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  1. I should mention a simpler approach is to use...

    I should mention a simpler approach is to use something like the dfplayer that has a SD card and can emit audio directly. There you only send it commands from the Teensy, and you don't have to have...
  2. I had done it in the days when I was using the...

    I had done it in the days when I was using the Teensy 3.2/3.5/3.6 on the 128x128 TFT displays (in 2018) with the prop shield using the built-in DAC for the sound and encoding the sounds as RAW files...
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    If you just wanted the value as a sequence of...

    If you just wanted the value as a sequence of bits, the C/C++ method is to do shifting and masking. There are two ways to number the bits. The first method is big endian where bit #0 is the sign...
  4. Out of curiosity is it sound related (i.e. the...

    Out of curiosity is it sound related (i.e. the Teensy 4.x don't have DACs so you can't just plug in a speaker + amp to A14 and get sounds out). Or is there something else? I'm not sure what DOF is...
  5. Check out the Octows2811 library page...

    Check out the Octows2811 library page (https://www.pjrc.com/teensy/td_libs_OctoWS2811.html). It says on the Teensy 4.0 and 4.1 you can use any digital pins.

    In particular look up File > Examples...
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    In the Tools drop down menu, select USB TYPE, and...

    In the Tools drop down menu, select USB TYPE, and within that drop down menu select Serial + MTP Disk (Experimental). You need Teensydunio 1.57 for this. In earlier Teensydunio's, you could only...
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    MTP_Teensy can be found at...

    MTP_Teensy can be found at https://github.com/KurtE/MTP_Teensy
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    I believe the official PJRC version is only...

    I believe the official PJRC version is only compatible with Teensies. You might get a better answer asking in forums where people deal with the pico pi more often. I've heard that people had...
  9. IIRC, not all pins have interrupt capability on...

    IIRC, not all pins have interrupt capability on the LC. Let's see, from the back of the LC card, pins 0, 1, 16/A2, 17/A3,18/A4, 19/A5, 24/A10, 25/A11 and 26/AC12 aren't listed as having interrupts.
  10. Private message sent.

    Private message sent.
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    IIRC, the audio adapter already includes pull-up...

    IIRC, the audio adapter already includes pull-up resistors for pins 6 and 10. But random other SPI boards don't include pull-up resistors.
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    Nothing is hooked up to either SPI bus until you...

    Nothing is hooked up to either SPI bus until you connect something. If you connect the audio shield with the default pins, there would be two SPI devices (audio shield and flash memory on the audio...
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    The SPI is a shared bus, so you can have other...

    The SPI is a shared bus, so you can have other devices on the bus. Each device must have at least one CS pin that tells the device that the SPI packets are meant for it. There are a few devices...
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    Be careful with TFT displays in cars. I find in...

    Be careful with TFT displays in cars. I find in terms of using camera displays (both rear monitor and electronic viewfinder) that often times TFT displays have one orientation that is problematical...
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    In general, it depends. If you only use the...

    In general, it depends.

    If you only use the basic devices (first I2C bus, first Serial port, first SPI bus, 10 analog input pins, pins 0..23 as digitial pins) then it should work fine.

    If you...
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    It really depends on how powerful the LEDs are. ...

    It really depends on how powerful the LEDs are. For just 2 LEDs that don't have to be excessively bright, you are likely over-thinking things. The simplest thing is to get two LEDs with resistors...
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    Note, if you do that you may/may not have some...

    Note, if you do that you may/may not have some issues. The Adafruit Neopixel Uberguide Best Practices covers a lot of cases. The guide is perhaps getting a little old, but it pulls together some of...
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    It depends on the LEDs. If the LED can be driven...

    It depends on the LEDs. If the LED can be driven by 3.3v power and it includes a resistor to regulate the power to the LED, then you can hook up the LED directly (LED plus to a data pin, LED minus...
  19. Yep. I can confirm that. The M2 screws I bought...

    Yep. I can confirm that. The M2 screws I bought from the hardware store fit fine. But I will need to look around for much smaller M2 screws (h/w store only had 12m long screws, and I want...
  20. Well I can imagine that for larger screens,...

    Well I can imagine that for larger screens, particularly where the screen actually has more pixels. Something has to interpolate the image at one resolution to display it at another (and at times,...
  21. Speaking of uncanny eyes, has anybody tried...

    Speaking of uncanny eyes, has anybody tried uncannyEyes_async_st7789_240x240.ino recently? Now that I have the GC9A01A_t3n display running, I decided to bring my old Teensy 4.0 that was setup to use...
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    Yes. The uint_t and int_t cannot...

    Yes.

    The uint<size>_t and int<size>_t cannot be used with the scanf and printf % formats. The scanf/printf formats can only handle standard types. The <size> types are mapped into the...
  23. In particular, with regard to just the SD drive...

    In particular, with regard to just the SD drive and flash memory if you've soldered it on, the 3.x Teensys needed to use the alternate SPI ports because the I2S ports for the audio stuff overlapped...
  24. In terms of the clear display, I don't have one. ...

    In terms of the clear display, I don't have one. And the mono OLED is fairly small.

    FWIW, I've been playing with adjusting the defaults.

    I disabled the right eye (so I could check the results...
  25. The special CS and D/C pins used to optimize the...

    The special CS and D/C pins used to optimize the SPI touch screen on the Teensy 3.x processors don't have the same optimization on the Teensy 4.x. The display should still work, it just might be...
  26. Hmmmm, yeah that might get freaky. Plus I assume...

