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    Please don't post duplicate threads. I answered...

    Please don't post duplicate threads. I answered your question over in the first post I saw (in the audio sub-forum).
  2. You should be able to as long as you don't use a...

    You should be able to as long as you don't use a device with either 0x0A (SGTL5000) or 0x1A (WM8731) addresses, since those are on the audio board. The audio board has pull-up resistors on it, so...
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    Yes, I was wondering the same thing of how you...

    Yes, I was wondering the same thing of how you connect the Teensy w/o soldering. I could understand different sized pogo pins for the outside pins compared to pins 24-33, but the pins for the SD...
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    Nice looking board. Hopefully rev C will be out...

    Nice looking board. Hopefully rev C will be out shortly, as having pin #23 (LRCLK1) would be nice to have.
  5. Timings for different uncanny eyes

    This morning I decided to do timing runs for all of the uncanny eye variants I have setup. Note, these don't necessarily have the same options compiled it, and they are using somewhat different base...
  6. Would it be possible to list the actual products...

    Would it be possible to list the actual products for the ferrite beads, capacitors, and resistors? I'm not up on the numbering scheme used for surface mount components, and there are just so many...
  7. Teensy 4.0 audio shield roll out

    I was browsing all 3 electronics candy stores (Adafruit, Sparkfun, and Digikey). I noticed that the Teensy 4.0 version of the Audio Shield hasn't made it to Adafruit or Sparkfun yet (Digikey gets...
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    Interesting shields, though I probably would...

    Interesting shields, though I probably would prefer one shield with all 3 options.

    I go back and forth as to how to provide battery charging to the Teensy. In the past I've used onehorse's. My...
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    It might be simpler to use the Rasberry Pi 2x20...

    It might be simpler to use the Rasberry Pi 2x20 IDC cable. That is all through hole (0.1" or 2.54mm) spacing, and there are cheap cables, shrouded headers, etc. Though of course there might be an...
  10. I was doing some runs of uncanny eyes this...

    I was doing some runs of uncanny eyes this morning on a Teensy 4.0 using the 240x240 Adafruit displays, one on SPI0 using the default 10 CS pin, and the second display on SPI1 using the default 0 pin...
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    Hacker's shield

    One thing that I often try to do in my customized prototype boards is to lay things out logically.

    Right now, with the Teensy 4.0 I could imagine having clusters of pins that you can use...
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    Possible new shields

    Paul suggested posting shield suggestions here so it doesn't get lost in the future features & pinout thread:

    https://forum.pjrc.com/threads/57842-Future-Teensy-features-amp-pinout


    So I...
  13. Note, the OSH park link is (eliminate the '**'):...

    Note, the OSH park link is (eliminate the '**'):

    https://oshpark.com/shared_projects/CrfX6z5v
  14. Audio shield flash memory (SOIC-8)

    I was thinking of tricking out my Teensy 4.0, and adding flash memory to the audio shield. I also would be adding standalone flash if I'm not using the shield.

    In the past, I would use the prop...
  15. This thread asked for better documentation of...

    This thread asked for better documentation of PWM:

    https://forum.pjrc.com/threads/57927-Doc-update-request-to-cover-Teensy4-0-for-Pulsed-Output-PWM-amp-Tone?p=218268#post218268
  16. If the issue is 16-bits, using float will help a...

    If the issue is 16-bits, using float will help a little, but you've just moved the goal post out just a little. Float has 23 bits of precision for the mantissa, plus the hidden bit. So you can...
  17. That error is due to the Teensy 4.0's memory is...

    That error is due to the Teensy 4.0's memory is sub-divided into regions, and you can only put less that 512K into the code/const region. Unfortunately this is a limitation of the NXP 1062 that is...
  18. For me. the wrong pins were brought out in the...

    For me. the wrong pins were brought out in the shield I got (pins 30, 31), so I never used the pogo pins for the underneath 10 pads. I did use them for the on/off button and they seemed to work, but...
  19. The reason for the end cuts is to bring out the...

    The reason for the end cuts is to bring out the three buttons from the end row to the side pins:

    on/off
    program
    Vbat


    Now, if you are doing your own PCB, you could just as easily have...
  20. Obviously it depends on how much you used...

    Obviously it depends on how much you used floating point, and whether your floating point was adds/subtracts, or whether it had a lot of divisions, calls to trig functions, etc.

    For the record:
    ...
  21. I am poor in soldering, and just wrecked a purple...

    I am poor in soldering, and just wrecked a purple Teensy 4.0 trying to cut the VUSB->VIN trace (fortunately, I had ordered another purple Teensy and I have a green one also) before attaching the...
  22. Is there a third Teensy 4.0 breakout board?

    I've been following the process of the loglow breakout board:

    https://forum.pjrc.com/threads/57122-Teensy-4-0-Breakout-Kit


    And the second PCB designed by blackketter:

    ...
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    My boards came with the second version of the...

    My boards came with the second version of the layout (0.14" depth), and I'm puzzling out how to set up my Teensy.

    Normally I use large female stacking headers cut down to size:

    ...
  24. Yes it works. I thought the I2S objects were...

    Yes it works. I thought the I2S objects were always stereo, and they are just mono streams (with some inputs producing two mono streams, and some outputs taking two mono streams).
  25. Good to know. Thanks.

    Good to know. Thanks.
  26. Thanks. I guess I didn't notice the two separate...

    Thanks. I guess I didn't notice the two separate inputs on i2s1. I'll try it out tonight when I get back into hacking Teensys.
  27. Cheap stereo speakers for prop use?

