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  1. Replies
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    Wiring diagrams for MIDI DIN connectors show can...

    Wiring diagrams for MIDI DIN connectors show can show the plug or the socket and the notch up or down.... you are not the first to get it wrong.

    FYI resistor values are not crucial so tolerance...
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    Teensy 3.5, 3.6 or 4.1 have enough pins to...

    Teensy 3.5, 3.6 or 4.1 have enough pins to support that many switches without having to use a multiplexer or some other means of handling so many signals.

    Wiring so many switches will be very...
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    I've not used Metro but maybe it's stopping...

    I've not used Metro but maybe it's stopping bounce from seeing the tranistions.

    I think you would test timing limit after transitions but bounce is usually sufficient on its own to avoid multiple...
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    Details are at the bottom of this page...

    Details are at the bottom of this page https://www.pjrc.com/teensy/td_midi.html
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    did you handle incoming events to clear the...

    did you handle incoming events to clear the queue? That's the most common hang where Teensy's buffer fills with unhandled messages.

    https://www.pjrc.com/teensy/td_midi.html
  6. Why waste the extra speed waiting for you MUX to...

    Why waste the extra speed waiting for you MUX to settle.. set them for the next read right after the last and then go do other things... by the time you go to read it will have settled.
    ...
  7. No... reading again it sounds like you want...

    No... reading again it sounds like you want selection of a new CC value as ON to send OFF for the previous CC?

    Edit
    ...just noticed it's sending program changes and not CC...
  8. This is code I helped with.... ...

    This is code I helped with....
    https://forum.pjrc.com/threads/58017-Sending-MIDI-CC-value-based-on-last-received-value-with-midi-read

    Note if you bought his controller the switches are toggles...
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    Expression pedals used with MIDI keyboards etc....

    Expression pedals used with MIDI keyboards etc. are effectively just voltage dividers oftenwith a floor side-circuit to set the range of the sweep (on the lower end).

    There are two common...
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    ANY delay is usually enough, I've started at five...

    ANY delay is usually enough, I've started at five microseconds but one seems to do it.
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    I'm surprised to see it track a DC voltage like...

    I'm surprised to see it track a DC voltage like that but if there is no connection to A8 then even the tiniest parasitic current could charge the pin.

    I suspect your original problem was in the...
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    At the top of a pot used as a voltage divider...

    At the top of a pot used as a voltage divider there is no significant resistance to the pin from the Vcc. The current is almost entirely going out the bottom of the divider and only the smallest...
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    I'm more baffled than before... it sounds like...

    I'm more baffled than before... it sounds like you will be reading a constant 1.65 volts ...where is the signal part?

    Almost no current will actually flow into your Teensy... but if the voltage...
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    My amateur understanding of input pins it they...

    My amateur understanding of input pins it they are like op-amp inputs... very high input impedance means you can mostly ignore it provided your output impedance in on the order of KOhms.

    The risk...
  15. That's not USB midi code... you don't need the...

    That's not USB midi code... you don't need the library MIDI.h but you need to compile as Mark indicates and the call the usbMIDI object to read and write according to this page:...
  16. STATUS is a bad name for that array. Maybe...

    STATUS is a bad name for that array.

    Maybe TYPE[bank][i].

    The type and channel nibbles together are called the status byte but it's both wrong and misleading here where one might think it's...
  17. Until you want to try custom data structures the...

    Until you want to try custom data structures the best way is as vjmuzik says, another array to track what type of message.


    Integers act as stand-ins for types of messages (you can use the...
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    https://forum.pjrc.com/threads/43699-teensy-3-6-se...

    https://forum.pjrc.com/threads/43699-teensy-3-6-serial-TX-buffer-size

    Looks like your path isn't correct. Teensy after Hardware...
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    A hardware serial MIDI in connection is usually...

    A hardware serial MIDI in connection is usually protected by an optoisolator that is current based so it will work with 5v or 3.3v provided the resistor values are such that the current is still...
  20. Sound like you've got way more DIN MIDI...

    Sound like you've got way more DIN MIDI experience than I do... I have a Sparkfun MIDI board somewhere -- 5 volt only version I think but as I found my old T2.0 that would be perfect. Maybe I need to...
  21. ...I didn't test so there may be a problem with...

    ...I didn't test so there may be a problem with my code but it did compile and it pretty simple so if there's an error one of us should be able to spot it.

    edit- tested on a T2 and it the usb...
  22. #include const int...

    #include <ResponsiveAnalogRead.h>

    const int channel = 1; // MIDI channel
    const int ANALOG_PIN = A0;
    const int CCID = 15;


    byte data;
    byte dataLag; // when lag and new are not the same then...
  23. Thanks for that info. I think i knew that once...

    Thanks for that info. I think i knew that once but I don't really use UART MIDI much and never two ports.
  24. So no USB MIDI and no sysex... should be very...

    So no USB MIDI and no sysex... should be very simple.

    The 'easier still' option might be from the MIDI Soft Thru feature.

    Since it's a software thru you may be able to still send your midi in...
  25. Merge used to be very difficult if you wanted to...

    Merge used to be very difficult if you wanted to merge DIN with USB but with the 'new' USB MIDI library I believe it's very simple (but I've not bothered to try it).

    I'd be happy to help with...
  26. BTW - Both the voltage divider that is the...

