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  1. @oddson, that performance issue relates to...

    @oddson, that performance issue relates to usbHOST. I think that the issue here is the I2c is blocking so speeding up I2c has it spending less time blocking (midi).

    AIR, somewhere in this lengthy...
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    @eddevane, how about using a T4.0 with a hub...

    @eddevane, how about using a T4.0 with a hub hooked to it's usb host port allowing Windoze to see your individual devices as a single multi-cable device?
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    Just installed IDE 1.8.5 and TD 1.51 on a fresh...

    Just installed IDE 1.8.5 and TD 1.51 on a fresh updated install of Ubuntu 20.04.2 LTS and have the delayed opening of Teensyloader.
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    I2c ADC-Teensy latency may be the issue.

    I2c ADC-Teensy latency may be the issue.
  5. No problem. Not mentioned yet the possibility of...

    No problem. Not mentioned yet the possibility of ground-loop induced noise considering the low level audio being sent to the radio and how the Teensy is powered. An isolated 12-5v reg may be in...
  6. Tried a 1k pullup on the RX pins?

    Tried a 1k pullup on the RX pins?
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    Midi library V5 API

    Digging into the Teensy Midi library's API put this loopback tester together. Code is based on the example in File>Examples>Teensy>USB_MIDI>TransmitEverything.

    Running on a T3.5, USB Type MIDIx4,...
  8. Just been exploring the Cobra schematic and the...

    Just been exploring the Cobra schematic and the NPN low-side switch will not work for Pin 4 as the PTT switch more or less pulls the bottom end of the radio's speaker to ground for receive so is...
  9. Another thought on the way back to civilization....

    Another thought on the way back to civilization.

    How about an electret handheld mic and read the PTT switch state with a digitalInput pin and use two NPN low-side switches driven by the Teensy to...
  10. Another thought, on the road and staring me in...

    Another thought, on the road and staring me in the face is the Mic for a Uniden UH-012 so I took it apart. Has an electret mic and DPDT PTT switch.

    Might be a simpler way of providing a mic that...
  11. Yeah, CB was a busy marketplace for all kinds of...

    Yeah, CB was a busy marketplace for all kinds of gimmicks although some delay or reverb can greatly assist digging signals out of the noise floor at the receive end especially with SSB.
    Still have...
  12. Man, did we have fun with a tape loop and a CB...

    Man, did we have fun with a tape loop and a CB radio - 40 something years ago.

    A few questions:-

    What kind of CB, AM, SSB, FM whatever.

    Do you have it's schematic to explore whats on the...
  13. Glad you got it working. Played with a Shottky...

    Glad you got it working. Played with a Shottky bridge in front of the opto for receive and needed to drop the opto's series R from 220R to 200R to compensate for forward drop.

    With the bridge in...
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    I'm none of those so here goes. Code reads a...

    I'm none of those so here goes.
    Code reads a (green) Led pin as if an antenna picking up stray garbage looking for a trigger, and if we get one then code does some PinMode shuffling, say pulling one...
  15. Looks good to me.

    Looks good to me.
  16. Ok, mockup completed. Along the way noted circuit...

    Ok, mockup completed. Along the way noted circuit post #12 shows R118 as 10K, should be 110R.

    23288

    Don't have any BAT54s so D21/22 are 1 Amp Shottky. R204 and Red Led serve as a visible...
  17. Just adding, in hindsight should have mentioned...

    Just adding, in hindsight should have mentioned in my first reply that 1/8" TRS Midi hardware is on the build bench and although I don't have gear with CV or Gate (yet), a colleague does so the...
  18. MC74HC1GT04DFT2 has HC family input thresholds so...

    MC74HC1GT04DFT2 has HC family input thresholds so probably won't work with +3.3v input signal. You need to look at 74HCTxxx family.

    74HCT04 is a hex inverter and its outputs can source or sink...
  19. How about using a 74HCTxxx for U5, U15 and U16 to...

    How about using a 74HCTxxx for U5, U15 and U16 to buffer and level shift to 5v and power protection circuits with +5v?

    Having said that, I think the forward drop of two BAT54s needs to be taken...
  20. That's a shame, there's nothing else out there...

    That's a shame, there's nothing else out there that can do what a BCR does, buggy as they are.

    I've read that dodgy power supply caps and solder fail on USB connector can cause trouble. Been...
  21. No problem, I've been on the road. Sounds like ...

    No problem, I've been on the road. Sounds like you got it working. Well done!
  22. Some BCR communication modes can give you Midi...

    Some BCR communication modes can give you Midi feedback depending on how it's mapped by the host so it might pay to double check which mode the BCR is set for and what the host is trying to do with...
  23. Sorry it's given you a headache so I tidied it up...

    Sorry it's given you a headache so I tidied it up for a photo.

    23131

    Yellow wire > TX pin
    Red wire > +3.3v
    Black wire > 0v
  24. Yup. That's how I wired it so that's how I drew it

    Yup. That's how I wired it so that's how I drew it
  25. No problem and yes, those are 1k resistors.

    No problem and yes, those are 1k resistors.
  26. Sorry about the delay, distracted by other work....

    Sorry about the delay, distracted by other work.

