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    It may be useful to add a list to the beta/final...

    It may be useful to add a list to the beta/final announcement of libraries/functionality that still does not have Teensy 4.0 support, just to gather the information where the announcement is.

    Of...
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    The preprocessor is just a textual substitution. ...

    The preprocessor is just a textual substitution. When it sees 'DELAY_VALUE' it will substitute '(500/DELAY_ITERATIONS)' which in turn causes DELAY_ITERATIONS to be expanded. The expansion would be...
  3. There are also breakout boards you can have made...

    There are also breakout boards you can have made at a fab like OSH park, that allow you to solder connections and bring out the ports either to normal 0.1" pins or to a micro SD card. Recently there...
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    Off hand, I would probably suggest going with the...

    Off hand, I would probably suggest going with the M0 version instead. The one you mentioned uses an older 8 bit processor (AVR 32u4, similar to the ones used in the Arduino Leonardo boards or the...
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    It sort of depends on what you really want/need,...

    It sort of depends on what you really want/need, your programming skills, etc. Note, while I know these products exist, I might not have actually used them.

    If you are just wanting wireless...
  6. Another obvious question. The Teensy needs...

    Another obvious question. The Teensy needs pull-up resistors on each of the i2c buses. Do you have pull-up resistors on the 2nd I2C pins? These are resistors that connect the SDA and SCL pins in...
  7. According to the pinout chart, there are no...

    According to the pinout chart, there are no alternate I2C pins, but there are 3 I2C buses on the Teensy 4.0:


    Wire: Pin 19/A5 is SCL0, pin 18/A4 is SDA0;
    Wire1: Pin 16/A2 is SCL1, pin 17/A3...
  8. Note, if you need flexibility but don't need the...

    Note, if you need flexibility but don't need the speed, perhaps the best solution is to work with the Circuit Python folks on the Teensy 4 fork. Then you should be able to install new python scripts...
  9. I did suggest it over at the Adafruit forum, but...

    I did suggest it over at the Adafruit forum, but I didn't hear anything. I didn't really expect to hear anything, since Adafruit has many different boards that the build themselves (feathers,...
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    If you look on the pinout card that came with...

    If you look on the pinout card that came with your Teensy LC, 3.x, or 4.0, you will see on the back of the pinout card:


    Cut to separate VIN from VUSB if using battery or external power

    That...
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    Well 1 insertion after the board is debugged. I...

    Well 1 insertion after the board is debugged. I have to imagine during bring-up there might be multiple insertions.
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    No. The PropShield has analog audio output using...

    No. The PropShield has analog audio output using the Teensy 3.2's DAC (digital -> analog converter, A14) pin. The Teensy 4.0 does not have a DAC pin. The audio support in the Teensy 4.0 is all...
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    Looking at the code, it does not have Teensy 4...

    Looking at the code, it does not have Teensy 4 support. The way you get the temperature is different between Teensy 3.x and Teensy 4.0.
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    That makes sense (likely all of the external...

    That makes sense (likely all of the external access stuff is in one area of the chip), though of course it opens up the issue if both the M7 and M4 want to try and access the same port at the same...
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    Providing you aren't trying to use a SPI device...

    Providing you aren't trying to use a SPI device (which also wants to use pins 11 and 13), you could use a LC prop shield, but that is rather expensive compared to a 74AHCT125.
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    Yes, fun times ahead. Even if we put it in a...

    Yes, fun times ahead. Even if we put it in a library, we are going to have to write the library. So while ordinary Arduino users might not start doing stuff with it now, we will need some way to...
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    Generally they are called FFC (or flexible flat...

    Generally they are called FFC (or flexible flat cable):

    https://en.wikipedia.org/wiki/Flexible_flat_cable


    If you do a google search for "nintendo switch ffc cable" there are various entries...
  18. Thanks, I'll look into when I get home. Note,...

    Thanks, I'll look into when I get home.

    Note, this is in a costume prop where I can't see the microprocessor normally. I had put the button on the top, and because of the current timeout without...
  19. I just tried it, and it works great. Thanks. ...

    I just tried it, and it works great. Thanks.

    Though now that it is much faster acting, I will have to better protect the button, so it doesn't get pressed by accident. Right now, I just have the...
  20. No, I will. Good idea. No, I will, thanks...

    No, I will. Good idea.


    No, I will, thanks for reminding me.
  21. Teensy 4.0 breakout with Feather Adapter

    At times I like to use Adafruit Feather wings and I use the Adafruit Teensy 3.2 -> Feather adapter:

    https://www.adafruit.com/product/3200


    And for portable projects like my wooden bowtie...
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    It really depends on several things. If you...

    It really depends on several things.

    If you are always willing to plug in your regulator, even when programming, then just cut the VUSB->VIN solder joint.

    If you want the option to run off of...
  23. Welcome to my world of trying to figure out why...

    Welcome to my world of trying to figure out why complex modern hardware is not easy to benchmark. :confused:

    Note, I know nothing about ARM so I can't speculate on the particulars.

    Since the T4...
  24. I still haven't soldered the Loglow board yet,...

    I still haven't soldered the Loglow board yet, but the blackketter board with different heights for the SD pins seems easier to do. You have to take it slow and check for solder bridges, etc. I...
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    Please don't ask the same question in multiple...

    Please don't ask the same question in multiple PJRC forums.

    If you install Teensydunio 1.49, it has options for configuring a Teensy 4.0 with various MIDI options, just like it does for the Teensy...
  26. There is a breakout on tindie.com that does not...