    Hmmmm, yeah that might get freaky. Plus I assume it would get quickly into feature overload mode. I would imagine with a PI, you might be able to take input from the camera, and clip it to the...
  27. It depends on what you are doing. If you only...

    It depends on what you are doing. If you only use the first serial port, use SPI port without using the alternate pins, normal I2C, don't use the DAC (A14) don't use the inner analog pins (AREF,...
  28. FWIW, the capability I've thought was really cool...

    FWIW, the capability I've thought was really cool was on the Monster M4SK, which is a pair of 240x240 displays.

    When I plug in the M4SK, it provides the flash as a removable disk as well as doing...
  29. Ok, I mis-read the #ifdefs and for the second...

    Ok, I mis-read the #ifdefs and for the second (right) eye, I was using the Teensy 3.5/3.6 defaults instead of the Teensy 4.1 defaults. I suspected that was probably the case
  30. Mine was from Waveshare, which makes many of...

    Mine was from Waveshare, which makes many of these displays. But I would imagine over time there will be other clones made of the display.



    Yeah, mine seemed to want to always flop down on to...
  31. Yep, as I thought I had the wiring wrong (I...

    Yep, as I thought I had the wiring wrong (I believe I forgot to add an extra pin to account for the ground pin). I got the first eye doing the graphicstest, and one or two of the other demos. Then...
  32. I got my GC9A01A's in the mail. But they don't...

    I got my GC9A01A's in the mail. But they don't work with uncanny Eyes. I'll look at them tomorrow after work (probably wiring issue, and I mis-counted the pins). Should the backlight be attached...
  33. Cool. Thanks. Mine should be here on Tuesday...

    Cool. Thanks. Mine should be here on Tuesday (Monday is a USA holiday). One issue with the traditional two displays was hiding the extra bulk of the corners of the display if you were thinking...
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    To be sure, for I2C you need a bi-directional...

    To be sure, for I2C you need a bi-directional voltage translator to handle I2C. I.e. you have to boost the signals from the Teensy from 3.3v to 5v, and you need to lower the signal from the I2C...
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    Here is the paper that describes tri-stating (as...

    Here is the paper that describes tri-stating (as well as using pull-up resistors on the CS pins, and making sure your libraries use transactions):


    ...
  36. It's been awhile since I played with ST7789...

    It's been awhile since I played with ST7789 displays. Refresh my memory which pins should be used for the CS and D/C pins on the Teensy 4.0/4.1 for fastest frame rate.

    From the pinout card, it...
  37. I hadn't noticed that, but given the parts...

    I hadn't noticed that, but given the parts shortage, I can imagine offering a version without the ethernet phy.

    And if your SMT soldering skills are rusty or non-existant, you can get pre-soldered...
  38. I put an order for 2x of the displays.

    I put an order for 2x of the displays.
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    Be sure to check underneath the Teensy, as...

    Be sure to check underneath the Teensy, as several of the Teensies have protrusions on the bottom. Some of the PCB boards that I've seen that were meant to be soldered directly tended to have...
  40. Good work. I've wondering about these displays,...

    Good work. I've wondering about these displays, and of course whether I could adapt the uncanny eyes code. In theory, I imagine it should just 'work' providing the eye drawn is within the circle of...
  41. There are voltage level converters that can...

    There are voltage level converters that can handle bi-directional conversion issues for I2C (RX/TX are unidirectional, so they should work ok with just about any logic level shifter). These are...
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    You can also use the micro SD card solder pads...

    You can also use the micro SD card solder pads underneath the Teensy 4.0. Back before the Teensy 4.1 came out, various people were soldering flexible cables to attach the SD card reader, and there...
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    Others can give you more detailed information...

    Others can give you more detailed information about this.



    In almost all of the time, this is caused by code that waits for the Serial USB line to be initialized. Given you are being run off...
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    I'm not Paul, but I suspect it won't go into the...

    I'm not Paul, but I suspect it won't go into the Teensy proper, as it likely will raise the costs that relatively few people would use.

    I've seen various USB C-PD trigger cables that when plugged...
  45. It depends. Most can be. However, if the...

    It depends. Most can be.

    However, if the sketch uses #ifdef ARDUINO_TEENSY40, it will have to be adjusted to #ifdef ARDUINO_TEENSY41 (or maybe use #ifdef __IMXRT1062__, which covers both).

    If...
  46. Here one of the threads about the work in...

    Here one of the threads about the work in progress for exporting things like SD cards and flash memory file systems. Unfortunately, it still might take some work to get it to work with the prop...
  47. There is work going on, but I haven't kept track...

    There is work going on, but I haven't kept track of it. I think two of the repositories are here, but it would be helpful if the people working on it could post a link to a howto:


    ...
  48. There is work in progress to make the various...

    There is work in progress to make the various flash memories available as a USB removable drive. Unfortunately, I haven't had time to keep up with it. Maybe somebody else can chime in with the...
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    Just to be clear, the issue is using the SPI...

    Just to be clear, the issue is using the SPI devices with MQSR/MQSL and with the neopixel level shifters. If you don't use either the flash memory on the propshield or use an external SPI display,...
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    Many years ago, I did experiment with the...

    Many years ago, I did experiment with the propshield, neopixels, and SPI displays. I needed to use code to switch the pins from SPI mode to normal mode. KurtE suggested the code that I applied in...
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