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  1. You can only switch to specific pins. I.e. you...

    You can only switch to specific pins. I.e. you can switch Serial1 TX to 53 and Serial1 RX to 52 but not random other pins.
  2. I believe it is like the Teensy 3.x, where there...

    I believe it is like the Teensy 3.x, where there are certain pins used by the hardware by default, but you can tell the library to use the alternate pins.


    See:...
  3. I don't really know the details under the hood,...

    I don't really know the details under the hood, but the Smartmatrix shield on the Teensy 3.1/3.2/3.5/3.6 uses different pins for the Smartmatrix shield on Teensy 4.0/4.1. I suspect you probably need...
  4. It is the Teensy 4.0/4.1/micromod microprocessor...

    It is the Teensy 4.0/4.1/micromod microprocessor that doesn't support AGND. I assume it was a cost/benefit calculation when the NXP designers laid out the chip. Just like why the chip doesn't have...
  5. You will also need these pins: 3.3v ...

    You will also need these pins:

    3.3v
    Ground pin between 3.3v and VIN pins
    I don't think you need VIN, but it probably doesn't hurt to add it also.


    If you want to use either the flash...
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    The only trouble with recommending a Teensy...

    The only trouble with recommending a Teensy 3.2/3.5/3.6 right now is evidently the supply is getting thin due to the global chip shortage. Paul has said in another post that PJRC has run out of...
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    While you would have to re-design the pin layout...

    While you would have to re-design the pin layout and go to a larger form factor, note the Teensy 4.1 has more digital pins available (42) without having to solder to get at the pads underneath the...
  8. Just get the Audio Shield Rev C. That is...

    Just get the Audio Shield Rev C. That is compatible with the Teensy 3.1, 3.2, 3.5, and 3.6. IIRC, the original Teensy 3.0 and LC did not have the appropriate sound support or instructions to run...
  9. I missed the part about not knowing how to...

    I missed the part about not knowing how to solder. Frankly, if you haven't done any soldering before, soldering the Teensy 4.0 SD pins is a bit harder than the normal through hole soldering because...
  10. Well, if you haven't bought the Teensy 4.0 yet,...

    Well, if you haven't bought the Teensy 4.0 yet, one option is to get the Teensy 4.1 instead. The Teensy 4.1 has a built-in SD card reader, and I can verify that it does work with the smart shield. ...
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    Ummm, as I said above, yes the x86 has...

    Ummm, as I said above, yes the x86 has instructions to do sine and cosine instructions in hardware, but these instructions are microcoded which means they are slow. They also do not return correct...
  12. Unfortunately the 3.2 audio shield uses pin 9 for...

    Unfortunately the 3.2 audio shield uses pin 9 for BRCLK (one of the I2S clock bits). Pin 9 is normally the receive port for Serial2. There is an alternate pin that can be used for the Serial2...
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    Not really. Yes, the 387 and later floating...

    Not really. Yes, the 387 and later floating point units had the "fsin", etc. instructions for doing sine calculations using the 387 floating point stack. But GCC no longer generates code to use the...
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    Yes it has the SGTL5000. But in the table of I2C...

    Yes it has the SGTL5000. But in the table of I2C addresses that I have for various devices, I noted that it also had the WM8731 I2C device. I don't recall at this point what the reason for this was.
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    The Audio board has 2 I2C devices. The SGTL5000...

    The Audio board has 2 I2C devices. The SGTL5000 is at 0x0A and the WM8731 is at 0x1A. The audio shield has pull-up resistors for the I2C pins, so you don't have to worry about adding them.
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    FWIW, I noticed Adafruit just added a bunch of...

    FWIW, I noticed Adafruit just added a bunch of micro SD cards that specifically aren't SD-HC or SD-XC based,


    64MB: https://www.adafruit.com/product/5249
    128MB:...
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    Well yes and no. I usually don't buy new cards...

    Well yes and no. I usually don't buy new cards for sound type projects, I just grab whatever cards I happen to have lying around. Typically, I might only have 1-2 files on the card. It can be...
  18. You are right, pin 20/A6 is used for I2S (LRCLK1...

    You are right, pin 20/A6 is used for I2S (LRCLK1 in particular). Sorry I missed that. The trouble with using pin 10 is the audio board uses that for the micro-SD card on the audio board. This...
  19. Yes MOSI is what Sparkfun refers to as DATA in...

    Yes MOSI is what Sparkfun refers to as DATA in the hookup guide.

    You want pin 2 for RST, not 15 if using the audio shield. Pin 15/A1 is hooked up to the audio shield for attaching a...
  20. Unfortunately, the TeensyView is the only display...

    Unfortunately, the TeensyView is the only display I can think of that is made to plop directly on a Teensy 3.x and 4.x series and work with the audio board. You would need to use the following pin...
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    I've used the Pololu voltage regulators in the...

    I've used the Pololu voltage regulators in the past (note, I haven't used these specific regulators, as I tend to prefer the step-up/step-down regulators that can handle 3-11v, and only need 500mA to...
  22. Yes, and the MA Microcenter used to spread the...

    Yes, and the MA Microcenter used to spread the products over a wall and 1-2 shelves, and most of it has been moved to just the wall, freeing up the shelves for other things. But the problem is there...
  23. I know this is an old thread, but I finally got...

    I know this is an old thread, but I finally got to Microcenter in Cambridge, Massachusetts this last weekend.

    Their wall of microprocessors was even more chaotic than it was in the past, with...
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    No, you don't want to connect the battery to...

    No, you don't want to connect the battery to 3.3v, since the usual lipo battery produces 3.7-4.2 volts, and putting anything over 3.3v on the 3.3v line will probably damage the Teensy.

