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  1. I'm only really missing one specific pin from the...

    I'm only really missing one specific pin from the Teensy 4.0: RESET

    Apart from that, I'd really love to be able to attach inexpensive LCD displays and take advantage of the 2D graphics...
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    Also, I should have noted earlier that after the...

    Also, I should have noted earlier that after the USB serial lockup my larger application continued to work.

    In fact, USB serial writes from Teensy to host continue to work and loop() continues to...
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    Alright! Thanks! With that test the ISR...

    Alright! Thanks! With that test the ISR blinking continues to work even after the USB serial is locked up. And no HardFault blinking.
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    I'm not following. Something to test?

    I'm not following. Something to test?
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    Thanks defroster, but alas, no. A single blink...

    Thanks defroster, but alas, no. A single blink when it start, then it locks up as above without any blinks.
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    Once it locks up I can't unlock it with further...

    Once it locks up I can't unlock it with further transfers. With your example code, shorter sends to the Teensy work fine (led goes on, then goes off a couple of seconds later), but once a large...
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    macOS Mojave 10.14.6

    macOS Mojave 10.14.6
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    Thanks, defragster. I did try your changes to no...

    Thanks, defragster. I did try your changes to no avail.

    I suspect that the issue outlined at https://forum.pjrc.com/threads/57325-Teensy-4-0-Serial-available()-stops-incrementing is the same...
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    Teensy 4.0 USB serial lockup

    I think I'm seeing a bug in usb_serial on Teensy 4.0. When I try sending a block of text larger than 2413 bytes via the serial port, it locks up. Here's the sketch:

    #include <Arduino.h>

    void...
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    The breakout board discussed here...

    The breakout board discussed here https://forum.pjrc.com/threads/57672-Another-Teensy-4-0-Breakout-Board uses castellated pads like in that photo.

    If you are using KiCad, the footprint used by...
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    One more thought: I don't see why the teensy...

    One more thought: I don't see why the teensy itself shouldn't continue to work and can't think of a reason that the castellated pads that you soldered wouldn't work, though on the wrong side of the...
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    I just updated the design with the new silkscreen...

    I just updated the design with the new silkscreen warning, and iit also brings out ground to the pins for USB. I haven't ordered one yet but I think it should be ok.
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    DOH! So sorry, I nearly did that myself. I'll...

    DOH! So sorry, I nearly did that myself. I'll update the design with a silkscreen note that says "This side faces Teensy!"
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    Glad to hear you got a (mostly) working board. I...

    Glad to hear you got a (mostly) working board. I just checked my pin 34 (ie. the top left pin on the breakout board and it seems to work fine by toggling it on and off in software. I don't see an...
  15. This is great, nice work! Did you consider...

    This is great, nice work! Did you consider access to the USB pins? I wonder if there's a way to add a USB port here...
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    I packaged a teensy compatible library that...

    I packaged a teensy compatible library that provides version of Lua with basic REPL. It's really just a proof of concept now, but might be useful to you. Happy to put a little more work into it if...
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    Looking at the usb_serial.h header file, I see...

    Looking at the usb_serial.h header file, I see the following methods for usb_serial_class which is what Serial is:



    uint8_t dtr(void) { return (usb_cdc_line_rtsdtr & USB_SERIAL_DTR) ? 1...
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    The edge cuts are generally milled out...

    The edge cuts are generally milled out mechanically. I think that a laser to cut the boards would need to be pretty powerful.

    I know that the flex boards that OSHPark does are cut with a laser,...
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    I've gotten the SD card sidecar and the USB Host...

    I've gotten the SD card sidecar and the USB Host sidecar in .8mm and the ESP32 sidecar in 1.6mm. Assembled and all working fine. I haven't tested the 3.3v regulator on the ESP32 board yet, running...
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    Adafruit has gotten the Audio library to work...

    Adafruit has gotten the Audio library to work with some of their boards, I don't' think that includes any ESP32 support, but it may be possible.

    https://github.com/adafruit/Audio
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    ESP32 has dual cores that pretty easy to use,...

    ESP32 has dual cores that pretty easy to use, with the help of FreeRTOS. Here's a simple tutorial: https://randomnerdtutorials.com/esp32-dual-core-arduino-ide/
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    I wrote to OSHPark and included the picture from...

    I wrote to OSHPark and included the picture from above and got this response right away:



    They did tell me when I asked about castellations earlier that they couldn't guarantee it. I went...
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    Sorry about that, guys! I suspect that it's...

    Sorry about that, guys!

    I suspect that it's related to the thinner material. I haven't yet ordered the thinner ones, I'll do it now, along with another set of thicker ones.

    @DerekR: The...
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    The USB Host daughter card I'm working includes...

    The USB Host daughter card I'm working includes the capacitors and the protection chip provides reverse current flow and ESD protection, but not any voltage regulation. This circuit was lifted from...
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    Yeah, they are. With ample flux and a little...

    Yeah, they are. With ample flux and a little cleanup from excess solder with a braid mine went pretty easy.
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    Suggestion: Upgrade connector to USB-C. I...

    Suggestion: Upgrade connector to USB-C.

