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  1. Is there a chip that combines both a single channel MOSI tri-state & CS pull-up?

    According to the SPI guide:

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


    Two hardware related issues are:

    Add pull-up resistors for the CS pin (and D/C pin if used);
    Make...
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    Hmmm, I never got a PM nor did I get emails. I...

    Hmmm, I never got a PM nor did I get emails. I did PM you with the address.
  3. Yes. For each of the two audio boards, you...

    Yes. For each of the two audio boards, you should not use the pins used by that audio board for anything else, with these exceptions:

    You can use the I2C pins (18/19) to connect to other I2C...
  4. Yes, the digital pins (0 - 23) are the same, as...

    Yes, the digital pins (0 - 23) are the same, as are the analog pins (14 - 23). The primary I2C pins (18 - 19) are the same. The pins for the first UART (0 - 1) are the same. If you don't use the...
  5. Ummm, I suspect you are going to need completely...

    Ummm, I suspect you are going to need completely separate boards between the Teensy 3.2 and Teensy 4.0, unless you can only use the pins not used by either 3.2 or 4.0. Differences include:

    The...
  6. Ummm, the syntax: void onClock() { if...

    Ummm, the syntax:


    void onClock() {
    if (ClockCount<=3){
    digitalWrite(ledPin, HIGH);
    }else{
    digitalWrite(ledPin, LOW);
    }
    ++ClockCount = ClockCount%24;
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    I wasn't part of the first round of beta testers,...

    I wasn't part of the first round of beta testers, but I would like to be added to the current round if you have room. Let me know what specific parts I would need to order (presumably from digi-key).
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    It sort of depends on what you want to do. The...

    It sort of depends on what you want to do. The most typical way is to use digital I2S and let the I2S device generate the sound. And for the Teensy 4.0, the main method it to get the version D...
  9. The ISO C/C++ standards say that in an arithmetic...

    The ISO C/C++ standards say that in an arithmetic expression, 'short' and 'char'' values are promoted to 'int' (*) and then the normal rules of arithmetic promotion is done (i.e. if in a binary...
  10. I had forgotten about this thread, until I found...

    I had forgotten about this thread, until I found it searching for something else.

    I did buy the flash memory and the Sparkfun adapters. I was able to solder one flash memory to the Sparcfun...
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    Note, if you are using a prop shield, you would...

    Note, if you are using a prop shield, you would need to set pin 5 HIGH in order for the prop shield's amplifier to work with a speaker connected to the -/+ pins at the front of the prop sheet board. ...
  12. Phillip Burgess is the main author of it. In...

    Phillip Burgess is the main author of it.

    In July 2018, he started adding support for the Adafruit M0 and M4 systems at the time for the two 128x128 displays (OLED and TFT). According to the...
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    If you buy the raw MCP23017 chips, probably not. ...

    If you buy the raw MCP23017 chips, probably not. If you buy them packaged up with a PCB, perhaps they will include the pull-up resistors, and perhaps not. If they include pull-up resistors, it...
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    Note, I2C devices on the Teensy may require...

    Note, I2C devices on the Teensy may require pull-up resistors. If any of your I2C devices have pull-up resistors, you don't need to add others. If none of them have pull-up resistors, you will need...
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    Lets see if I can clear it up. In the Teensy 3.2...

    Lets see if I can clear it up. In the Teensy 3.2 time frame Paul used DOUT/DIN/SCK compared to MOSI/MISO/SCK used in later processors.

    By default, on Teensy LC, 3.2, 3.5, 3.6, and 4.0:

    Pin...
  16. Sorry about that. It was your site that I picked...

    Sorry about that. It was your site that I picked it up from. So I assumed you had done the work, but yeah, now that I think on it, KurtE did do most of the work. After awhile it gets hard to track...
  17. The uncanny eyes program used a lot of Teensy 3.x...

    The uncanny eyes program used a lot of Teensy 3.x specific optimizations for display that are completely different for Teensy 4.0.

    Some time ago, mjs513 improved that program to support the...
  18. Adafruit has discontinued selling the PJRC prop shields

    I was looking at the adafruit forum, and somebody wanted to make a light saber and had found one of the guides using the Teensy 3.2 and prop shield to build it. But he went to the Adafruit page for...
  19. No, these are pins for driving a micro SD card...

    No, these are pins for driving a micro SD card reader in quad SPI mode.



    That is right, the Teensy 4.0 has no DACs. For audio, you could use the two MQS pins (pins 10 and 12), but you lose the...
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    By not accurate, I mean that the PCB has markings...

    By not accurate, I mean that the PCB has markings for the 3.6 (i.e. ground, ground, D+, D-, 5v). It does not have markings for the 3.5 (i.e. you just have to know that the 2 pins are A25 and A26,...
  21. See this thread: ...

    See this thread:

    https://forum.pjrc.com/threads/58028-Pins-to-bring-out-on-a-hypothetical-larger-Teensy4


    There are two main boards being discussed. One is a board that uses a processor in...
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    With the Teensy with the USB adapter pointing to...

    With the Teensy with the USB adapter pointing to the left, on the bottom 5 inner pins (between the outer pins 1-7):

    On the Teensy 3.6, these 5 pins are for the USB host support (a second USB where...
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    Off hand, I didn't notice any larger ILI9341...

    Off hand, I didn't notice any larger ILI9341 240x320 displays at Amazon.com. There is a 3.2" display, but that likely is not a big enough jump.

    There are various ways to get a bigger screen, but...
  24. I thought I had done a post, but it turns out...

