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Thread: Is there a market for a Teensy 3.1 48 pin ARM stamp?

  1. #176
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    Quote Originally Posted by pictographer View Post
    What's the source for this? Were they all sold at the current price?
    Regarding quantify - from https://store.particle.io

    > First run sold out! 20382 photons sold, now taking orders for August shipment.

    Regarding pricing - they didn't do a Kickstarter etc. for the Photon like they did for the Core but as far as I can tell all the preorders (and current orders) are at $19 ea.

  2. #177
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    I had to wait 6 weeks to get mine. I also bought the baseboard with a JTAG connector for SWD.

  3. #178
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    We must be careful comparing apples and oranges, or Teensies and Photons.

    I havnt tried the Photons, BUT in a thread devoted to the question of accessing every single pin in a 48 pin formfactor and probaly use every ounce of cycles the core cand deliver, a CM3 that uses a fair amount of resources and pins for talking to a wifi chip, well ... to me that sounds like the answer to a different set of requirements.

    Reading a lot of the chat on formfactors, pinouts, and ++'s and devtools all I can say it depends, depends on your background, the size of your projects, if cmd line tools feels homely and right or scary and arcane. If you prefer the small size, fairly complete set of easily useable libraries in a basic GUI that gets .... annoying ... as the project gets large, or you want a platform with everything available, until you start ranting how obscure Eclipse is. Personally I do projects that benefits from processor speed, memory but not a huge amount of pins.

    Its all compromises, we live with them and no chise will ever be perfect.

  4. #179
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    I've taken the idea from iwanders
    Perhaps it would be nice to create a small PCB which extends the Teensy form factor and makes the bottom pads more easily available (the Teensy is placed on top of this PCB). With an internal cutout we can ensure that these bottom pads are easy to solder.
    and ordered it from oshpark ($8.30 for 3pcs)

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    So, yes, the internal cutouts are not a problem.

  5. #180
    Senior Member Constantin's Avatar
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    Pretty darn brilliant! Not only do you break out all pins, but you do so inexpensively. Congratulations!

  6. #181
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    Looks like a great way to get to everything including the crystal? Now we have to buy Teensys in 3 packs?

    @hwguy - Is there a way to search OSH to find the way to order - or can you drop a link?
    Last edited by defragster; 08-15-2015 at 10:59 PM.

  7. #182
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    oshpark link: https://www.oshpark.com/shared_projects/UI47TwNf

    It is not necessary to solder the pins GND, D0-D23, 3.3V, AGND, VIN to the adapter board. On the bottom side of the pcb are footprints for one resistor (0805) and one diode (SOD-123). It connects VUSB to VIN. IF you use this option, you have to solder the VIN pin to the Teensy 3.1 board and to the adapter board.

    schematic

    Now we have to buy Teensys in 3 packs?
    or 50... You can fit it 5-6x into a 10x10cm china pcb. Dirtypcbs.com for example, 10pcs 10x10cm for $25. (= $0.5 for each adapter pcb)

  8. #183
    Senior Member+ Frank B's Avatar
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    Smile

    Two weeks ago I did something similar :
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    The board is currently still at OSH Park .
    3 for $ 3.45 (It's smaller)

  9. #184
    I was just thinking about designing this PCB when I drove back home today. Looks like you beat me to it Looks great! I'm happy to hear the idea worked out well.

  10. #185
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    Quote Originally Posted by HWGuy View Post
    I've taken the idea from iwanders

    and ordered it from oshpark ($8.30 for 3pcs)

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    So, yes, the internal cutouts are not a problem.

    can I still solder the rtc crystal with this board?

  11. #186
    Physically you can just make it point upwards... I always solder them at the top side before I put female headers on my Teensies as placing the crystal is harder afterwards (didn't require an RTC yet, so I'm not sure it works). However, thinking about this makes me wonder if the crystal's resonating is affected by the traces at the top of the PCB, various custom board designs experienced problems when traces were close or below the 16MHz crystal. Anyone know if the 32 kHz RTC crystal is affected by this as well? or would the effect be minimal?

  12. #187
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    I've soldered the RTC crystal on this board from the top side. The Teensy keeps the time without the main supply and 3V @ Vbat.

    In the long term I plan to make (or someone else) a new revision of this board with a cutout for the rtc crystal and some other changes.

  13. #188
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    iwanders, good point. I forgot the crystal connection is through hole. I've always soldered it on the bottom. I should try it on top next time.

    Quote Originally Posted by HWGuy View Post
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    why is the pcb edge (near A14 and PGM and on opposite bottom edge) not straight? was this how it came from oshpark or was this panelized on a larger board and manually cut?

  14. #189
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    dremel action

    I've tried to remove the mousebite connectors from the panelizing with a dremel and slipped off a bit.

  15. #190
    Senior Member Constantin's Avatar
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    I recommend a flat file for the mouse bites. Makes quick work of the bites and abrasion of non mouse bite areas is minimal. Simply pull and push the PCB edge while holding the edge of interest parallel to the file surface. 2-3 wipes later and the edge of the PCB will be smooth.

  16. #191
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    hwguy, can you post a pic of side view profile? I want to see how the boards stack up and what the pin header looks like. Also, since the cutout cuts a pad in half, so only the through hole will have copper right?

  17. #192
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    Click image for larger version. 

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    Also, since the cutout cuts a pad in half, so only the through hole will have copper right?
    Yes

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  18. #193
    This is so slick it makes me want to come up with a project that uses all those pins just so I have an excuse to buy a handfull of these boards.

  19. #194
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    That's brilliant.

    Excellent solution.

  20. #195
    Quote Originally Posted by defragster View Post
    Now we have to buy Teensys in 3 packs?
    Yes, i did so...

  21. #196
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    Quote Originally Posted by defragster View Post
    Now we have to buy Teensys in 3 packs?
    It really is best to order in multiples. That way they don't get lonely and more importantly, you'll have at least 1 extra on hand when inspiration to make something strikes so you can get building right away.

  22. #197
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    @HWGuy

    Fully bread board compatible - no end pins.
    Inexpensive hardware solution.
    Easily accessible VIN with jumper.
    Great solution for all GPIO pins.

    A job well done!

    ---------------------------------------------------------------------------------------------------------------------------------------------------------------
    To those off topic trolls or hijackers who did their best and failed to divert this topic should learn how to focus like a laser for a solution that HWGuy easily provided.

    Again, a job well done - HWGuy



    A solution has been provided to this topic - This topic is closed until "topper" makes another off the wall comment !!!!!!!!!!!
    Last edited by t3andy; 08-20-2015 at 05:35 PM. Reason: addition

  23. #198
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    Quote Originally Posted by t3andy View Post
    A solution has been provided to this topic - This topic is closed until "topper" makes another off the wall comment !!!!!!!!!!!
    And so decrees HRH.

  24. #199
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    My version arrived:

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  25. #200
    Senior Member+ Frank B's Avatar
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    OSH-Park shared project:

    https://oshpark.com/shared_projects/cYQjHdCu

    3 for 3.45$ (USD) (incl. shipping!)

    I have 6 of them, but need only 2. PM me if you want one..
    (Makes sense for Europe only, because of shipping time)
    Last edited by Frank B; 08-22-2015 at 09:54 AM.

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