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  1. Hardware design is up here: ...

    Hardware design is up here: https://github.com/blackketter/briteboard
  2. Totally feasible. I've built a Teensy 3.6...

    Totally feasible.

    I've built a Teensy 3.6 based keyboard similar to what you describe. While it has a 5x14 mechanical keyboard matrix, it also has a USB host port that can support an external...
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    I use KiCad, it's open source and free and has a...

    I use KiCad, it's open source and free and has a really solid development team and community. I was frustrated by the limitations of the free versions of Eagle (2 layers, 10cm x 10cm, owned by...
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    Can you elaborate? What languages do you mean?

    Can you elaborate? What languages do you mean?
  5. If you have a spare GPIO, couldn't you tie that...

    If you have a spare GPIO, couldn't you tie that to the ON/OFF pin and set it to input?
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    Glad you like them! The BOMs are available as...

    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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    I'm not planning on offering these as a product,...

    I'm not planning on offering these as a product, but I'd be happy to help out anybody interested in making one.
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    Looking good! Do you have a mechanical drawing...

    Looking good! Do you have a mechanical drawing or some dimensions for a footprint?

    Also, what's the timeframe for a beta?
  9. USB-C is the defacto standard for all Android...

    USB-C is the defacto standard for all Android phones, Macs and some iPads. I got my first USB-C device late last year (updating my 7 year old MacBook Pro) and when I discovered that my iPhone can...
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    @loglow, dunno if you saw this thread:...

    @loglow, dunno if you saw this thread: https://forum.pjrc.com/threads/58943-CircuitPython-port-to-RT1062 but it may be useful for your bringup. Also might increase the addressable market for your...
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    CircuitPython port to RT1062

    I just saw a pull request for a port of CircuitPython to the i.MX RT1062 which powers the Teensy 4:

    https://github.com/adafruit/circuitpython/pull/2456

    The author mentions that he's working on...
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    +1 on being able to reset via the program button....

    +1 on being able to reset via the program button. This is particularly problematic with teensy 4.0 as there's no external reset pin. AFAICT, if you accidentally hit the program button when no...
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    Platformio provides a terrific command line build...

    Platformio provides a terrific command line build environment for all the Teensies and hundreds of other boards. It also works with VisualStudio, if that's your preference.

    Highly recommended.
    ...
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    Looking good! Two new thoughts: 1. I...

    Looking good!
    Two new thoughts:

    1. I don't know if it will help save any space but I'm great with leaving the programming tact switch off the board. If somebody is using the bootloader to...
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    This looks fantastic! I have a couple of initial...

    This looks fantastic! I have a couple of initial reactions:

    1. I'm not sure I understand why so much board space has been dedicated to the programming pads (holes?).
    If they are there for...
  16. What I did on my Mac (probably the same for...

    What I did on my Mac (probably the same for Linux, not sure about Windows) was to move aside the installed cores directory:


    mv ~/.platformio/packages/framework-arduinoteensy/cores...
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    Your assumptions sound correct. The program...

    Your assumptions sound correct. The program button on T4 just shorts the program pin to ground. Assuming you have a solid shared ground and a high impedance GPIO on the Pi, pulling that pin low...
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    I'd love to see your design and improvements...

    I'd love to see your design and improvements whenever you can share them!
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    You can see the design here: ...

    You can see the design here:

    https://github.com/blackketter/teensy4_esp32_breakout

    It uses teensy digital pins 24, 25, 26, & 28 for a serial connection and reset for serial programming.
  20. If you haven't seen it yet, check out the Teensy...

    If you haven't seen it yet, check out the Teensy 4.0 breakout board and USB host board I made in this thread:

    https://forum.pjrc.com/threads/57672-Another-Teensy-4-0-Breakout-Board

    It copies...
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    What are looking to do with the combination? ...

    What are looking to do with the combination?

    I've built an ESP32 add-on to my Teensy 4 breakout board and have successfully gotten firmware updates to the ESP32 to work passing through the...
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    I totally understand, those pins are tricky to...

    I totally understand, those pins are tricky to access! And your board looks excellent.
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    Sorry, but the USB pads on the bottom of Teensy...

    Sorry, but the USB pads on the bottom of Teensy 4.0 are for an additional USB host port, they aren't connected to the existing USB device port on the board used for connecting to the host computer. ...
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    Any reason to not use the SD pins available on...