    There is a breakout on tindie.com that does not require any soldering to break out all of the underneath solder pads. Unfortunately, I don't recall the person's name on this site. Also, the...
  27. Just to be clear, are you talking 100 mega-bits,...

    Just to be clear, are you talking 100 mega-bits, or 100 mega-bytes?. Normally flash memory uses mega-bits while SD cards use mega-bytes. That flash memory card you mentioned is 128 mega-bits, which...
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    I just got an Adafruit Airlift featherwing, and I...

    I just got an Adafruit Airlift featherwing, and I compiled the ScanNetworks example program. It compiles fine for the Teensy 3.6, but it gives the following error for Teensy 4.0. I have tried both...
  29. I took a very brief glance at it. You will need...

    I took a very brief glance at it. You will need to find somebody who is familiar with both the internals for serial ports in the Teensy 3.x and Teensy 4.x microprocessors. Unfortunately, most of...
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    And note, that in the Teensy 3.2, 3.5, and 3.6,...

    And note, that in the Teensy 3.2, 3.5, and 3.6, the I2S pins overlap with the SPI pins. This means if you want to hook up a display using SPI, on the 3.x systems, you have to use the alternate SPI...
  31. It may not be the best quality, but I like the...

    It may not be the best quality, but I like the little Stemma speakers with built-in amplifiers that Adafruit sells. I've used them directly on the Teensy 3.5/3.6 DACs. You can buy the little Stemma...
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    There are various displays that will work. It...

    There are various displays that will work. It depends on what you need in the display and whether it has to be exactly 4.3".

    Generally what you want is a SPI display where the display has a...
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    As I recall, the Due (and maybe Mega) were...

    As I recall, the Due (and maybe Mega) were 'unique' in that the I2C interface on the shield was Wire1 instead of Wire. So you see a lot of code that hardwires Wire to be Wire1 on the Due/Mega.
    ...
  34. Actually, Adafruit specifically says their Stemma...

    Actually, Adafruit specifically says their Stemma QT connectors are compatible with the Sparkfun Qwiic connectors:

    https://learn.adafruit.com/introducing-adafruit-stemma-qt/what-is-stemma-qt
  35. Here are the slides that I presented, not much...

    Here are the slides that I presented, not much outside of what we've discussed, other than the last 2 pages (mention Arduino Portentia & long term Teensy 1170 based board and also mention things I...
  36. FWIW, I have used this board with the Teensy 4.0...

    FWIW, I have used this board with the Teensy 4.0 and at least one of the Teensy 3.x's:

    https://smile.amazon.com/gp/product/B07PS653CD/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
    Teensy...
  37. In terms of the servos, it might be simpler to...

    In terms of the servos, it might be simpler to move the majority of the servo processing off to a secondary board that handles the low level details of doing the pulse management, so it doesn't...
  38. I'm at a convention this weekend, but the way I...

    I'm at a convention this weekend, but the way I tend to want to use the feature is quicker on/off. I can understand why you want to have a timeout (to prevent accidental touching of the button), but...
  39. Yes, I could do that. At the moment, I needed it...

    Yes, I could do that. At the moment, I needed it for this weekend. Since I don't have to work with any random neopixel strip, I just switched the neopixels to use 3.3v and not VIN. While it is out...
  40. Yeah, human reaction times are fairly slow...

    Yeah, human reaction times are fairly slow compared to computer times, but if you decide to go for more buttons, then the problem scales up. :p

    Note however, if you do go for higher number of...
  41. One other thing, some of the Adafruit displays...

    One other thing, some of the Adafruit displays need pull-up resistors on the CS pins. I had a setup with 2 displays (the uncanny eye project at Adafruit), and I always had problems with corruption...
  42. In terms of optimization note that there are...

    In terms of optimization note that there are various speed levels for I2C, and it defaults to the slowest speed (100Khz), you might be able to boost it up to a higher speed, depending on the device...
  43. Assuming the switches are just on/off switches,...

    Assuming the switches are just on/off switches, one way be to use an i2c device like the MCP23017, such as Adafruit sells:

    https://www.adafruit.com/product/732


    You will likely need to add 2...
  44. Is there a hook to know when the on/off pin on the Teensy 4.0 has been grounded?

    I switched my little neopixel bowtie project to use a Teensy 4.0 (from Teensy LC). One of the things that prompted me to use the Teensy 4.0 was the on/off pin that can be used to turn off most of...
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    I was watching thjis weeks Ask an Engineer...

    I was watching thjis weeks Ask an Engineer (1/15/2020) from Adafruit, and they had a big mention about Circuit Python on the Teensy 4.0


    ...
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    Typically, instead of using SPI., you...

    Typically, instead of using SPI.<whatever>, you would use SPI1.<whatever> or SPI2.<whatever>.

    Now, whether the higher level libraries, support different SPI buses depends on the library.
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    I would worry about the state of the pin while...

    I would worry about the state of the pin while the chip is booting, before it gets to setup, but it shouldn't be hard to try.

    Here is a solution for the Teensy 3.2 to use a spare pin as a reset. ...
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    No, you want to connect the reset pin to ground...

    No, you want to connect the reset pin to ground to reset the board, not HIGH.
  49. What I meant is as I understand it, when you do a...

    What I meant is as I understand it, when you do a Serial<x>.print or Serial<x>.println, it copies all of the bytes to an internal buffer (each Serial UART + Serial USB has its own buffer). The first...
  50. I've seen a similar case before when I was...

    I've seen a similar case before when I was testing the T4 WS2812Serial library when it was first implemented for the T4. In my case, I was being lazy and using a 16 LED ring (from Adafruit) and...
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