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  1. The main thread where various displays are...

    The main thread where various displays are discussed, including ones you mentioned is at (I tried to jump to a page where they were discussing the 240x240 display (2nd one in your list):

    ...
  2. Gamedunio 1.2.1 now runs on Teensy 4

    I just got mail from James Bowman who created the Gamedunio 2/3/3X smart displays, and the new release (1.2.1) now runs on the Teensy 4.0:

    https://excamera.com/sphinx/gameduino2/code.html
    ...
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    Yep, I figured you would. But I what I meant,...

    Yep, I figured you would. But I what I meant, the Teensy 3.2 without soldered pins provided loose pins in the bag, but later Teensys don't.
  4. I haven't used any of these things, but a google...

    I haven't used any of these things, but a google search yielded:


    https://hackaday.com/2017/02/08/taking-the-leap-off-board-an-introduction-to-i2c-over-long-wires/
    ...
  5. As has been talked about, I'm sure there are...

    As has been talked about, I'm sure there are several solder challenged folk that would prefer a Teensy 4.0 follow on that is in a Teensy 3.5/3.6 form factor and includes the micro SD drive. I'm sure...
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    Well the T4.0 I got from Adafruit did not have...

    Well the T4.0 I got from Adafruit did not have pins. The PJRC version listed in their store no longer mentions providing pins, and I believe the purpose 3.2 I got from OSH park a year or two ago did...
  7. The latest status was posted in my purplse OSH...

    The latest status was posted in my purplse OSH teensy 4.0 thread:

    https://forum.pjrc.com/threads/57544-OSH-park-purple-Teensy-4-0?p=215183&viewfull=1#post215183
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    I haven't ordered from OSH park in over a year. ...

    I haven't ordered from OSH park in over a year. In the past, when I ordered PCBs, the shipping was free. Perhaps when a Teensy is added, or you don't order a PCB, they add the charge. Or perhaps...
  9. Yes, if you don't need audio output via the DAC,...

    Yes, if you don't need audio output via the DAC, you can leave the pins in the back of the prop shield unconnected (the prop shield only uses the DAC pin on the back row if memory serves). Note, the...
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    OSH park purple Teensy 4.0

    I was over at OSH park, and I noticed that the purple Teensy 3.2 (previously 3.1) was no longer for sale. But they now have the Teensy 4.0 for sale:


    ...
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    You can use Wire.h. An i2c bus is a shared...

    You can use Wire.h.

    An i2c bus is a shared bus. Each device has an address, sort of like a phone number. When the i2c master is talking to an i2c slave, it uses the address of the slave to send...
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    It sounds like you might have some accidental...

    It sounds like you might have some accidental solder bridges. Those can be hard to track down, particularly if they are bridges that are temporary depending on the pressure of the board.

    Just to...
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    I recall there was a Teensy based guitar shield...

    I recall there was a Teensy based guitar shield on tindie.com and looked it up:


    https://www.tindie.com/products/Blackaddr/arduino-teensy-guitar-audio-shield/?pt=ac_prod_search


    Even if you...
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    Well the display threads tends to have a lot of...

    Well the display threads tends to have a lot of talk about SPI in general and using both SPI0 and SPI1 to control two separate displays (most notably two of the cheap displays that don't have a CS...
  15. If you need optimized SPI with DMA, such as...

    If you need optimized SPI with DMA, such as running two displays, the posts I see from KurtE, mjs513, and defragster indicate that you should put each display on a separate SPI bus:


    SPI0: SCLK...
  16. On the Audio Shield it expects: Ground pin...

    On the Audio Shield it expects:

    Ground pin on left side
    Pin 6 on the audio shield (SPI Flash memory chip select), Pin 6 on the Teensy 4.0
    Pin 7 on the audio shield (SPI MOSI), Pin 11 on...
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    I believe so, though I have not done it...

    I believe so, though I have not done it personally. I believe the inner pins for USB host are in the same order as a USB adapter within computers.

    ...
  18. Yeah, my soldering iron doesn't have a thin tip. ...

    Yeah, my soldering iron doesn't have a thin tip. But yeah, the main problem I have is my computer/reading bi-focals the difference between the two lenses is about where I would want to use for...
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    As Blackaddr says, there are various ways to do...

    As Blackaddr says, there are various ways to do analog input.

    However, if your inputs are digital you can use the I2S pins. Unfortunately, the Teensy 3.x pinouts did not list the I2S pins. Note,...
  20. In order to optimize the displays on Teensy 3.x...

    In order to optimize the displays on Teensy 3.x systems, you will need to make sure both the CS pin and the D/C use the SPI0 fast pins. From the picture it looks like you are using pin 10 and pin 9...
  21. I was going to ask for suggestions of how to...

    I was going to ask for suggestions of how to better solder those pads. For the 3.2 I like the FrankB castellated board which is fairly easy to solder (and the Bob Larkin board for 3.5/3.6 in the...
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    FWIW, as I posted in another thread, I rendered...

    FWIW, as I posted in another thread, I rendered one of my T4's inoperable when I was trying to attach wires to the underneath pads. I'm pretty sure the problem was I extended pad #31 a little too...
  23. FrankB developed a MP3 library a few years ago,...

    FrankB developed a MP3 library a few years ago, and added a AAC player as well. However, it was developed in the Teensy 3.2 time frame, and only plays one MP3 file at a time.

    I see he made a few...
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    I don't use it, but if you want to program...

    I don't use it, but if you want to program multiple Teensys all on the same USB bus, you should be able to use this software:

    https://forum.pjrc.com/threads/27825-Teensy-Qt


    If you need to...
  25. Looks nice. It is probably more advanced than I...