    I thought I had done a post, but it turns out that was for the Audio board for the 3.x series. Here is the information for the 4.0:

    The following pins are common pins, used by both the audio...
  25. Don't assume random parts from your parts bin will work

    I was messing around, and I had some DFPlayer Minis lying around. These are rather simple MP3 players that play MP3 files from a micro SD card. You can control it via a serial line or via simple...
  26. Or alternatively, use NiMH AA rechargeable...

    Or alternatively, use NiMH AA rechargeable batteries. These batteries have a nominal voltage of 1.2 volts (4.8 volts for 4). I believe freshly charged they might be 1.38 volts (5.52 volts for 4). ...
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    As I understand it, S/PDIF support is not in the...

    As I understand it, S/PDIF support is not in the current 1.48 for Teensy 4 (it is in Teensy 3.x).

    Note, when posting code, please put it inside the CODE and /CODE tags. Use the '#' on the tool...
  28. Yes, pin 13 is not an analog pin.

    Yes, pin 13 is not an analog pin.
  29. There is this post that mentions some things to...

    There is this post that mentions some things to improve SPI devices:

    https://www.pjrc.com/better-spi-bus-design-in-3-steps/
  30. It probably would be helpful to post a picture...

    It probably would be helpful to post a picture showing exactly how you have things wired up.
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    Unfortunately, Paul has said that was a design...

    Unfortunately, Paul has said that was a design choice due to wanting to run at USB 2.0/HI speed (480 Mbps) instead of USB 1.2/Full speed (12 Mbps) that the previous Teensys ran at. Evidently there...
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    I must admit that as we've had multiple threads...

    I must admit that as we've had multiple threads about various castlelated pins and board extensions, it would be nice if there was an easier method for getting to the underneath pads with breakout...
  33. Cool thanks. My previous set came back from OSH...

    Cool thanks. My previous set came back from OSH park and the castlelated part for pins24-33 was not cut out. There were normal holes there, so I figured I could just put chunk of solder in the hole...
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    Some general notes. Yes, eventually you are...

    Some general notes.

    Yes, eventually you are going to possibly want 70 buttons, but you are going to want to start small rather than trying to add code to add all 70 buttons at once. And you will...
  35. Note if you are using I2S output on the Teensy...

    Note if you are using I2S output on the Teensy 3.2, 3.5, or 3.6, two of the I2S pins are the default SPI0 pins, so you would need to use the alternate pins for these. Look at the audio shield...
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    I am a software guy, so this is more of a guess...

    I am a software guy, so this is more of a guess than anything else. I suspect that you probably want to have a battery in between the raw hydro power and the Teensy. The hydro power would recharge...
  37. No problem. just having 1 or 2 holes on the left...

    No problem. just having 1 or 2 holes on the left side would probably help.
  38. Just to be clear: The following pins are...

    Just to be clear:

    The following pins are common pins, used by both the audio board and available for other uses:

    Vin (I'm not sure if the audio shield uses this or not)
    Analog Ground (used...
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    The on/off switch is not really a reset switch. ...

    The on/off switch is not really a reset switch. A real reset switch will instantly restart the processor once you connect it to ground.

    On the Teensy 4.0, if you connect the on/off pin to ground...
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    Other than designing a board to connect this...

    Other than designing a board to connect this board to the Teensy (and of course ultimately soldering stuff and a micro SD card), you don't need any additional components. The board has all of the...
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    I'm not sure what you meant by the relocation of...

    I'm not sure what you meant by the relocation of RX2, but given the PT8211 board uses I2S, there are several pins that need to be relocated with jumper wires. I posted a list some time ago, but I...
  42. @FRDM4236 I'm finally getting around to soldering...

    @FRDM4236 I'm finally getting around to soldering the board you sent me, and I'm also looking at the V3 board currently being produced at OSH park (+ purple Teensy 4.0) that I ordered on October...
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    Teensy to HDMI output

    In going through my mail (from the gamedunio3 developer looking at doing HDMI output), and following some google links, I noticed there is an Arduino -> HDMI board out there, that has an optional...
  44. We probably need to come up with an alternate...

    We probably need to come up with an alternate name for PROGMEM for functions, and get it into 1.49, and change all the function declarations in the current source to use this new name.

    Given how...
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    An alternative spreadsheet is my spreadsheet...

    An alternative spreadsheet is my spreadsheet where I attempt to keep track of the Teensy LC, 3.0, 3.1, 3.2, 3.5, 3.6, and 4.0 pin assignments:

    ...
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    Well, Adafruit finally has the audio shield for...

    Well, Adafruit finally has the audio shield for Teensy 4.0 available as a separate part number from the version for 3.x.

    Sparkfun has not yet changed their web page to indicate the audio shield...
  47. In terms of your connections, there are several...

    In terms of your connections, there are several things that need to be changed:

    1) You connected VIN to the power terminal -- on the Teensy, except when you are powering external devices that need...
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    Would it be possible to have pin #'s on the...

    Would it be possible to have pin #'s on the bottom silk screen? At least for the pins > 23? I really don't want to have to refer to an online site when I'm bringing out pins.
  49. Originally i2c_t3 was the only way to do multiple...

    Originally i2c_t3 was the only way to do multiple I2C buses, but Paul did add support in Wire.h some time ago for multiple I2C buses.

    It is unfortunate that there is currently no Teensy 4 version...
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    Gamedunio3 and Gamedunio3x are other options that...

    Gamedunio3 and Gamedunio3x are other options that have the separate microprocessor on the display, and you communicate over SPI (nextion uses a serial port)

    ...
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