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    Note, the Teensy 4.0/4,1 has separate pins for...

    Note, the Teensy 4.0/4,1 has separate pins for direct S/PDIF input and output. I haven't tried it out personally, but pin 14/A0 is the S/PDIF output, and pin 15/A1 is the S/PDIF input. The Audio...
  2. It really depends on the pinout and what...

    It really depends on the pinout and what precisely you use.

    I put a basic list of the things that are compatible between the Teensys in the unofficial wiki:

    ...
  3. For Teensy 3.2, 3.5, and 3.6 there is a separate...

    For Teensy 3.2, 3.5, and 3.6 there is a separate memory called EEPROM:

    https://www.pjrc.com/teensy/td_libs_EEPROM.html


    For the Teensy LC, 4.0, and 4.1, the EEPROM library uses the flash...
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    Well it is cached. So if the data is...

    Well it is cached. So if the data is concentrated in one spot, after the first time through the loop, it will be much faster. It should be faster than the current micro SD card using the default SD...
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    There is the memory on the board itself that is...

    There is the memory on the board itself that is similar in spirit to the Teensy 4.0 (except a few things are larger). For read-only sounds, you would initialize it as a large const char array, and...
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    In this case, I rarely use these batteries. When...

    In this case, I rarely use these batteries. When they came with a project, I just tossed them in the drawer. It was just as I was rearranging things, I decided to charge them up, and found they...
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    Small li-po batteries

    At the instance of my wife, I have been trying to organize my 'man cave' (otherwise known as the living room), and clear off all of the spaces that have various camera or electronic parts. To that...
  8. Bringing this thread back from the dead. I was...

    Bringing this thread back from the dead. I was over at Adafruit today looking at new products, and it looks like Adafruit will soon be selling the PSram chip. Hopefully their distributors,...
  9. You may know this, or perhaps you don't. On...

    You may know this, or perhaps you don't.

    On the Teensy 3.2, 3.5, 3.6, and LC, floating point constants are single precision rather than double precision. On the Teensy 4.0 and 4.1, constants are...
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    I missed that you were still trying to compile...

    I missed that you were still trying to compile the teensytransfer device. It can be rather tricky to build.

    If Windows has separate window for the Teensy downloader that pops up after you've...
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    You might mention what operating system you are...

    You might mention what operating system you are using, there might be OS specific things you need to do. Teensydunio 1.53 now checks if Linux has the correct udev rules, but I don't know if there...
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    SD card are all memory. It does not involve...

    SD card are all memory. It does not involve drive head positioning, etc. that a spinning disk might encounter.

    It would depend on whether the SPI driver for multiple SD cards can do DMA support...
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    One method is to use the Trainer4Edu breakout...

    One method is to use the Trainer4Edu breakout board:

    Description: http://www.trainer4edu.com/edubase_teensy/frdm_4236.html
    Board without USB host: https://oshpark.com/shared_projects/vzG532jm...
  14. Out of curiousity, what do you want to do with...

    Out of curiousity, what do you want to do with the camera? Do you want to use the Teensy to control the camera (turn it on/off, etc.) or do you want to do image processing on the Teensy? Bear in...
  15. As a coworker of mine used to say before he...

    As a coworker of mine used to say before he retired "It's a journey, not an event".

    If would be nice if we could use a common FILE base class among the filesystems, and for WAV/RAW/MP3/etc. files....
  16. I didn't test it. My main interest is in having...

    I didn't test it. My main interest is in having pre-recorded sounds and playing them. The test I used was the example Audio -> HardwareTesting -> SDCardTest, with the appropriate modifications for...
  17. I've tested both, and for reading a single file:...

    I've tested both, and for reading a single file:

    Teensy 4.0 using audio shield: 0.9 Mbyte/second;
    Teensy 4.0 using SD card via soldered pins: 1.2 Mbyte/second;
    Teensy 4.1 using built-in...
  18. Well one thought might be to use one of the real...

