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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
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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
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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.

  14. #114
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    I've put together a design for a combination USB Host and SD breakout board. The idea is that it straddles atop the teensy and connects via a tall-ish header to the original Teensy 4 breakout board below. It has the SD slot on one side and the USB A connector on the top side. This way you can use the Teensy 4 on a traditional perfboard and still have the SD and USB connectors, which are all at one end.

    Details here: https://github.com/blackketter/teensy4_combo_breakout

    Would love feedback on this approach from anybody who can take a look. Thanks!

  15. #115
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    Digi-Key HR1941CT-ND (DM3D-SF) SD Card socket is out of stock.
    But they do have H126097CT-ND (DM3D-SF(41), which appears to be identical.

    Will that one work on the blackketter/teensy4_sd_breakout ?

    Thanks,
    Bill

  16. #116
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    Quote Originally Posted by wrljet View Post
    Digi-Key HR1941CT-ND (DM3D-SF) SD Card socket is out of stock.
    But they do have H126097CT-ND (DM3D-SF(41), which appears to be identical.

    Will that one work on the blackketter/teensy4_sd_breakout ?

    Thanks,
    Bill
    They do appear to be identical, same datasheet, etc. I can't think of a reason why the new part number wouldn't work exactly the same.

  17. #117
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    Quote Originally Posted by blackketter View Post
    They do appear to be identical, same datasheet, etc. I can't think of a reason why the new part number wouldn't work exactly the same.
    Thanks,
    Bill

  18. #118
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    My (1.6mm) boards arrived earlier this week. I live in Europe, and I had my order in hand a scant 6 calendar days after placement! In my experience, OSH Park has always under-promised and over-delivered.

    I ordered every board in the suite. I doubt I'll ever use a couple of them, but since fast international shipping was already half the total cost, an extra few $$ made sense just in case. My only thoughts are:
    a-1) I doubt I'll ever use the SMD Breakout Boards. Don't want to create the required additional PCB, but also nearly every one of the small castellations require de-burring - a ton of work under a magnifier with all those very small holes.
    a-2) The board router (not trace router) had to leave the mouse-bites intact to keep the boards attached to the large panel, so those holes will require manual-castellation (OUCH! Who knew castellation was even a verb?).
    b) The BOMs with Digikey part numbers... Are they on GitHub somewhere that I just didn't see? I believe I found all the correct parts for my Digikey order. But the inductor and SD connector were a bit confusing, and just finding everything took quite a bit of searching.

    Regarding the thru-hole Breakout Board: Other than the burrs that needed to be cleared in a few of the castellations, it looks perfect! The plating of every castellation is complete top-to-bottom (that is also true for the SMD Breakout). The silkscreen additions are helpful, and I like that there's a date on the board since there've been a few revs so far. I'm looking forward to soldering one up later today after my solder paste arrives.

    Finally, most of my Teensy 4.0 applications won't actually need a Breakout Board. While I can't use every available I/O pin without one, I rarely require more than the stock board provides. I didn't choose the Teensy 4.0 because of all the I/O, but instead because:
    a) It works virtually seamlessly with the Arduino IDE
    b) Its form-factor/small size
    c) Its speed/power
    d) Its cost/value
    It's becoming my go-to embed for those reasons. And now, if I need to access the SD pins or more I/O, no problem.

    Thanks for all your work creating these boards, and then making them available to the community!

  19. #119
    Hi,
    does a breakout board already assembled exist ? where can i puchase one ?
    thanks in advance.

  20. #120
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    Quote Originally Posted by andromeda View Post
    Hi,
    does a breakout board already assembled exist ? where can i puchase one ?
    thanks in advance.
    I'm not planning on offering these as a product, but I'd be happy to help out anybody interested in making one.

  21. #121
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    Quote Originally Posted by RDDyer View Post
    My (1.6mm) boards arrived earlier this week. I live in Europe, and I had my order in hand a scant 6 calendar days after placement! In my experience, OSH Park has always under-promised and over-delivered.

    I ordered every board in the suite. I doubt I'll ever use a couple of them, but since fast international shipping was already half the total cost, an extra few $$ made sense just in case. My only thoughts are:
    a-1) I doubt I'll ever use the SMD Breakout Boards. Don't want to create the required additional PCB, but also nearly every one of the small castellations require de-burring - a ton of work under a magnifier with all those very small holes.
    a-2) The board router (not trace router) had to leave the mouse-bites intact to keep the boards attached to the large panel, so those holes will require manual-castellation (OUCH! Who knew castellation was even a verb?).
    b) The BOMs with Digikey part numbers... Are they on GitHub somewhere that I just didn't see? I believe I found all the correct parts for my Digikey order. But the inductor and SD connector were a bit confusing, and just finding everything took quite a bit of searching.

    Regarding the thru-hole Breakout Board: Other than the burrs that needed to be cleared in a few of the castellations, it looks perfect! The plating of every castellation is complete top-to-bottom (that is also true for the SMD Breakout). The silkscreen additions are helpful, and I like that there's a date on the board since there've been a few revs so far. I'm looking forward to soldering one up later today after my solder paste arrives.

    Finally, most of my Teensy 4.0 applications won't actually need a Breakout Board. While I can't use every available I/O pin without one, I rarely require more than the stock board provides. I didn't choose the Teensy 4.0 because of all the I/O, but instead because:
    a) It works virtually seamlessly with the Arduino IDE
    b) Its form-factor/small size
    c) Its speed/power
    d) Its cost/value
    It's becoming my go-to embed for those reasons. And now, if I need to access the SD pins or more I/O, no problem.

    Thanks for all your work creating these boards, and then making them available to the community!
    Glad you like them! The BOMs are available as web pages called "ibom.html" in the "bom" directories in GitHub. You'll need to download the HTML file and open it with a browser.

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