    I tend to want to use teensy in costume props, and sometimes I want to add sound support. This means small, lightweight, and can run on a single USB battery that also powers the Teensy and people...
  28. Is there a way to isolate/swap/boost just the left or right channel?

    I was wanting to test a setup with stereo speakers. I wanted to use the mono ToneSweep, but instead direct to each speaker (i.e. do a run with ToneSweep on the left channel and then do a run on the...
  29. Library documentation (particularly for Teensy 4.0)

    As I answer questions about the library, I notice some of the library pages have not been updated for Teensy 4.0. A meta question is whether it is time to make a separate Teensy 1.0/2.0/2.0++...
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    On Teensy 3.2, 3.5, and 3.6 there is support for...

    On Teensy 3.2, 3.5, and 3.6 there is support for setting pins for transmit enable, RTS, and CTS. Once you set these pins, the Serial code does the flow control for you. While you can use any pin...
  31. Note, I haven't done it yet, but I suspect that...

    Note, I haven't done it yet, but I suspect that there isn't room to solder a micro SD card directly to the Teensy. There are 2 or 3 bumps in the back of the Teensy that looks like they would be...
  32. You might be seeing 'Contact Bounce' or chatter:...

    You might be seeing 'Contact Bounce' or chatter:

    https://en.wikipedia.org/wiki/Switch#Contact_bounce
    https://www.youtube.com/watch?v=jYOYgU2vlSE


    There are various hardware solutions, but...
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    Talking about SPI, I noticed the SPI page needs...

    Talking about SPI, I noticed the SPI page needs to be updated for Teensy 4.0:

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


    I don't know if spi4teensy3 is still usefu fpr Teensy 3.x (this is...
  34. Yes, you have the audio shield designed for the...

    Yes, you have the audio shield designed for the Teensy 3.2, 3.5, and 3.6. There is a new version of the Audio Shield (revision D) that expects the pin layout of the Teensy 4.0. The PJRC page now...
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    Sure, I'm sure it is designed for things like...

    Sure, I'm sure it is designed for things like that. But the Arduino infrastructure does not really seem like it would support dual cores, particularly dual cores with different processors. In the...
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    I wonder what the M4 is for, and whether it would...

    I wonder what the M4 is for, and whether it would have things lost in the M7 (touch pins, DACs, differential analog inputs, etc.). Now in hosted situations, I could imagine the M4 being used to...
  37. I've used the MCP23017 on a Teensy 4.0. It works...

    I've used the MCP23017 on a Teensy 4.0. It works fine, providing:

    You use 3.3v for the VIN on the MC23017. It can be harmed with 5v input from the I2C device. If you must deal with 5v devices...
  38. Note, pin 11 is MOSI, and pin 12 is MISO by...

    Note, pin 11 is MOSI, and pin 12 is MISO by default.

    PJRC just released a revision D of the Audio Shield that works with the Teensy 4.0 (but not the T3.6 without using jumper wires). On the...
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    If you could add labeling for the pins on the...

    If you could add labeling for the pins on the underneath side, it would be very helpful.

    Also, I was noticing that pins 24-33 don't seem to be laid out logically.
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    What size/type capacitors are people using for...

    What size/type capacitors are people using for the USB host and SD cards? Are there other protections that we should be thinking about? Do we need diodes in the USB to prevent reverse current...
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    If there are favorite sites that discuss things...

    If there are favorite sites that discuss things like flux, etc. it might be helpful for those of us whose knowledge ends with which part of the of the soldering iron to hold. :-)
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    Of course if we are really blue skying things, it...

    Of course if we are really blue skying things, it would be nice if there were pads underneath the PCB to solder surface mount pull-up resistors for the things that generally need them (i.e. I2C...
  43. Perhaps there is no advanced support for MQS, but...

    Perhaps there is no advanced support for MQS, but I have been playing small Halloween WAV files that I converted via WAV2SKETCH and downloaded in memory with it this morning, connecting it to an...
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    Mine arrived today. Man those 1mm holes look...

    Mine arrived today. Man those 1mm holes look small.
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    I would hope the current 23 pins on the Teensy...

    I would hope the current 23 pins on the Teensy 4.0 will be the same as the 4.1. I'm sure you don't want to design and stock yet another audio shield variant. Even if they are in a different...
  46. Here is a simple program that I wrote to use MQS...

    Here is a simple program that I wrote to use MQS using the Audio library.

    ...
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    If you are just putting the signal to an...

    If you are just putting the signal to an amplifier that feeds a speaker, then some possible solutions might include:

    Use the MQS output. These use pins 10 and 12, which precludes using the main...
  48. Well the Teensy 4.0 does not come with a SD card...

    Well the Teensy 4.0 does not come with a SD card soldered on to it. You have to do the soldering. On the beta units, Paul's breakout board for the Teensy 3.x audio shield brought out both SD card...
  49. I'm not Paul, but I suspect it has to do with the...

    I'm not Paul, but I suspect it has to do with the underlying bits of the M4 (Teensy 3.x) vs. M7 (Teensy 4.0). I.e. any particular pin can only have so many settings, and NXP may have changed things...
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    Gamedunio 3 has a 4.3" 480x272 display and the 3x...

    Gamedunio 3 has a 4.3" 480x272 display and the 3x has a 7" 800x480 display.

    Recently the author has put out a new release that specifically mentions running on the Teensy 4.0.

    The Gamedunio...
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