    Well one thought might be to use one of the real serial UARTs and hook that RX/TX to a serial to USB dongle, and then just read the new USB tty that is created by the dongle. I've not used one, but...
  19. Yes, I was going to suggest the Adafruit...

    Yes, I was going to suggest the Adafruit PowerBoost 1000C as well:

    https://www.adafruit.com/product/2465
    https://www.digikey.com/products/en?mpart=2465&v=1528


    If you don't draw more than...
  20. Well, I'm sure there are ways, but deep diving...

    Well, I'm sure there are ways, but deep diving into figuring out how to modify the file to incorporate an extra file, may involve learning many things about the Teensy environment.

    It is simpler...
  21. The simplest way is just to declare it as a...

    The simplest way is just to declare it as a 'const' array with static initialization (assuming the index is a simple non-negative number).
  22. Here is a previous post that I did to document...

    Here is a previous post that I did to document the pads underneath the Teensy and the 5 backrow pins:

    https://forum.pjrc.com/threads/60532-Teensy-4-1-Beta-Test?p=239712&viewfull=1#post239712
    ...
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    KurtE is right, there is no direct DAC on the...

    KurtE is right, there is no direct DAC on the Teensy 4.0 or 4.1.

    As he mentions, there is the MQS system that provides a simple DAC like interface. However, the downside is it uses fixed pins 10...
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    First there is the ILI9431_t3 library written by...

    First there is the ILI9431_t3 library written by Paul Stoffregen:

    https://github.com/PaulStoffregen/ILI9341_t3
    ...
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    You didn't mention what Teensy you have, or...

    You didn't mention what Teensy you have, or whether you want to use the USB port for just power, or whether you want to use it for programming the Teensy. If you don't need to program the Teensy...
  26. I have no idea in terms of the ADC speeds, but if...

    I have no idea in terms of the ADC speeds, but if you are sending stuff to the PC, note that before Teensy 4.0, the Teensys used USB 1.0 speeds (12Mbits/s maximum). Teensy 4.0/4.1 moves to USB 2.0...
  27. There are many different ways to do this. ...

    There are many different ways to do this.

    KurtE mentioned one board. The guy who makes them, actually has two different boards:

    ...
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    And if you still need a smaller platform,...

    And if you still need a smaller platform, consider the Teensy 4.0 instead of the 4.1.

    Note, be sure to study the pinouts between the Teensy 3.6 and either the 4.0 or 4.1. For example, the pins...
  29. As far as I know, the only alternates are pin 0...

    As far as I know, the only alternates are pin 0 or pin 38 being the preferred CS1 pin, and pin 1 or pin 39 being the MISO1 pin. So, the answer is no, with the outer row pins you've used, there is no...
  30. The Teensy 4.1 does NOT have alternate pins for...

    The Teensy 4.1 does NOT have alternate pins for the SPI buses, except for using SPI1.SetMISO(1) instead of using pin 39.

    <edit>
    Note, I left out the word NOT in the above sentence.
  31. Sure, in the Teensy 4.0 the micro SD pins are...

    Sure, in the Teensy 4.0 the micro SD pins are listed as:

    Pad 34 (MISO2)
    Pad 35 (MOSI2)
    Ground
    Pad 36 (CS2)
    3.3 volt
    Pad 37 (SCK2)
    Pad 38
    Pad 39
  32. Are you using either the micro-SD card or the...

    Are you using either the micro-SD card or the psram/flash memory pads underneath the Teensy 4.1?

    If you aren't using the micro-SD card, you could use something like this to bring out the SD pins:...
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    If you are willing to edit boards.txt to add...

    If you are willing to edit boards.txt to add linker options, you can use the wrap functionality of the linker:

    --wrap=symbol
    Use a wrapper function for symbol. Any undefined reference to symbol...
  34. Well caching introduces a nuance. Note, I...

