
data busses via 24 LEDs. The LEDs are attached to a 24-pin header, which
I'll connect to the computer prototype with jumpers.

My issue is that each LED assembly has 2 resistors and a transistor
along with it. There are 24 of these assemblies, and I'm having trouble
fitting them all on my schematic: I'm using an 11" x 17" frame, but it's
still not big enough. In printed schematics that I've seen, they usually
just show one LED assembly connected to one pin header, then note that
this is duplicated 24 times. Is there any way to do this in Eagle? Or is
there another solution, other than just duplicating each LED assembly 24
times?

I tried to attach my schematic, but it said the content type wasn't
allowed.

Thanks,

David

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Re: Placing 24 LEDs on a schematic [message #165557 is a reply to message #165554] Sat, 23 April 2016 19:07 Go to previous messageGo to next message
Paul Romanyszyn
Messages: 856
Registered: December 2004
Senior Member
On 04/23/2016 12:26 PM, David Schwab wrote:
> I'm using an 11" x 17" frame, but it's
> still not big enough.
Don't use a frame. you can scale the size to fit you paper when you
print it.
Paul R
Re: Placing 24 LEDs on a schematic [message #165558 is a reply to message #165554] Sat, 23 April 2016 22:31 Go to previous messageGo to next message
warrenbrayshaw
Messages: 1742
Registered: January 2010
Location: New Zealand
Senior Member
On 24/04/2016 4:26 a.m., David Schwab wrote:
> I'm designing a schematic for a debug board for a Z80 computer that I'm
> building from component parts. The board will let me single-step through
> a Z80 instruction cycle, and display the contents of the address and
> data busses via 24 LEDs. The LEDs are attached to a 24-pin header, which
> I'll connect to the computer prototype with jumpers.
>
> My issue is that each LED assembly has 2 resistors and a transistor
> along with it. There are 24 of these assemblies, and I'm having trouble
> fitting them all on my schematic: I'm using an 11" x 17" frame, but it's
> still not big enough. In printed schematics that I've seen, they usually
> just show one LED assembly connected to one pin header, then note that
> this is duplicated 24 times. Is there any way to do this in Eagle? Or is
> there another solution, other than just duplicating each LED assembly 24
> times?
>
> I tried to attach my schematic, but it said the content type wasn't
> allowed.
>
> Thanks,
>
> David
>
> --
> To view any images and attachments in this post, visit:
> https://www.element14.com/community/message/195349
>

Hi David
The .sch file extension is considered risky so for small files simply
change the file extension to .txt and say you have done that.
Also your file will likely be be to large for the Cadsoft Forum. It
needs to be under 40-50kB to get in.

You should zip it up.

Attached is a zipped up sch showing that an option is to use modules, if
your verion of Eagle has it available and you can use at least 2 sheets.

Unfortunately for you the file will likely not reach Element14 If not
pick it up at http://www.eaglecentral.ca

HTH
Warren
Re: Placing 24 LEDs on a schematic [message #165571 is a reply to message #165558] Mon, 25 April 2016 01:02 Go to previous messageGo to next message
David Schwab
Messages: 4
Registered: April 2016
Junior Member
Warren,

Thanks for the schematic: that looks like exactly what I need. I've got
7.4 Lite, and it opened without issue.

Thanks again!

David

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Re: Placing 24 LEDs on a schematic [message #165609 is a reply to message #165554] Tue, 26 April 2016 04:04 Go to previous message
Douglas Wong
Messages: 57
Registered: October 2013
Member
Z80 - wow - post some pictures.

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