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  1. Replies
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    Additional observation: in the process of...

    Additional observation: in the process of generating the .sym files for the different TD versions, I thought I'd tinker with some of the other optimizations (I normally build everything at "Fastest"...
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    @PaulStoffregen: Thanks for your reply to my...

    @PaulStoffregen:

    Thanks for your reply to my inquiry. I'll take a detailed look at the .sym files as recommended. If I'm not able to narrow down the resolution with that analysis, I'll post the...
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    I'm getting different results when compiling my...

    I'm getting different results when compiling my TeensyMIDIPolySynth project source between the latest TD1.54beta5 & the previous TD1.54beta4. For each test, I uninstalled Arduino, installed Arduino...
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    @MarkV: Sorry, I didn't do a good job of...

    @MarkV:

    Sorry, I didn't do a good job of making it understandable. For polyphony, you would define four oscillators/VFOs (one for each simultaneously pressed key, as many as desired - e.g. if you...
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    @manicksan: I developed everything as a single...

    @manicksan:

    I developed everything as a single (monophonic) design, then used a copying/pasting/scripting to extend it to 4-poly. Once that was verified, I took it to 8-poly, then finally to...
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    @MarkV I implemented polyphony in my...

    @MarkV

    I implemented polyphony in my <TeensyMIDIPolySynth>. The way I chose to implement my polyphony is not the only way to do it, but it is certainly one way that works:

    - define an array of...
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    Paul: I am following this discussion with...

    Paul:

    I am following this discussion with interest. I see that your test program is getting stuck at the point where it is trying to close the second file handle.

    This is completely unrelated...
  8. If you're using the T4.0, make sure to order the...

    If you're using the T4.0, make sure to order the Rev D boards.
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    I have used KiCAD for quite a number of projects....

    I have used KiCAD for quite a number of projects. I have only done one board for plugging in a Teensy 4.0 (it's currently a work-in-progress). The KiCAD parts library is quite good for what I have...
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    Sorry, I've previously tried Chrome in Windows,...

    Sorry, I've previously tried Chrome in Windows, but (according to our IT folks) I have been warned that it loads too many additional "features" & leaves too many holes open. This is definitely not a...
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    @NominalAnimal: I can report the following...

    @NominalAnimal:

    I can report the following (all tests performed offline under 64-bit Windows 10 Pro version 2004, build 19041.610):

    firefox (82.0.2 64-bit): display, editing, & moving work as...
  12. Emmanuel: I have successfully used the 74HC595...

    Emmanuel:

    I have successfully used the 74HC595 shift register to drive multiple LEDs (40 LEDs plus 2 x 7-segment displays) in my TeensyMIDIPolySynth project (see <this> post for a short...
  13. @MURDERGAMBINO: I didn't do an extensive...

    @MURDERGAMBINO:

    I didn't do an extensive analysis of all of your code, but you might try moving the analogRead() calls inside the loop() function as I've indicated above. It also seems that the...
  14. @AntonSuvorov: Take a look at my...

    @AntonSuvorov:

    Take a look at my TeensyMIDIPolySynth project for some hardware ideas on using MUXs to allow multiple pushbuttons using a minimum number of pins. You didn't mention whether your...
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    With lastMicros defined as an array of unsigned...

    With lastMicros defined as an array of unsigned longs, & currentMicros defined as an unsigned long, the following statement probably does not reflect your intent:


    if (currentMicros[0] -...
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    Are you using the same USB cable used previously...

    Are you using the same USB cable used previously ?? Did you try a different cable (in case you grabbed a charging-only cable - no data lines) ??
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    I can't tell whose set of screenshots/steps you...

    I can't tell whose set of screenshots/steps you are referring to. The Microsoft Word document with the original screen shots & steps is too large to upload (1.4M vs 470K limit). I didn't even try...
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    @defragster: Thanks for the additional input. If...

    @defragster: Thanks for the additional input. If I had to hazard a pure guess (as a certified non-expert), I'd say that this is yet another typical example of Windows functionality & control: there...
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    Seeing @defragster's post, I can change the...

    Seeing @defragster's post, I can change the references & names from 'Windows Defender" to "Windows Security" in the PDF if/as needed.

    Mark J Culross
    KD5RXT
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    @PaulStoffregen: I've made some preliminary...

    @PaulStoffregen:

    I've made some preliminary screen captures from Windows Defender as requested. I've currently pasted them into a Microsoft Word document, which I then printed to a PDF. I'm...
  21. AeluVidy: One possible brute force solution is...

    AeluVidy:

    One possible brute force solution is to check for the presence of the /dev/ttyACM0 device on the RPi before trying to use it (either do "ls -al /dev/ttyACM0" & check specifically for an...
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    Which teensy ??

    Which teensy ??
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    Michael: Here's (a modified version of) an...

    Michael:

    Here's (a modified version of) an approach that I've used in the past on an Arduino for the exact same (wear leveling) purpose:

    1) perform a one-time prep on your EEPROM by writing...
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    Sorry, I wrote an initial answer, then re-read...

    Sorry, I wrote an initial answer, then re-read your post & realized that you are storing a counter. The approach that I initially wrote would work for 4 independent byte values, but would not...
  25. From your short description, I may be...

    From your short description, I may be misinterpreting exactly what you're after. However, if I'm understanding correctly, here's one possible approach:

    Assumptions:
    - you want to sample the...
  26. @prajtm: You are welcome !! Glad that I could...

    @prajtm:

    You are welcome !! Glad that I could be of some help.

