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Learning Kicad

Discussion in 'PCB Layout, Design and Manufacture' started by darren adcock, Feb 17, 2019.

  1. darren adcock

    darren adcock

    438
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    Sep 26, 2016
    This very quick video tutorial was useful and easy to follow,

    Exporting images as SVG files to then convert to JPG or PNG to be able to share here via Imgur was a little tricky, . This quick video tutorial was helpful for this,
     
  2. Minder

    Minder

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    Apr 24, 2015
    I usually place mounting holes in the corners.
    Also no ground plane?
    I use Greenshot for capturing JPG's.
    M.
     
  3. darren adcock

    darren adcock

    438
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    Sep 26, 2016
    Ahh ok, I didn't realise I'd need to have a ground plane as all the ground connections are connected?

    Yes, mounting holes! I'll add them, thanks, that would have been a really annoying thing to forget!

    I'll look into Greenshot, thanks, "edit" I downloaded greenshot and it's perfect, thanks!

    Darren
     
  4. Minder

    Minder

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    Apr 24, 2015
    It is not compulsory ;)
    But most cases advisable for most circuits..
    Fortunately the one I forgot it on, was very low freq signals and minor circuitry.
    M.
     
  5. darren adcock

    darren adcock

    438
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    Sep 26, 2016
    Ok thanks.

    I'll try to add a ground plane as that is something else to learn, might as well fit as much learning in as possible o_O Also I'll do some reading about ground planes also

    Darren
     
  6. darren adcock

    darren adcock

    438
    29
    Sep 26, 2016
    Hi, got back to kicad today.

    Here is how the ground planes and mounting holes are looking. I wasn't sure which image was needed, so posted three

    This one is " Show outlines of filled areas only in zones"
    [​IMG]

    This one is the 'back layer' filled zone before i added the front layer

    [​IMG]

    And here is the front layer's filled ground zone

    [​IMG]
     
  7. Minder

    Minder

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    Apr 24, 2015
    One other thing I do when starting the PCB is to set the various trace widths up that I think I may need and then it is very easy to select them when running traces.
    Larger for power etc.
    M.
     
  8. darren adcock

    darren adcock

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    Sep 26, 2016
    Hey M
    Feel like i'm missing a hint here? Maybe the trace drawing current to the mosfet?

    edit#

    do the power traces need a larger width?
     
    Last edited: Mar 6, 2019
  9. Minder

    Minder

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    Apr 24, 2015
    With the amount of real estate you have there, there is no reason to skimp, especially on the significant traces.!;)
    M.
     
  10. darren adcock

    darren adcock

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    Sep 26, 2016
    Ok thanks. I'll work on this later today
     
  11. darren adcock

    darren adcock

    438
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    Sep 26, 2016
    Here's the updated pcb new file without ground plane and new trace widths, I used an online calculator, https://www.7pcb.com/trace-width-calculator.php. The motors I am using have a stall current of 1.5a and the online calculator suggests a trace width of 0.942mm. I made the traces relating to TIP120/motor out all 1mm wide, and both the +12v and -12v supply lines.

    I changed all other traces to 0.5mm, no other reason than 'not to skimp'. I couldn't find any online material that suggested the 3khz trace output of 555 needed a specific width, but then i'm certainly not fully understanding what I am reading, lot's of new terminology.

    I also got rid of two of the mounting holes as I prefer to mount pcb's vertically

    [​IMG]
     
  12. darren adcock

    darren adcock

    438
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    Sep 26, 2016
    and here is the ground planes added.

    Rear layer

    [​IMG]

    front layer

    [​IMG]
     
  13. Minder

    Minder

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    Apr 24, 2015
    Looks better!
    M.
     
  14. darren adcock

    darren adcock

    438
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    Sep 26, 2016
    Thanks

    Then I clicked the design rules checks and got a whole bunch of errors, so will work through them now
     
  15. darren adcock

    darren adcock

    438
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    Sep 26, 2016
    Ok that was a little easier than i thought it was going to be, just hadn't paid attention to traces being too close to pads as I'd relied too much on kicad deciding where the traces should go.

    This passes the design rules check.

    [​IMG]

    [​IMG]
     
  16. darren adcock

    darren adcock

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    Sep 26, 2016
    Am a little confused. How come in pcb view, when i select front view and front silkscreen layer i see all the text I'd like on the final pcb, but when i view in Gerber view I don't see all the texts, just the reference for each component?

    pcb view

    [​IMG]

    Gerber view

    [​IMG]
     
  17. darren adcock

    darren adcock

    438
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    Sep 26, 2016
  18. Minder

    Minder

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    Apr 24, 2015
    The next step is to ZIP or RAR it and send to the board manuf, PCBway etc for their approval.
    They will tell you if it comes up to scratch.
    M.
     
  19. darren adcock

    darren adcock

    438
    29
    Sep 26, 2016
    Excellent, fingers crossed. Thanks so much for your help

    Darren
     
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