Re: Jumpers and zero-ohm resistors

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John, Robert,

Zero Ohms resistors have the drawback to create two nets.

I had similar issue some years ago with Kicad 5.20, it didn't have any practical solution for that. So, I cheated, creating symbol and models for keeping the same net name on both sides of the jumper. Mandatory for power lines. My computer being too old, I didn't migrate to newer kicad versions. Consequently, didn't test the trick on post 5.20. But since you're asking the jumper question I assume that this hasn't been solved.

Instead, I made a specific component using 3 pads with the same net name, whichever the pad number is. In the middle a square one (thin and long, this is the "jumper wire"), of course not drilled and two round ones at the ends. The 3 pads were? overlapping, establishing a connection in between the ends.

For the schematics,I created a dedicated symbol with one terminal, (I named it "lnk"), and filled the attribute table for the BOM. I placed it on a convenient place on the net the jumper is installed, I numbered it. That's all.

Refer to the annexed files. Remember it's ver 5.20. You may have to modify it regarding the new version rules.

My application was to route a number of different single side PCBs where power lines were routed on component side via jumper wires. Refer to: "Strap footprint.png" & "Strap footprints in use.png"
In schema, the symbol was: "Strap symbol for eeschema.png", represented by "Strap Symbols attached to the drawing.png" in the electrical drawing.
"My_Straps.pretty.rar" is the strap library model for 3.81 to 22.86 mm long jumpers. And for the PCB I also provide an example "strap_test.rar" (not functional, for decorating your bedroom only ! ).
Have fun

On 20.09.24 18:49, Tony Casey via groups.io wrote:

Show quoted text

If you want to use headers and links, I have schematic symbols for those. Perhaps KiCad even has them in one of its extensive library, I don't know.

Alternatively, use zero Ohm resistors, and add a text note to say what they are for. Do that, as well for links. If they are multiple position links, add a truth table.

I try to put everything on the schematic. That way, nothing gets missed.

--

Regards,

Tony?
On 20 Sep 2024 17:17, John Woodgate <jmw@...> wrote:
Thanks, Robert. I suppose they have to be placed in the schematic exactly where they are needed in the layout, which can make the schematic look very odd.

On 2024-09-20 16:35, Robert via groups.io wrote:

They are normally in the schematic as zero ohm resistors.?? In the
layout they can be whatever you like, eg pukkka zero ohm resistors
(wire-ended or surface mount), hand-cut wire links, blobs of solder, etc.

Regards,

Robert

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