    I have a Teensy with a failing micro USB connector and have been impressed by the mechanical improvements of USB-C, not the least of which is that it works...
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    My USB host and SD boards come 10/4. ESP32...

    My USB host and SD boards come 10/4. ESP32 boards next week. I think I've got all the other parts, thanks for your post, I should double check.
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    I think a Teensy 4.1 with the same form factor as...

    I think a Teensy 4.1 with the same form factor as a Teensy 3.6 would be really great. And to the extent that you can replicate the pins so that existing designs can upgrade to Teensy 4.x from Teensy...
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    The ESP32 breakout board, when attached to the...

    The ESP32 breakout board, when attached to the bottom mounted Teensy4 header breakout board provides a serial connection via Serial6 and uses digital pins 26 and 28 to control the ESP32 pins IO0 and...
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    That sounds like a reasonable approach, though if...

    That sounds like a reasonable approach, though if they are connected by a serial port it might be slow, depending on how many primitives it takes to draw your screen...
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    One more crazy idea. The bottom right set of...

    One more crazy idea.

    The bottom right set of pins (25/RX6,26,28,24/TX7,3.3v,GND,PROGRAM and ON/OFF) could support a serially connected ESP32 breakout board.

    The one I'm working on uses an...
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    GitHub repo has an updated BOM with digikey part...

    GitHub repo has an updated BOM with digikey part numbers. I realized that the diodes aren't necessary and updated the design. For the board up on OSHPark, just short out the pads for one of the...
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    There's a nifty, interactive BOM on the github: ...

    There's a nifty, interactive BOM on the github:

    https://raw.githubusercontent.com/blackketter/teensy4_usb_host_breakout/master/bom/ibom.html

    Unfortunately you need to download it to your...
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    After some minor tweaks, I uploaded and ordered a...

    After some minor tweaks, I uploaded and ordered a first prototype:

    GitHub Repo

    OSHPark, $2.85!
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    Another day, another board. Here's a mini...

    Another day, another board. Here's a mini breakout board for the other side to do USB Host.

    17662
    (Sorry there's no 3D model for the USB connector.)

    Schematic, based on Teensy 3.6 design:...
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    Thanks for the information. I'd love to hear...

    Thanks for the information. I'd love to hear @PaulPaulStoffregen on this topic as his original breakout board didn't have either.

    If you test it the board, please report back your experience on...
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    Hm, I don't think so. I used the Teensy 3.6...

    Hm, I don't think so. I used the Teensy 3.6 schematic as an example (thanks Paul!) and I don't see a cap there. Could be wrong, would be happy to add it.

    I know that several caps are needed for...
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    I was thinking about doing another similar board...

    I was thinking about doing another similar board for the other side with a USB A host connector and TPD3S014 current limit switch.

    BTW: I've ordered the SD breakout and posted it here.
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    Wow, great minds think alike! I started working...

    Wow, great minds think alike! I started working on just this kind of thing and then read your message, @defragster!

    17648

    The idea is that it would stack on the existing board with a header...
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    That's what I'd do. Should be easier to solder...

    That's what I'd do. Should be easier to solder and standard pin headers should protrude though the Teensy holes a bit more.
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    I'm not sure when I'll be uploading another...

    I'm not sure when I'll be uploading another order, but you can grab the latest version here and upload it to OSHPark to order it directly.

    Otherwise, hooking up the ground pins should be pretty...
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    Just the GND pin with the change suggested by...

    Just the GND pin with the change suggested by @defragster.




    That's right. There's no ESD or power protection there. @loglow's board would be better in this situation.



    Great, please...
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    That's right. I'm adding a note to this effect...

    That's right. I'm adding a note to this effect on the Github page.


    Right. Only cut it if you need it cut. And do it before you solder the thing together and can't anymore. Like I did. :)
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    The idea is that you solder from the top of the...

    The idea is that you solder from the top of the sandwiched boards. The inner pins are soldered directly to the Teensy, the outer row is soldered directly to the breakout board. which connects to...
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    Thanks! And that's a brilliant observation on...

    Thanks!

    And that's a brilliant observation on the header connector. I'll make the change to the design now.
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    Another Teensy 4.0 Breakout Board

    I've just got back a Teensy 4.0 breakout board that I ordered from OSHPark and thought I'd post about it.

    This board solders directly to the back of the Teensy 4.0 and uses some castellated...
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    Funny, I was thinking the same thng. There are...

    Funny, I was thinking the same thng.

    There are a number of wifi modules that use a SDIO standard as the interface to a host, but I think these are largely not used anymore. The EyeFi product was...
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    I've been thinking the same thing, jasper. The...

    I've been thinking the same thing, jasper. The Adafruit Airlift products https://learn.adafruit.com/adafruit-airlift-breakout look like a reasonable solution.

    I'm currently designing a board with...
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    Awesome, thanks!

    Awesome, thanks!
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    Teensy 4.0 3.3v maximum current?

    I can't seem to find a reference to the maximum capacity of the 3.3v regulator in Teensy 4.0.

    What's the maximum current that should be drawn by external circuitry on the 3.3v pins on Teensy...
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