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  1. Unfortunately there are pin overlaps between the...

    Unfortunately there are pin overlaps between the two boards. You might be able to do it if you don't connect certain pins on the audio board (6, 7, 12, 13, 14, 15). You might have an ordering...
  2. It probably depends on how complex the software...

    It probably depends on how complex the software you run on the laptop is.

    I haven't done anything with visualizers (or input at all), but if you go to the Audio -> Analysis ->...
  3. I put the following entry in the unofficial wiki...

    I put the following entry in the unofficial wiki to document many of the inter-Teensy compatibility issues:

    https://github.com/TeensyUser/doc/wiki/Teensy-Compatibility


    Basically as KurtE...
  4. Bear in mind I know nothing of the RFID reader,...

    Bear in mind I know nothing of the RFID reader, only what you posted.

    There are some SPI devices that do not have a CS pin. In this case, you need to do something so that the device does not see...
  5. If the RFID reader does not have a CS pin, you...

    If the RFID reader does not have a CS pin, you likely are hosed using hardware SPI. I could imagine having a transistor that controls whether the SCLK pin goes to the RFID unit. I.e. when you are...
  6. Paul has this paper on better SPI bus design that...

    Paul has this paper on better SPI bus design that covers issues that you see when you have more than one device on the SPI bus.

    https://www.pjrc.com/better-spi-bus-design-in-3-steps/

    ...
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    This is sort of off topic for the main thread,...

    This is sort of off topic for the main thread, but In terms of USB-C PD, I just put in an order for my first USB-C PD gear (wall charger, battery, and PD trigger to get access to the power).

    I...
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    IIRC, Paul mentioned something about writes to...

    IIRC, Paul mentioned something about writes to the digital pins being throttled some time back. I recall there was some magic if you truly need that speed (which it sounds like you might).
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    The Arduino UNO processors (from which Teensy...

    The Arduino UNO processors (from which Teensy derives some of their pinouts) had the same issue with pin 13 being both SCLK and and the built-in LED.

    In theory, other than flashing the LED, there...
  10. Paul posted this link some time ago about typical...

    Paul posted this link some time ago about typical problems encountered with multiple SPI devices on the same bus:

    https://www.pjrc.com/better-spi-bus-design-in-3-steps/


    With my uncanny eyes...
  11. For pull-up resistors, this post assumes you have...

    For pull-up resistors, this post assumes you have through hole resistors and not SMT resistors that you have to solder.

    Assuming the Teensy is in a breadboard, take one of the resistor's wires and...
  12. 2.2K is the minimum value needed for 3.3v bus...

    2.2K is the minimum value needed for 3.3v bus systems. 4.7K is the minimum value needed for 5v systems. You can have larger resistors (like 10K). The larger the resistors (either a larger single...
  13. The trouble is there are so many devices that...

    The trouble is there are so many devices that implement I2C.

    Unfortunately for Teensy 3.x/LC <-> Teensy 3.x/LC I2C, you WILL need to add pull-up resistors. You need at least one set of pull-up...
  14. It is one of those things where the answer is it...

    It is one of those things where the answer is it depends on the board and your Teensy.

    If your board needs 5v power and 5v I2C signals, then yes you need a voltage level shifter.

    If your board...
  15. It is in the same place as on the other Teensy's....

    It is in the same place as on the other Teensy's.

    Looking at this picture of the bottom of the Teensy 4.1:...
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    IIRC, except for MISO1 (either pin 39 or pin 1),...

    IIRC, except for MISO1 (either pin 39 or pin 1), I didn't think the Teensy 4.x had alternate pins, like the Teensy 3.x microprocessors have.

    Maybe it is matter of terminology. The Teensy 4.x have...
  17. As a minor follow-up, I still could not find the...

    As a minor follow-up, I still could not find the featherwing version of the INA219, but my local MicroCenter had one, and I picked it up, along with a replacement mark II 128x32 OLED screen (the mark...
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    The 6.0.0 alpha release does support the Teensy...

    The 6.0.0 alpha release does support the Teensy 4.1. Presumably whenever 6.0.0 is released, it will be listed as fully supported.
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    And of course make sure that you have a USB cable...

    And of course make sure that you have a USB cable that passes data, and is not just a charging cable that only provides power.
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    Assuming Circuit Python will do for python, CP...

    Assuming Circuit Python will do for python, CP has been supported on Teensy 4.0 for awhile now. Teensy 4.1 support is in the 6.0.0 alpha releases:

    Teensy 4.0:...
  21. Unfortunately at the moment, Adafruit is sold...

    Unfortunately at the moment, Adafruit is sold out.

    Digikey has the Adafruit part in their list, but they haven't gotten stock yet. Checking the lead time, it looks like they don't expect to get...
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    IIRC, newer Arduino shields should be able to run...

    IIRC, newer Arduino shields should be able to run with either 3.3v or 5v power. The Teensy would run the shield at 3.3v. Older shields are 5v only, and you probably want to use just the Teensy 3.2...
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    I put this page on the unofficial wiki about...

    I put this page on the unofficial wiki about Teensy compatibility:

    https://github.com/TeensyUser/doc/wiki/Teensy-Compatibility
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    When I did my test, I just used an adafruit...

    When I did my test, I just used an adafruit amplifier and speaker. I don't remember exactly the setup. Perhaps it was one of the amplifiers and two speakers:

    Amplifier #1:...
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    Unfortunately the seller is on vacation until the...

    Unfortunately the seller is on vacation until the end of September:

    https://www.tindie.com/products/cburgess129/arduino-teensy4-teensy-40-expansion-board/


    I bought the revision 1 board and...
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    AFAIK, there is only one MQS sub-system in the...