    A single NPN pulling something LOW will work as an inverting buffer and the receiving device won't like it.

    A PNP transistor pulling HIGH works,...
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    Reporting good news. Upgraded MIO-10's firmware...

    Reporting good news. Upgraded MIO-10's firmware and plugged in a T4.1 as Midix4 with just the blink sketch and IConfig sees 4 ports. YeeHaa, now we're makin' bacon!

    I cannot say if upgrading the...
  28. From the pic it looks like the Cathode end of the...

    From the pic it looks like the Cathode end of the zener is connected to the LC's TX pin and considering that it works as a shunt, the Anode would be connected to Ground.

    After thinking on it I...
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    Duty of care to curiosity here to try that with a...

    Duty of care to curiosity here to try that with a T4.1 on a MIO-10. What IDE and TD versions did you use?
  30. AFAICT the zener looks like it's intended to...

    AFAICT the zener looks like it's intended to protect the Teensy TX pin from any incoming excess voltage via the Midi out port. A 5.6v zener may be appropriate for a +5v board but I think that a 3.6v...
  31. This thread may be worth checking out. ...

    This thread may be worth checking out.

    https://forum.pjrc.com/threads/63347-Cutting-Vin-from-Vusb-and-bricking-Teensy-3-2-in-the-process

    All the best.
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    Teensy LC is not +5v tolerant so I strongly...

    Teensy LC is not +5v tolerant so I strongly suggest you connect the +5v pin of the joystick module to the LC's +3.3v pin.
  33. Thanks Paul. I2c is driving 6x NeoTrellis so...

    Thanks Paul. I2c is driving 6x NeoTrellis so there's some length and inevitable stray C and the Trellis likes pullups at the far end. An LC needed pullups at the board end as well.
  34. Just looking at the same issue here, soldering up...

    Just looking at the same issue here, soldering up a T4.0 and am wondering does it make sense to use the series 100R on any T4x digital output pin in use?
    In my case, using SCL,SDA and TX3, the...
  35. The Midi library has Thru turned on by default so...

    The Midi library has Thru turned on by default so to turn it off add this line to void setup();


    MIDI.turnThruOff();
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    If you don't mind playing with transistors, this...

    If you don't mind playing with transistors, this will probably work:-
    22851
  37. The usual Fet and two resistor level shifter...

    The usual Fet and two resistor level shifter works well in this situation.

    I've found the Mega to be an electrically noisy board and displays can add their share of noise as well. Hooking 'em up...
  38. Many buttons? Adafruit's NeoTrellis may be worth...

    Many buttons? Adafruit's NeoTrellis may be worth looking into..
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    Interesting kit. A quick look at the T4.1...

    Interesting kit. A quick look at the T4.1 indicates that you could hook up an ILI9341 SPI screen, encoders or whatever and it looks like an excellent starting point. You might consider fitting...
  40. Based on @oddson's example, chiseled out of a...

    Based on @oddson's example, chiseled out of a larger project, tidied up and tested. Buttons do Note#, CC# or Toggle CC#.
    Hope is helpful for a worthy cause.


    /* Works on T3.2, Usb type = Midi
    ...
  41. Thank you Kris, O display genie. Looks awesome....

    Thank you Kris, O display genie. Looks awesome.
    @wrightflyer, no - just distracted by the mundane so is next cab off the rank to play with.
  42. Perhaps a #define to use the UTouch lib,...

    Perhaps a #define to use the UTouch lib, otherwise default to XPT as per PJRC's display.

    Hands up for a "multi page" example here as well.
  43. Just did this, nicked from another project for...

    Just did this, nicked from another project for T3.2, T3.5 and T3.6, tested working on a T3.2.


    #if defined(ARDUINO_SAM_DUE) || defined(USBCON) || (__MK20DX256__)|| (__MK64FX512__) ||...
  44. Oops, sorry I missed this thread. If you want the...

    Oops, sorry I missed this thread. If you want the Teensy to work as a Midi - usbMidi interface this might be a useful starting point:-


    /* Create a "class compliant " USB to 1 MIDI IN and 1 MIDI...
  45. Standards are all very well if everybody uses...

    Standards are all very well if everybody uses them and some Midi gear manufacturers seem to have their own ideas. One piece of kit I looked at needed around 7.5 Ma for its Midi input.

    3.3v Midi...
  46. Have you tried swapping the orange and white...

    Have you tried swapping the orange and white wires?
  47. I built a personal audio monitor for vocal...

    I built a personal audio monitor for vocal practice and originally used a stereo + mic jack and ran into feedback both mechanical (from the mic being physically attached to the headset) and...
  48. You might try this :- #include ...

    You might try this :-


    #include <Wire.h>
    #include "Adafruit_Trellis.h"
    #include <MIDI.h>
    // then we need to tell the library which Uart to use
    // So, assuming you have connected Midi I/O...
  49. Thank you Kris. All the best.

    Thank you Kris. All the best.
  50. Hi Kris. Double thank you again. Playing around...

    Hi Kris. Double thank you again. Playing around exploring limits and came up with this:-

    21717

    Very useful for visual feedback, hooked up to 16 encoders. Slider heights are 80 and with the...
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