    I haven't...
  25. As long as you don't use pin 15, it shouldn't be...

    As long as you don't use pin 15, it shouldn't be a problem. Note, there is a resistor and capacitor on pin 15, that may or may not cause an issue if you use pin 15 for something else than analog...
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    Note, I am a software guy, if somebody who is a...

    Note, I am a software guy, if somebody who is a EE replies with a different answer, believe them.

    Unless you cut the trace, VIN and VUSB are connected together. So if you apply power to the VIN...
  27. You can use the pre-defined macros: '__DATE__'...

    You can use the pre-defined macros: '__DATE__' and '__TIME__' that give you the date and time the module was compiled:


    const char date_time[] = __DATE__ " " __TIME__;
  28. It kind of depends on how big you want the...

    It kind of depends on how big you want the boards, which Teensy is the base, whether you would be starting with the Micromod board or the normal 28 or 48 pin Teensies.

    I tend to like to have...
  29. I haven't been to Micro Center in a few months,...

    I haven't been to Micro Center in a few months, mostly due to medical issues.

    In the past in the Cambridge Massachusetts MicroCenter, there is generally one aisle (2 parallel shelves facing each...
  30. Just to be clear, when I said 2 digits of...

    Just to be clear, when I said 2 digits of accuracy, I meant total digits (i.e. 9.1 volts instead of 9.10 volts).
  31. Thanks, I will check into those. That mains...

    Thanks, I will check into those. That mains supply from Amazon looks rather big.

    In terms of the push/pull DC converters, I was worried about them being able to handle > 1 amp of power. I guess...
  32. Is there a cheap precise variable A/C -> D/C power supply (up to 12v and 3a)?

    This isn't quite teensy related, but perhaps people know of an appropriate D/C power supply, it would be nice. I've been doing some runs at testing how much power my digitial cameras consume when...
  33. The I2S pins in Teensy 4.x completely changed...

    The I2S pins in Teensy 4.x completely changed compared to the Teensy 3.2.

    In addition on the Teensy 3.2 two of the SPI pins needed to be relocated. On the Teensy 4.x, you use the standard SPI...
  34. This is just a guess. I think it would work...

    This is just a guess.

    I think it would work since you use the prop shield and not the audio shield. The audio shield uses pin 23/A9, so if you used the audio shield, pin 23/A9 would not be...
  35. As defragster mentions, the Teensy 4.x does not...

    As defragster mentions, the Teensy 4.x does not have a DAC for doing simple audio. If you don't want to use SPI (including accessing the flash memory in the prop shield), you could use the MQSL (pin...
  36. Good point. I mostly use the Stemma speaker for...

    Good point. I mostly use the Stemma speaker for Teensy 3.2/3.6 where I have a built-in DAC, and I don't use the audio shield.
  37. Using line-out with an amplifier and speaker will...

    Using line-out with an amplifier and speaker will certainly work. If you want simplicity, and you don't need to fill an entire room, you can get various speakers that are made to plug into the...
  38. I think non-superuser users can only edit a post...

    I think non-superuser users can only edit a post for about an hour or so after it gets posted (you would need to edit the first posting in the thread).
  39. Unfortunately, the Teensy is not an Arduino Uno...

    Unfortunately, the Teensy is not an Arduino Uno that did not have native USB support and it used a secondary port on the board that used pins 0/1. The USB communication path is completely different...
  40. You are welcome. It is a thing (waiting until...

    You are welcome. It is a thing (waiting until the USB serial connects) all of us have done from time to time.
  41. The reason nothing happens is this line in the...

    The reason nothing happens is this line in the code (in the setup function):



    while (!Serial) { ; }


    The Teensy will hang forever waiting for the USB Serial to be connected. A better...
  42. This might be a case where you would need to post...

    This might be a case where you would need to post pictures of your setup to help people identify what the issue might be.
  43. Posts from Paul have indicated for the Teensy...

    Posts from Paul have indicated for the Teensy 4.0/4.1, it is generally better that the path between the Teensy and the audio board be as short as possible (i.e. don't use ribbon cable).

    As MartT...
  44. This is due to the Teensy using the same pins for...

    This is due to the Teensy using the same pins for Arduino UNO, which had the SPI clock pin (13) on the same pin as the LED. The first Serial port (pins 0/1) and the I2C bus (18/A4 and 19/A5) are...
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    Nope, I only run Linux. Under Linux, if you go...

    Nope, I only run Linux. Under Linux, if you go to the installation directory, it is in:

    ./hardware/teensy/avr/libraries/Audio/Audio.h
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    FWIW, the audio adapter uses I2C addresses...

    FWIW, the audio adapter uses I2C addresses 0x0A/10 (SGTL5000) and 0x1A/26 (WM8731).
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    The 3.x series has kept the pins the same for the...

    The 3.x series has kept the pins the same for the standard pins, but the Teensy 3.5/3.6 added some new features for pins 0..23. By standard pins I mean:

    Pins for the first 3 serial UARTs RX/TX...
  48. No. You have to use the Teensy loader to load...

    No. You have to use the Teensy loader to load the hex file.

    Be sure to check whether CP supports the Teensy 4.1 ethernet.
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    Well the simplest way is to use the Teensy 4.1...

    Well the simplest way is to use the Teensy 4.1 now that it is available, and it has those pins as part of the normal pinout..

    Last July, I added this page to the unofficial Teensy wiki on the...
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    I don't know anything about Sparkfun's plans, but...

    I don't know anything about Sparkfun's plans, but they generally do their new releases on Friday.
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