    AFAIK, there is only one MQS sub-system in the processor used in the Teensy 4.0/4.1. The only pins that are brought out in the Teensy are pins 10/12.
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    As Paul says, there is the MQS Audio Output. ...

    As Paul says, there is the MQS Audio Output. Note, MQS uses pins 10 and 12, which means you might not be able use the main SPI port (pin 12 is MISO, and pin 10 is the common CS pin). There is a...
  28. Lets start with the basics. What brand of...

    Lets start with the basics.

    What brand of micro SD card is it? How many megabytes or gigabytes does it support? Can you read the file on another system? How was the card formatted?

    Micro SD...
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    The Teensy 4.0 should have the same size as the...

    The Teensy 4.0 should have the same size as the Teensy 3.2.

    The Teensy 4.1 should have the same size as the Teensy 3.5/3.6.

    If these cases have electrical connections, be sure to compare the...
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    Back when I used those displays, some of the...

    Back when I used those displays, some of the displays I had would only run if feed 5v of power and not 3.3v. There are some boards that do a proper bi-directional level shift for I2C, but with...
  31. As expected, after buying a pair of the sensors...

    As expected, after buying a pair of the sensors from ebay, I did find one of the INA219 chips I had bought previously last night. I found the stand-alone version. I haven't found the featherwing...
  32. Well yes, there is the other stuff as well. I...

    Well yes, there is the other stuff as well. I have one dresser with 7 drawers (all filled) and one large space that some of the boxes go in:

    2 drawers to hold my current cameras, lenses, etc. ...
  33. Well, I'm starting to go through all of the...

    Well, I'm starting to go through all of the combined boxes, and sort things out. But I guarantee I will find it shortly as I just bought 2 more from fleabay :D

    But in terms of boxes, this won't...
  34. I have lots and lots of boxes, and a label maker....

    I have lots and lots of boxes, and a label maker. The trick is to put everything in the boxes, and then don't lose the box. And don't put things into one box, with the hope of getting to it...
  35. Arghhh, I need to get more organized

    This is just a rant.

    I buy things every so often and put them in one of my someday boxes, but when it comes to actually using the feature, the someday box has disappeared. And it doesn't help...
  36. Cool, good to know. Thanks. More stuff to put...

    Cool, good to know. Thanks. More stuff to put in my ever growing spreadsheet of all Teensy pinouts. We really need to get this documented in the official documentation (and the unofficial twiki)....
  37. Well it is the promptly serviced thing that can...

    Well it is the promptly serviced thing that can be an issue. IIRC, the Teensy 4.x has 4 byte hardware FIFOs on all serial UARTs. So you have to make sure that interrupts can be serviced before the...
  38. The one potential trouble with serial on the...

    The one potential trouble with serial on the Teensy 4.x's is you might want to use hardware flow control to make sure either buffer doesn't overflow. However, you only have 2 choices for the CTS...
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    Note, I would imagine that if you hooked up: ...

    Note, I would imagine that if you hooked up:

    Teensy 3.3v to waveshare 3.3v;
    Teensy ground to waveshare ground;
    Teensy pin 12 to waveshare MISO (DO);
    Teensy pin 11 to waveshare MOSI...
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    That makes sense. I can imagine that in normal...

    That makes sense. I can imagine that in normal development you would likely be modifying the M7 board or the M4 board. And it certainly simplifies things in terms of the toolchain. I was thinking...
  41. It is likely due to the library having bigger...

    It is likely due to the library having bigger buffers, and overhead in general for the Teensy 4.x new features, etc. Note, the memory layout on the Teensy 4.x is different from the Teensy 3.x.
    ...
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    IIRC, each has their own main memory, so I tend...

    IIRC, each has their own main memory, so I tend to view it as similar to two independent chips talking via serial lines. I.e. I would imagine the main processor will just have a larger flash memory,...
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    One other thought is perhaps the library people...

    One other thought is perhaps the library people should be thinking of ways to use the secondary processor in parallel to the main Teensy. Obviously this will take a lot of time after the Teensies...
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    I'm not sure exactly what you mean for the...

    I'm not sure exactly what you mean for the layout. If you mean a board that doesn't have holes per se, but just has castellated edges for soldering into a PCB, that may alienate some users if it was...
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    One minor thing that would be useful is having...

    One minor thing that would be useful is having solder jumpers that would add pull-up resistors for the I2C ports.

    One of the things I might wish for is an update to the prop shield:

    A simple...
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    Obviously, everybody has a grab bag of favorite...

    Obviously, everybody has a grab bag of favorite features. But I tend to think there are limits about what can be done.

    I tend to think some of the constraints might be:

    PJRC.COM is a small...
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    While I agree having h/w support is nice, have...

    While I agree having h/w support is nice, have you used the software GDB support on the Teensy 4.0/4.1?

    ...
  48. Or even simpler, do not attach the SPI/CS pins to...

    Or even simpler, do not attach the SPI/CS pins to the audio adapter. Only attach the pins used by I2S or I2C devices, plus the power/ground pins.

    Note however, if you aren't using the SPI pins...
  49. I can't, but I'm sure others can. As I said, I...

    I can't, but I'm sure others can. As I said, I imagine for visualization, that a plain analog microphone might be sufficient. I'm mostly just a dabbler.
  50. One minor comment about the pinout. There are...

    One minor comment about the pinout. There are likely very good reasons for using it (flexio, dma, etc.) but using pin 8 would make it harder for a Teensy 4.0 to handle sound input via an I2S...
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