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Blog Using Buses in Circuits with KiCad 7
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  • Author Author: shabaz
  • Date Created: 29 Jul 2023 1:49 AM Date Created
  • Views 11740 views
  • Likes 10 likes
  • Comments 10 comments
  • kicad 7
  • kicad
  • schematic
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Using Buses in Circuits with KiCad 7

shabaz
shabaz
29 Jul 2023
Using Buses in Circuits with KiCad 7

This topic is a bit fiddly to describe in words, so I hope the video will suffice. This blog won't have much text : ( I feel like a Ronin when I'm not having to type though! : (

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Top Comments

  • shabaz
    shabaz over 2 years ago in reply to Andrew J +1
    Hi Andrew, The layout looks great, even without buses! Really nicely organized! It's possible to have the same bus name drawn as a separate segment, e.g. if you need to reuse the bus on different locations…
  • shabaz
    shabaz over 2 years ago in reply to baldengineer

    Hi James,

    I reckon if they wanted to improve it, this is a situation where EAGLE was quite nice, basically first selecting wire mode, and then any click on the bus will bring up the entire list, to allow selection, and then continue drawing the signal. 

    Example with EAGLE:

    image

    With KiCad, I reckon what would be good would be if they could design it such that if W (wire) was pressed when the cursor is on a bus, then instead of just drawing a wire (as it does today), then it should just instantly show all the list, just like EAGLE. In fact this would be nice; pressing W and then all the possible signals listed in columns, or one large matrix, to let the user quickly choose, rather than the multiple-mouse-clicks that need to be done today. KiCad mockup of that:

    image

    Also today there's no flexibility in the direction that the signal will be pulled out. Whereas with EAGLE, it will bend in any direction because it follows the cursor:

    image

    If the 'W' key did what has been suggested above for wires off buses, then that EAGLE-style bending in any direction would be got for free, since that's existing W functionality (just not for a bus today).

    Should we suggest this (or with further refinements if you can think of any) to the KiCad developers? Would that be via the KiCad.info site, or via a GitLab request of some sort?

    Also there are a couple of bugs; one bug is already known but quite old, and one bug I raised yesterday.

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  • baldengineer
    baldengineer over 2 years ago

    Good video. With version 7, busses became a little more usable, in my opinion.

    I had NO idea about "unfold bus." I wonder if there is a way to make it more usable though.

    FYI, when you need to "repeat last command" for signals going to the right or up, like in your demo, I do a few tricks.

    I use the "repeat last command" to generate all of the labels. Of course, this creates them in a vertical column from 1 to n+1. At this point, if you highlight them all, you can use R (rotate) to spin them 90 degrees for your left-to-right labels.

    And to reverse the direction from n+1 to 1 vertically, just press Y (flip Y axis) to reverse the selection group

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  • Andrew J
    Andrew J over 2 years ago in reply to shabaz

    That's handy to know.  There's been a few occasions where I think a bus would have worked well but I couldn't work out how I could do that with two distinct parts so assumed it had to be continuous and that really screwed up the schematic.

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  • shabaz
    shabaz over 2 years ago in reply to Andrew J

    Hi Andrew,

    The layout looks great, even without buses! Really nicely organized!

    It's possible to have the same bus name drawn as a separate segment, e.g. if you need to reuse the bus on different locations of the sheet, and it will still connect the signals.

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  • Andrew J
    Andrew J over 2 years ago

    Great video Shabaz, good tips.  I presume the bus has to be continuous, i.e. I couldn't draw a bus around my driver and then a bus elsewhere on the schematic by the LCD - the buses have to be joined?

    I'm sure a bus or two would help declutter this:

    image

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