    Good luck & have fun !!

    Mark J Culross
    KD5RXT
  27. @prajtm: I did not make a thorough study of...

    @prajtm:

    I did not make a thorough study of everything that your sketch is doing, but I did notice that your loop makes 8 passes (0-7), where your arrays only have 7 members (0-6). As written, on...
  28. yeahtuna: So sorry, I definitely should have...

    yeahtuna:

    So sorry, I definitely should have read your post more closely !! Can you take some of the I/O currently in use & combine thru a 74HC4067 16-to-1 analog MUX (for input sampling) or a...
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    Each of your 75 x 10K pots will be across the...

    Each of your 75 x 10K pots will be across the 3.3VDC to GND, so if I am doing my math right, they will together all draw a constant [ 75 * (3.3 / 10000) ] = 24.75 mA of current. You will get...
  30. yeahtuna: I needed this exact same thing in my...

    yeahtuna:

    I needed this exact same thing in my TeensyMIDIPolySynth project. I ended up using a (boolean-like) variable to control driving the LED.


    int midi_note_activity_state = false;

    I...
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    Mano1979: I can't speak for whether you have a...

    Mano1979:

    I can't speak for whether you have a failed regulator or not, but I wanted to provide some clarifying info WRT one of your statements. The button on the Teensy is a "programming"...
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    Andy: Sorry, I should have posted the

    Andy:

    Sorry, I should have posted the <link> earlier for the specific battery that I used . . . it's actually small & light, but that's not necessarily a relative comment when you're talking about...
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    Don't know if it matters to your project, but be...

    Don't know if it matters to your project, but be aware that the PowerBoost 100C does not pass the D+/D- lines thru (from microUSB input to full-size USB output). I bought a panel-mount microUSB...
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    Andy: I may be answering a question quite...

    Andy:

    I may be answering a question quite different from the one that you are asking, but I have successfully used the Adafruit PowerBoost 1000C in my TeensyMIDIPolySynth project, both to power my...
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    Manu: What specific complaint do you get from...

    Manu:

    What specific complaint do you get from the compiler ?? Can you attach the source for your sketch ?? These details may make it easier to assist.

    Mark J Culross
    KD5RXT
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    Don't know if it's related or not, but that...

    Don't know if it's related or not, but that VID:PID (24c6:581a) seems to be reported <here> as having problems working with xboxdrv. Curiously, according to <this> reference, that VID belongs to...
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    Glad that I was able to help. Feel free to ask...

    Glad that I was able to help. Feel free to ask any other questions & the forum members will do our best to help if/as we can . . .

    Mark J Culross
    KD5RXT
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    1) place a tdm input object into the audio design...

    1) place a tdm input object into the audio design tool
    2) look at the "info" section (towards the right-hand side of the audio design tool)
    3) scroll down to the "Notes" section, where you'll find...
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    Whoops . . . I see that @defragster & I crossed...

    Whoops . . . I see that @defragster & I crossed in the ether.

    Mark J Culross
    KD5RXT
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    @siredward: The very first time your program...

    @siredward:

    The very first time your program calls the servoSweep() function, using the values of currentMillis (which == 0), previousMillisServo (which == 0), & servoInterval (which == 15), your...
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    Forgot to post sooner that portamento/glide is...

    Forgot to post sooner that portamento/glide is now implemented in the latest firmware (as well as a variety of other additions), source for which is posted on my Google Drive...instructions for...
  42. @TelephoneBill: Thanks much for sharing your...

    @TelephoneBill:

    Thanks much for sharing your test results. So, for general protection, should we go with earlier (@MorganS) recommendation for using a TVS diode (internal pair) for static...
  43. Thread: S/pdif

    by kd5rxt-mark
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    Dana: You're welcome . . . glad to be able to...

    Dana:

    You're welcome . . . glad to be able to help !!

    Mark J Culross
    KD5RXT
  44. Thread: S/pdif

    by kd5rxt-mark
    Replies
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    Would the Everlight ...

    Would the Everlight <PLT133/T8> work for you instead ?? It is available in single quantities for $1.41 from Mouser Electronics (in-stock) & DigiKey (20-week lead-time).

    Mark J Culross
    KD5RXT
  45. You did not explicitly say, but assuming that you...

    You did not explicitly say, but assuming that you are using the built-in ethernet PHY, did you change from this:


    #include <Ethernet.h>


    to this:


    #include <NativeEthernet.h>
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    Keith: If you are going to add traditional...

    Keith:

    If you are going to add traditional MIDI DIN connectors to your project (if you don't already have some selected), I found that <these> work very well (they fit nicely into 0.1" spaced...
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    In a similar way, my son made several attempts to...

    In a similar way, my son made several attempts to create his own "recorder" and/or "tin whistle", but quickly realized that there are many more ways to mess up the hole positions than there are to...
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    Looks nice & sturdy, yet compact. Let us know...

    Looks nice & sturdy, yet compact. Let us know how it goes . . . maybe post some pics of your project.

    Good luck & have fun !!

    Mark J Culross
    KD5RXT
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    Don't know how big your box is, but would...

    Don't know how big your box is, but would something like <this> possibly work ?? Or maybe get a bigger box ?? :p
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    Keith: Based upon a good recommendation by...

    Keith:

    Based upon a good recommendation by another forum member, here's what I used successfully in my <TeensyMIDIPolySynth> project: <Adafruit Panel Mount Extension Cable - Micro B Male to Micro...
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