    Any reason to not use the SD pins available on the bottom of the T4? There are a few breakout board designs that ease connection to those pads:
    ...
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    They do appear to be identical, same datasheet,...

    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.
  26. Yes, by cycling the power or having the teensy...

    Yes, by cycling the power or having the teensy reboot itself.
  27. Another data point: I use platformio on macOS...

    Another data point: I use platformio on macOS with T4 and have never had a system crash.

    Also, can you reproduce the problem _without_ reprogramming the teensy?
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    For the software, check out KiCad...

    For the software, check out KiCad (https://kicad-pcb.org). It's free and open source and can handle some very complex designs. While it's not trivial to get started, it's gotten a lot easier to use...
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    I've put together a design for a combination USB...

    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...
  30. The extra circuitry in the Teensy 3.6 (copied...

    The extra circuitry in the Teensy 3.6 (copied into the Teensy 4 USB Host Breakout) provides power overload protection, power control, and USB ESD protection.

    If you are willing to bet that you...
  31. I'm not on that specific hardware, but I've been...

    I'm not on that specific hardware, but I've been on a MacBook Pro on that version of the OS and have not seen any system crashes.

    I'll throw out a few things to try toward narrowing it down:

    1....
  32. The ESP32-S2 looks really interesting and could...

    The ESP32-S2 looks really interesting and could be used as you described.

    Indeed, if the ESP32-S2 has a robust USB host implementation, it could give the Teensy 3.6 and 4.0 a good bit of...
  33. Thanks, Paul, I realize that this is a long-term...

    Thanks, Paul, I realize that this is a long-term project and am just glad that you are thinking about it for the future. And totally agree about making sure it's rock solid to avoid dead Teensies.
    ...
  34. Id care about macOS and Linux.

    Id care about macOS and Linux.
  35. I do remember seeing this before, it's excellent...

    I do remember seeing this before, it's excellent work. Well done!

    I was throwing this out there to start a discussion about a way for Paul to be able to keep his business model of bootloader...
  36. A crazy idea for Teensy firmware updating

    One of the frequent requests on this forum is for a way to update teensy firmware from a source other than USB.

    I wonder if it would be possible in a future version to the bootloader chip to...
  37. I'd love to have that capability too.

    I'd love to have that capability too.
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    That's a really clear bit of documentation. Well...

    That's a really clear bit of documentation. Well done. Can I ask how you made it?
  39. Do you have any third-party virus, networking or...

    Do you have any third-party virus, networking or firewall software installed on your computer?
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    I meant to suggest this earlier: pads on the...

    I meant to suggest this earlier: pads on the bottom to provide access to the USB connector data pins. This allows for a design that has its own USB port for power/programming (USB-C anyone?)
  41. Can't reproduce here with Teensy loader 1.47 on...

    Can't reproduce here with Teensy loader 1.47 on High Sierra 10.13.6 with firewall on or off.

    Paul: is there any way to get the error result that prints that message?
  42. I can try to reproduce this here, but first I...

    I can try to reproduce this here, but first I assume you checked to see that this isn't an issue with the firewall configuration?
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    Excellent, @Simmic, thanks! I've tried importing...

    Excellent, @Simmic, thanks! I've tried importing this model into the KiCad footprints for Teensy 4. Here's what a 3d render looks like for the breakout board I've been working on:

    18097

    I...
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    Sounds great, @Dog-One! Can you give a little...

    Sounds great, @Dog-One! Can you give a little background on what changes you had to make to get it to build? I'd like to get it working under Arduino and PlatformIO.
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    Still an issue. Filed bug here...

    Still an issue. Filed bug here https://github.com/PaulStoffregen/cores/issues/401 so this doesn't get lost.
  46. Just saw this post about the next version of...

    Just saw this post about the next version of PlatformIO which has some VERY slick tools for investigating firmware symbols, memory allocations, static code analysis, etc.
    ...
  47. Thanks, Paul, that's super useful and clear. ...

    Thanks, Paul, that's super useful and clear.

    A couple of thoughts:

    Would it be possible to add the default values for the various fixed addresses?

    One note on the graphic: I puzzled over...
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    Another good suggestion. I'll add that to my...

    Another good suggestion. I'll add that to my next version!
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    Good point, I've added it to the OSHPark project...

    Good point, I've added it to the OSHPark project page for the latest design.
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    No good reason, they were like that in the...

    No good reason, they were like that in the original default footprint for the header that I used. Rounded them out:

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