    Looks nice. It is probably more advanced than I would use, but I can see other people using it who want to do more than just play some pre-recorded sounds. For me, the primary motivation is things...
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    Yeah, it likely is trying to use too much power. ...

    Yeah, it likely is trying to use too much power. If you have an ammeter, you could hook it up to see the power draw.

    I really like this voltage/ammeter because it has a bluetooth component, and I...
  27. FWIW, by cutting off all of wires soldered on to...

    FWIW, by cutting off all of wires soldered on to the bottom, and using solder wick to remove the solder, I was able to get it to boot again. In testing each of the solder pads in turn, it looks like...
  28. The issue is that since pin 13 has a LED attached...

    The issue is that since pin 13 has a LED attached to it, the LED includes a resistor, and that changes the electrical characteristics of the line when trying to read from it. Hence Paul's...
  29. Another day, another soldering failure

    I was trying to solder wires to the underneath of one of my Teensy 4.0's. I had gotten some 7 pads soldered, and I was going back for pads 27 and 31, when evidently I put on a little too much solder...
  30. Some simple things come to mind in terms of...

    Some simple things come to mind in terms of debugging it. Note, I am a software guy, not one who does a lot of processing with the audio shield (I tend to prefer the prop shield to play simple...
  31. It depends on whether the pins you want to use...

    It depends on whether the pins you want to use are not broken out by the interface. I believe pins 2, 7, 22/A8 and 23/A9 are not broken out by the feather adapter.
  32. I don't see any electrical components on the...

    I don't see any electrical components on the shield other than the 2 LEDs, so it should be safe. If it add additional components, you would need to verify that the components can all work at 3.3v.
    ...
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    Yes, I was responding to the user trixr. I...

    Yes, I was responding to the user trixr. I should have quoted part of the header, so it was obvious who I was talking to.

    But it looks like other users with the VL53LOX are chiming in.
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    At least in the past, the trouble with using the...

    At least in the past, the trouble with using the Rasberry Pi was the Raspberry Pi you would typically want to use (Raspberry Pi Zero or Raspberry Pi Zero W) from a size, cost, and power usage was...
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    In theory, #undef works fine, but any use of the...

    In theory, #undef works fine, but any use of the macro is in the .cpp file in the library or in inline functions/class definitions in the .h file, it won't see the changed value.
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    From your picture of the wiring, you do not have...

    From your picture of the wiring, you do not have pull-up resistors installed. Some devices provide pull-up resistors, so do not. So, try adding two pull-up resistors, one between pin 18/A4 (SDA)...
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    Pin 0 is also CS1, and Pin 1 is MISO1. Paul left...

    Pin 0 is also CS1, and Pin 1 is MISO1. Paul left these out of the original printing for the cards that came with the Teensy 4.0.
  38. I'm not sure what I'm looking at. It doesn't...

    I'm not sure what I'm looking at. It doesn't seem to be a board for the Teensy, as the holes are all wrong. And I can't tell where the I2S or SPI breakouts are (and S/PDIF is not yet supported). ...
  39. I posted a thread with similar questions, and I...

    I posted a thread with similar questions, and I did tests using both a mono I2S amplifier/speaker and using MQS output:

    ...
  40. ToneSweep for MQSL, no audio shield

    If you don't want to have I2S output, and don't use the main SPI bus, but want some basic output fed into an amplifier (such as the prop shield), here is the ToneSweep program rewritten to use...
  41. Have you programmed at least one sketch to your...

    Have you programmed at least one sketch to your T4? As shipped, Teensy's don't enable the USB serial port in their blink sketch. I was reminded of this when I took a new T4 out of the package, and...
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    FWIW, the Adafruit M4/M0 systems that export a...

    FWIW, the Adafruit M4/M0 systems that export a file system do so with a separate flash memory chip that is soldered onto the PCB of the microprocessor.
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    Obviously the big issue is supporting a...

    Obviously the big issue is supporting a filesystem from the Teensy, and others can answer that.

    But in terms of storage, there are various SPI and I2C flash memory systems floating around. The...
  44. ToneSweep for I2S mono amplifier

    To answer the question about using I2S amplifiers directly without the audio shield, it turns out to be pretty simple, as long as you use the default I2S TX (pin 7).

    Here is ToneSweep modified for...
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    It depends on how fast you need the conversion...

    It depends on how fast you need the conversion to. There are a bunch of level shifters that are made for i2c/spi/uart type conversions that will do the transfers in either direction. But they have...
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    I've damaged previous Teensys that weren't 5v...

    I've damaged previous Teensys that weren't 5v tolerant (Teensy 3.0, Teensy 3.6) with accidental 5v inputs. Usually the pin becomes unusable, but the rest of the Teensy limps along. I don't remember...
  47. Teensy 4.0 I2S without Audio Shield and flash memory question

    I've been thinking of soldering up a prototype board for Teensy 4.0 that brings out 2 of the three SPI buses (for uncanny eyes) and also brings out sound. Now, generally I do these one-off boards...
  48. For single integer values, you should not be...

    For single integer values, you should not be using 'PROGMEM' at all. Just use 'const'.

    Going back in history, 'PROGMEM' comes from microprocessors like the Arduino 8-bit AVR processors (like the...
  49. Well if you are using the pin in the back that on...

    Well if you are using the pin in the back that on the Teensy 3.1/3.2 is a DAC (digital -> analog converter) that can play sounds when ampified, that is your problem. The Teensy 3.0 did not have a...
  50. Since, Adafruit has its own machines with DMA and...

    Since, Adafruit has its own machines with DMA and they now have an Adafruit_ZeroDMA library that abstracts this in some sense. If we can have the same public names (using a different include file),...
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