    Well caching introduces a nuance. Note, I haven't looked in detail at the Teensy 4.x, but in terms of what I've seen over the years for other cached system, you need to consider the caching behavior...
  35. I have not used USB Host for anything other than...

    I have not used USB Host for anything other than running a mouse to see if I had the pins correctly installed. But it occurs to me, you might be able to use a USB <-> serial converter that is...
  36. The current generation of Teensys do not support...

    The current generation of Teensys do not support bluetooth directly. However, the company (nxp.com) that makes the chips inside of the Teensy (i.MXRT 1062 for Teensy 4.0/4.1) did recently acquire a...
  37. Great! Note in the Teensy 4.1 page, you have the...

    Great! Note in the Teensy 4.1 page, you have the link for the ethernet kit up top, but if you scroll down to the ethernet section, it only says the kit will be offered in the future.

    As I...
  38. Great, I was just going to ask when the kit would...

    Great, I was just going to ask when the kit would be available. Soldering a through hole capacitor is easier than SMT.

    I assume the resistors listed in the original OSH park board aren't needed?...
  39. And the other generic advice with I2C devices. ...

    And the other generic advice with I2C devices.

    The I2C bus needs pull-up resistors on the SCL (19) and SDA (18) pins. You only need one set of resistors on the I2C bus. Many newer Adafruit and...
  40. In all cases, you need to inter-connect the...

    In all cases, you need to inter-connect the ground wires between the Teensy and the Pi, so that a circuit can be made.

    If you need the two to be electrically separate you can use an opto-coupler. ...
  41. I would think of using satellite processors to...

    I would think of using satellite processors to control a subset of the signals. The main teensy talks to each of the satellites and tells it what to do with a special protocol (serial, spi, maybe...
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    Technically you only need to do it if you plan to...

    Technically you only need to do it if you plan to plug in a USB cable and provide external power at the same time. If you only provide one power source, then you don't need to cut the solder pads.
  43. Note on the Teensy 3.2 pin #1 is the normal pin...

    Note on the Teensy 3.2 pin #1 is the normal pin for Serial1 TX1, and pin #5 is an alternate pin for the same serial line. I would imagine each of the different WS2812Serial strips need to use...
  44. Whoops, that should be you will need to use...

    Whoops, that should be you will need to use 'SPI1.setMISO(1)'.

    In terms of 'favored' CS1 pin (i.e. 0 on both Teensy 4.0 and 4.1 and also pin 38 on the Teensy 4.1), only a few devices seem to use...
  45. In the Teensy 4.0: There are 28 pins on the...

    In the Teensy 4.0:

    There are 28 pins on the outer edges;
    There are 5 pins at the back;
    Pads 24 - 33 are underneath the back of the Teensy 4.0 with a 2.54mm pitch;
    Pads 34 - 39 are...
  46. You do have 2 additional serial ports if you are...

    You do have 2 additional serial ports if you are able to solder wires to the pads underneath the Teensy 4.0. I have found if I just solder wires directly to the pads, over time they come off.

    if...
  47. As I said, if you don't have a section attribute,...

    As I said, if you don't have a section attribute, the compiler will create a section name with either ".text.", ".data.", or ".rodata." prefixes before the function name. Note, in C++ (the Arduino...
  48. One way would be a PCB that mounts underneath ...

    One way would be a PCB that mounts underneath the Teensy, connecting the 6 pins from the ethernet, 5 pins from USB host, VUSB, and VIN. These would be soldered directly to the Teensy with normal...
  49. The simplest way as wwatson says is to use...

    The simplest way as wwatson says is to use USBHost_t36 -> examples -> Serial -> Mouse -> Mouse.ino. Plug in a 5 pin cable that has a USB B port on the other side, such as the cable PJRC.COM sells,...
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    I would not recommend the original C manual any...

    I would not recommend the original C manual any more. Too much has changed since it was published. Instead one of the newer books that at least starts with ISO C99 would be a better book.

    And...
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