Forum Rule: Always post complete source code & details to reproduce any issue!

Search:

Type: Posts; User: MatrixRat

Page 1 of 5 1 2 3 4

Search: Search took 0.00 seconds.

  1. Replies
    8
    Views
    304

    Switchmode power supplies can have poor noise...

    Switchmode power supplies can have poor noise figure when lightly loaded and worse if input is noisy. Generally a load of around 20% of the rated capacity shuts them up considerably. Try loading it...
  2. As far as color seletion goes, have built a...

    As far as color seletion goes, have built a HSV-based approach which provides 16 colors and 16 levels each of Saturation and Value which works well with the display. Colors are chosen with eg. Ox0FF...
  3. Thank you again Kris. Here's the current action:...

    Thank you again Kris. Here's the current action:

    24452

    Horiz slider indicates that we're looking at Block 2 of 10. Now that individual item color selection is working, next is to play with how...
  4. Playing around with a Horizontal slider and...

    Playing around with a Horizontal slider and discovered that Snap doesn't seem to work and while setting up this example code found artefacts to do with handleShape(5) - only.


    24441

    And the...
  5. Replies
    13
    Views
    444

    From memory, I think the 6N137's EN pin needs to...

    From memory, I think the 6N137's EN pin needs to be pulled to 0v.
  6. Got it working, not without a struggle. The...

    Got it working, not without a struggle. The latest lib tweak cleaned up loads of bits and pieces but did not evict the PacMan effect so played with Round of different sizes and discovered that if you...
  7. Basically, playing around with MIDI stuff. Built...

    Basically, playing around with MIDI stuff. Built a few controllers with pots, love 'em or otherwise, and then encoders, flying blind with no knob pointer... want something to remember and show where...
  8. Got the Multi-Screen example working, encoder...

    Got the Multi-Screen example working, encoder trails gone.

    Have adjusted the foundations of my project to use the new library tho have the devil of finer detail namely getting the array system...
  9. @KrisKasprzak, just grabbed it thank you.

    @KrisKasprzak, just grabbed it thank you.
  10. Was just gonna post about handle droppings and...

    Was just gonna post about handle droppings and 1200 lines of code. Have created an array setup of 8 pages of 16 slider elements enabling ILI9431_t3_controls and 16 encoders to scroll thru the lot....
  11. Replies
    6
    Views
    197

    Windows uses it's standard USB-MIDI driver to see...

    Windows uses it's standard USB-MIDI driver to see the Teensy which is single-client so you can only make ONE connection to it.
    A couple of suggestions:-

    Connect the Teensy to a virtual Midi pipe...
  12. Replies
    31
    Views
    1,067

    pinMode(pin,INPUT_PULLUP); where pin = the...

    pinMode(pin,INPUT_PULLUP);

    where pin = the relevant RX pin.
  13. The Teensy LC has enough pins to look at 2 pots...

    The Teensy LC has enough pins to look at 2 pots and 13 buttons without any multiplexer unless you want to add other hardware.

    The example Many_Button_Knobs can easily be tweaked to suit. Are you...
  14. Replies
    27
    Views
    2,373

    In a word, no to Serial. Updating the firmware...

    In a word, no to Serial.

    Updating the firmware of the MIO-10 enabled it's host to see a multi-cable usbMIDI Teensy, a Beatstep pro or a BCR-2000 although I don't ordinarily use the last two via...
  15. @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...
  16. Replies
    57
    Views
    15,883

    @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?
  17. Replies
    76
    Views
    2,517

    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.
  18. Replies
    3
    Views
    223

    I2c ADC-Teensy latency may be the issue.

    I2c ADC-Teensy latency may be the issue.
  19. 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...
  20. Tried a 1k pullup on the RX pins?

    Tried a 1k pullup on the RX pins?
  21. Replies
    0
    Views
    251

    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,...
  22. 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...
  23. 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...
  24. 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...
  25. 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...
  26. 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...
  27. 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...
  28. Replies
    15
    Views
    869

    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...
  29. Looks good to me.

    Looks good to me.
  30. 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...
  31. 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...
  32. 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...
  33. 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...
  34. 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...
  35. 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!
  36. 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...
  37. 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
  38. 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
  39. No problem and yes, those are 1k resistors.

    No problem and yes, those are 1k resistors.
  40. 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,...
  41. Replies
    27
    Views
    2,373

    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...
  42. 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...
  43. Replies
    27
    Views
    2,373

    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?
  44. 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...
  45. Replies
    6
    Views
    1,780

    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.
  46. Replies
    3
    Views
    261

    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.
  47. 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.
  48. 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...
  49. 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();
  50. Replies
    13
    Views
    821

    If you don't mind playing with transistors, this...

    If you don't mind playing with transistors, this will probably work:-
    22851
Results 1 to 50 of 216
Page 1 of 5 1 2 3 4