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  1. In terms of #2, SD cards and micro-SD cards above...

    In terms of #2, SD cards and micro-SD cards above 32 gigabytes are SD-XC cards (1-32GB are SD-HC cards). Generally, above 32 gigabytes, the VFAT filesystem is not used. Instead a new filesystem...
  2. Here is a list of Teensy 4.0 break-out boards...

    Here is a list of Teensy 4.0 break-out boards (Loglow/Talldog, Blackketter, and Trainer4EDU had boards with USB host IIRC):

    https://github.com/TeensyUser/doc/wiki/Teensy-4.0-breakout-boards

    ...
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    Note, if the touch system uses the same SPI bus...

    Note, if the touch system uses the same SPI bus as the display, you might need to add pull-up resistors on the two CS pins (display & touch):

    ...
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    I believe inttypes.h were added in C99, and I...

    I believe inttypes.h were added in C99, and I think C++11. I left the C standards committee between the C90 and C99 standards, so I don't recall exactly when it got added. It relies on string...
  5. This is one of those things where the answer is...

    This is one of those things where the answer is it depends.

    Note the prop shield is mono only. It has a built-in amplifier so that you can hook up a single 2watt 4/8ohm speaker directly. It has...
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    Yes, I was just going to post this also. The...

    Yes, I was just going to post this also. The shorter board (for the LC, 3.2, and 4.0) is available now, while the longer board (for the 3.5, 3.6, and 4.1) is available as a pre-order (which must be...
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    If you have some skill in soldering perhaps using...

    If you have some skill in soldering perhaps using the Adafruit feather wing system might give you some results more quickly.

    For example, if you have the following, you can put them together and...
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    I suspect it may be complex for a complete...

    I suspect it may be complex for a complete beginner.

    The PCB itself is fairly simple. There are 10 buttons that need to be soldered in. These buttons connect to specific pins in the 2x20 pin...
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    It might help if you include a link to the PCB...

    It might help if you include a link to the PCB board and possibly other documentation in your questions.
  10. Have you validated that your external power...

    Have you validated that your external power source is providing enough power? I could imagine that motors starting and stopping might provide a bump in the power, and the Teensy may be in a brownout...
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    FWIW, I've written a sketch that can measure...

    FWIW, I've written a sketch that can measure power output, that I'm using to measure how much power is used by my Olympus and Panasonic cameras with external power under some circumstances. At the...
  12. As defragster says the product page for the audio...

    As defragster says the product page for the audio shield includes the two different shields. You want shield revision C for the Teensy 3.1, 3.2, 3.5, and 3.6. You want shield revision D for Teensy...
  13. Defragster answered already, but by socket, I...

    Defragster answered already, but by socket, I meant the through hole pin slot, next to pin 38 and in front of the micro-SD card reader.

    Unfortunately, those pins do not have labeling on the PCB. ...
  14. The Teensy 4.0/4.1 have an additional method,...

    The Teensy 4.0/4.1 have an additional method, that may be useful depending on what you want to do.

    There is a socket on the Teensy 4.0 back row of pins, and the interior row of pins on the Teensy...
  15. At the simplest, just attach a JST-PH connector...

    At the simplest, just attach a JST-PH connector to VIN and Ground. On the Teensy 4.0 and 4.1, you can use the ground pin between VIN and 3.3v or the other two ground pins (one next to pin 0 on the...
  16. Yeah, I miss read the pinout. I thought there...

    Yeah, I miss read the pinout. I thought there were separate power poles for each of the sub I2C buses. I don't see how it could do voltage translation without having a power for the output, and 8...
  17. Maybe it will work with 10K pull-ups, maybe it...

    Maybe it will work with 10K pull-ups, maybe it won't. I'm a software guy, but IIRC, it depends on the total length of the I2C bus, the number of devices on the bus, how well the wiring conducts...
  18. I haven't used it, but it looks compatible: ...

    I haven't used it, but it looks compatible:

    It has 10K pull-up resistors, so you won't need to add pull-up resistors on the Teensy;
    It can run at 3.3v voltage level;
    It claims to be able...
  19. Ummm, the Teensy has a USB micro-B port, not a...

    Ummm, the Teensy has a USB micro-B port, not a USB-C port. Similarly, the Pi Zero and Pi Zero-W were powered with USB micro-B.

    Running blink, I get about 70mA on the Teensy 3.6 and perhaps 100mA...
  20. It depends on where/when you buy it, and whether...

    It depends on where/when you buy it, and whether you are just buying the pi zero alone, or with other things to cover the cost of shipping.

    The US chain Microcenter, no longer sells the plain...
  21. 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...
  22. 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 ->...
  23. 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...
  24. 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...
  25. 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...
  26. 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...
  30. 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...
  31. 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...
  32. 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...
  33. 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...
  34. 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...
  35. 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...
  37. 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:...
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    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...
  48. 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...
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