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Thread: Another Teensy 4.0 Breakout Board

  1. #101
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    I received my boards yesterday, in 1.6mm. No apparent issue.

    I began soldering one today. I had to clean some copper burr, but it went smoothly after that. No trouble with the smallest castellations, a bit of flux paste made quick & easy work of them.


    I'm now stuck for the day as I can't build the USB Host board ; Farnell split my components order in two without me noticing, one of the package is still at the post office...

  2. #102
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    I've updated the design a bit to improve the silkscreen and tweaked the edge cuts to not cut through two pins that didn't need cutting (teensy pins 12 & 13). Updated here:

    https://github.com/blackketter/teensy4_header_breakout

    and here:

    https://oshpark.com/shared_projects/9TplvPXu

  3. #103
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    And some more updates this morning to add additional ground connections and a ground plane, as well as some more silkscreen improvements:

    https://github.com/blackketter/teensy4_header_breakout

    and here:

    https://oshpark.com/shared_projects/JoIFFIWW

  4. #104
    Senior Member+ MichaelMeissner's Avatar
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    Quote Originally Posted by blackketter View Post
    And some more updates this morning to add additional ground connections and a ground plane, as well as some more silkscreen improvements:

    https://github.com/blackketter/teensy4_header_breakout

    and here:

    https://oshpark.com/shared_projects/JoIFFIWW
    Would it be possible to have pin #'s on the bottom silk screen? At least for the pins > 23? I really don't want to have to refer to an online site when I'm bringing out pins.

  5. #105
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    Quote Originally Posted by MichaelMeissner View Post
    Would it be possible to have pin #'s on the bottom silk screen? At least for the pins > 23? I really don't want to have to refer to an online site when I'm bringing out pins.
    Good suggestion. I'll see what I can fit in there! How's this?

    Click image for larger version. 

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    Last edited by blackketter; 10-21-2019 at 07:42 PM. Reason: Added pic

  6. #106
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    Quote Originally Posted by blackketter View Post
    Good suggestion. I'll see what I can fit in there! How's this?

    ...
    That looks very good! So much better to see silk screen refs to prevent confusion in flipping the board.

    Question why are pin #34 and On/Off a square pad?

  7. #107
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    Quote Originally Posted by defragster View Post
    That looks very good! So much better to see silk screen refs to prevent confusion in flipping the board.

    Question why are pin #34 and On/Off a square pad?
    No good reason, they were like that in the original default footprint for the header that I used. Rounded them out:

    Click image for larger version. 

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  8. #108
    Senior Member+ defragster's Avatar
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    Quote Originally Posted by blackketter View Post
    No good reason, they were like that in the original default footprint for the header that I used. Rounded them out:
    Okay - Wasn't sure if GND was normally square so it caught my eye.

  9. #109
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    Quote Originally Posted by blackketter View Post
    Good suggestion. I'll see what I can fit in there! How's this?
    I would suggest to also put the pin numbers on the top silk layer for those who want to use a double row header as seen on the first picture you posted.

    Attachment 17638

  10. #110
    Quote Originally Posted by blackketter View Post
    They were pretty clear with me that the castellated designs were not guaranteed. Their tips are here: https://docs.oshpark.com/tips+tricks/castellation/

    My guess is that the thinness of the board and the thickness of the traces (2oz vs 1oz) conspire together to make this a little tricky to get right reliably.

    While I'm disappointed that the 0.8mm design didn't work first time, I suspect that it could work reliably with a few iterations.

    For production volumes it would make more sense to work with a board house to dial in the design, production and inspection process to get it right reliably.
    i'm not sure how much control over the content of the shared board page on OSH you have but i noticed you have a note about the .8mm on your github and something similar on the OSH board page would be a plus.

  11. #111
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    Quote Originally Posted by dkryder View Post
    i'm not sure how much control over the content of the shared board page on OSH you have but i noticed you have a note about the .8mm on your github and something similar on the OSH board page would be a plus.
    Good point, I've added it to the OSHPark project page for the latest design.

  12. #112
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    Quote Originally Posted by neurofun View Post
    I would suggest to also put the pin numbers on the top silk layer for those who want to use a double row header as seen on the first picture you posted.

    Attachment 17638
    Another good suggestion. I'll add that to my next version!

  13. #113
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    Sounds great - for only $6.30 (shipped in US).

    https://oshpark.com/shared_projects/tZbsjC0v

    Thanks blackketter, for this and the ESP32 and SD cards you made available on oshpark.

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