    BTW - Both the voltage divider that is the expression pedal and the MIDI DIN can be driven with 3.3 v or 5 v and if you are really keen on 5 volt inputs or you did need it for some reason the Teensy...
  27. What else does the Teensy connect to and what...

    What else does the Teensy connect to and what kind of connection? (DIN/USB?)

    Is the foot-switcher DIN only?

    Any Teensy will do unless you need to be a USB host. But if you want to connect a...
  28. I think you need a pass-through sketch to test...

    I think you need a pass-through sketch to test once you have the USB host set up on Teensy... to do your MIDI testing with both as USB devices you will need the computer to echo MIDI between both...
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    Hairless is not needed because Teensy supports...

    Hairless is not needed because Teensy supports USB MIDI directly when you compile as a MIDI device (or MIDI device combined with another USB protocol).

    I don't think you can declare multiple ports...
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    You need smaller value resistors -- 47 Ohm by...

    You need smaller value resistors -- 47 Ohm by Paul's schematic (see https://www.pjrc.com/teensy/td_libs_MIDI.html).

    MIDI spec says 10 Ohm on pin and 33 Ohm to the pullup but Paul's value work too....
  31. Thread: calculator

    by oddson
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    I think pressing [+] twice on mine would skip a...

    I think pressing [+] twice on mine would skip a field... the logic should check that ordinalNum has a digit already before incrementing.
  32. Thread: calculator

    by oddson
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    untested alteration to your code will likely need...

    untested alteration to your code will likely need a few fixes to even compile but hopefully shows the alternate state variable scheme.
    #include<Keypad.h>
    #include<LiquidCrystal_I2C.h>...
  33. Thread: calculator

    by oddson
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    if (newKey != NO_KEY && (newKey == '+' )) { ...

    if (newKey != NO_KEY && (newKey == '+' )) {
    if (secondNumState == true) {
    operatr = newKey;
    firstNumState = true; secondNumState = false;
    lcd.setCursor(8, 0);
    ...
  34. Thread: calculator

    by oddson
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    It's actually very difficult to troubleshoot a...

    It's actually very difficult to troubleshoot a complex bit of code without the hardware.

    But I'm pretty sure you are not setting the state variable you've added correctly (or the others you've...
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    Looks awesome, can't wait to see the details and...

    Looks awesome, can't wait to see the details and hear the result.
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    The guitars in OMB and this home build both have...

    The guitars in OMB and this home build both have insulation steps for the strings to isolate them electrically.
  37. For some reason I thought MIDI libraries are zero...

    For some reason I thought MIDI libraries are zero indexed for channel even though I must have known better as some point in the past. :confused:
  38. if (n5 != previousA4) { ...

    if (n5 != previousA4) {
    usbMIDI.sendControlChange(controllerA4, n5, 0);
    usbMIDI.sendControlChange(controllerA4, n5, 1);
    usbMIDI.sendControlChange(controllerA4, n5,...
  39. You are a bit light with symptoms of the problem....

    You are a bit light with symptoms of the problem. (From what I see the values should almost always be the same.)

    From the code the two values are not necessarily the same because you are reading...
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    I think the OMB might be using electrical...

    I think the OMB might be using electrical reflection timing looking for the earliest electrical reflection on each string but I can not see the a how-it-works section.

    Not sure how the per-string...
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    Yes... that's my point.. could you even play...

    Yes... that's my point.. could you even play mono-phonically in any usable way or would you need to adopt a very clean 'zero-barre' playing that would be very limiting?
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    Doesn't this require the player to avoid contacts...

    Doesn't this require the player to avoid contacts other than the one they are intending to make with one fret and one string?

    And if they do make a second contact won't the read voltage be...
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    You need a VERY low cutoff as you're effectively...

    You need a VERY low cutoff as you're effectively trying to get below any fundamental so the corner frequency needs to be 50Hz or lower (and maybe much lower) and that makes the attack pretty...
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    I haven't used the audio library much... so...

    I haven't used the audio library much... so hopefully I get this correct.

    Envelope effect is a generator not a detector/follower.

    The RMS or peak objects could be used or you can filter the...
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    All my usual 'not an EE' caveats; but as I...

    All my usual 'not an EE' caveats; but as I understand it the internal reference is optional way to measure when you are interested in the absolute voltage of a signal ...when you use it the range is...
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    I realized 'fixing in software' is was wrong...

    I realized 'fixing in software' is was wrong right after posting - if it's clipped it's gone and you have a dead zone on your pot you cannot map to anything.

    That said I'm still a bit sceptical. ...
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    What's wrong with powering a mux at 5v for a...

    What's wrong with powering a mux at 5v for a voltage divided signal. Where is the overvoltage risk coming from?

    I've had very little experience with mux but I didn't find a need to pad the...
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    You don't need it if you never need it. ...

    You don't need it if you never need it.

    Getting that wiring wrong on an out or thru circuit is really easy as it's not immediately clear which direction the wiring diagram is meant to show; face...
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    First, there is only one as the second is inside...

    First, there is only one as the second is inside the PC900. The inside one is a current switch on the internal buffer

    Second, that's schematic is specifically for T2.0 and are you really using...
  50. I'm not expert but I think 3.2 never quite got to...

    I'm not expert but I think 3.2 never quite got to a working host solution and I think 3.6 or 4 are the only viable options for hosting (without a shield).

    Hosting is not properly documented on the...
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