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  1. Thanks for looking into this Paul. I'm guessing...

    Thanks for looking into this Paul. I'm guessing the issue much be related to that particular customer's system.
  2. Opps. I missed 'not'. I meant to say the "The...

    Opps. I missed 'not'. I meant to say the "The only thing I'm not entirely...
  3. Here's the schematic. The only thing I'm...

    Here's the schematic. The only thing I'm entirely sure about is the resistor on Vo.
    17939
  4. I think it's fine that you're specifying the...

    I think it's fine that you're specifying the 6N138. My motive for asking here is that I have customer experiencing some issues with dropped MIDI messages through my MIDI in DIN and I'm looking for...
  5. MIDI DIN in: Why is the PC900 optocoupler not recommend for Teensy 3.x anymore?

    If you take a look at the MIDI DIN in schematics for Teensy devices, you'll see that a different optocoupler is recommended for Teensy 2 and Teensy 3.x.

    About three years, that same page...
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    A fabrication disaster in China

    I'm in the process of getting some devices fabricated in China. After the boards were fabbed, but before assembly had started, I noticed a potential issue with my design. I contacted them and paid...
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    I have a solution. I hacked pins_teensy.c ...

    I have a solution.

    I hacked pins_teensy.c

    This is what it looked like before:


    void _restart_Teensyduino_(void)
    {
    cli();
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    Restart Teensy 2.0

    I've got some code that reboots a Teensy 3.2 just fine.


    #define CPU_RESTART_ADDR (uint32_t *)0xE000ED0C
    #define CPU_RESTART_VAL 0x5FA0004
    #define CPU_RESTART (*CPU_RESTART_ADDR =...
  9. Raw_HID is producing that noise, and I suspect...

    Raw_HID is producing that noise, and I suspect the Serial port would as well. In my tests, I would only send a message over the serial if noise was detected. And the fact that no Serial messages...
  10. If I don't send the RAW_HID data, there is no...

    If I don't send the RAW_HID data, there is no noise (at least no bad spikes that make me want to rip my hair out). I indeed test this by sending out data over a hardware serial port as well.


    ...
  11. Dealing with noise generated by sending data over USB

    I'm struggling to get rid of some noise that is creeping into analogRead() measurements in a sensitive analog circuit based on a custom Teensy 3.2 board.

    After thorough investigation, I find that...
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    You will have to roll your own solution. Another...

    You will have to roll your own solution. Another thing I can think of would be to set a timer that periodically sends date to the host. If the function returns 0 bytes sent, you could likely infer...
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    I'm not sure it this would work, but couldn't you...

    I'm not sure it this would work, but couldn't you read the voltage on the USB 5v when an analogRead?
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    if (usb_configuration) { }

    if (usb_configuration) {

    }
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    It's definitely causing small problems with the...

    It's definitely causing small problems with the ADC; I wouldn't have hooked up the scope in the first place if there wasn't an issue. The noise level isn't so much terrible as it is a nuisance that...
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    No dice. Thanks for your suggestions, though. I...

    No dice. Thanks for your suggestions, though. I don't think there's anything I can do. Even if I connect the teensy input pin directly to Vcc/2, GND or VCC, I still get that noise.
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    Teensy 3.2 Noise generated by analogread

    Hi, all. I have a problem with noise in my opamp circuit for reading an AC signal. Based on my tests, the noise appears to be generated by the call to analogRead. Below is the output of my scope. ...
  18. Thanks, Paul. Thanks for taking the time to...

    Thanks, Paul. Thanks for taking the time to answer this question so thoroughly. The sector writing seems to be exactly what I would need, but I'm worried that it's a bit above my skill level. I'll...
  19. Teensy 3.2 Lock Bits and firmware updates

    Is it really not possible to have a secure device while also allowing its firmware to be updated without pressing the program button? If we enable the lock bits, then _reboot_Teensyduino_() doesn't...
  20. Issue with keyboard interfaces in 3rd party USB Host ports

    I make devices with multiple class compliant interfaces USB MIDI / RAWHID / KEYBOARD. These devices are often plugged into the USB Host ports of 3rd party hardware.

    I've noticed that some USB...
  21. Thread: Midi 2.0

    by yeahtuna
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    No, it's not secret. I created a new account and...

    No, it's not secret. I created a new account and I was able to download the spec from that link in the first post.
  22. Thread: Midi 2.0

    by yeahtuna
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    That link has a conceptual map of how it works. ...

    That link has a conceptual map of how it works. The specification is available for download to registered users on MIDI.org, but I had issues creating an account. I'll have to fire off an email.
    ...
  23. Thread: Midi 2.0

    by yeahtuna
    Replies
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    Midi 2.0

    It's coming.

    https://www.midi.org/articles-old/midi-manufacturers-association-mma-adopts-midi-capability-inquiry-midi-ci-specification
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    I totally agree that 24bit/48k is the minimum for...

    I totally agree that 24bit/48k is the minimum for any prosumer audio gear--not because anyone can tell the difference, but just because it's the industry standard. You would be a marketing failure...
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    6 MKL04 Bootloader Chips for sale

    The title says it all. $20 including shipping to pretty much anywhere in the world. I've switched to the smaller chips, but it would be nice to find a home for these guys. Let me know if you're...
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    Sounds good, Paul. I would obviously be...

    Sounds good, Paul. I would obviously be extremely pleased to see this functionality added, even if it's only for my future designs. It's there any public information about Teensy 4.x? Would like...
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    Yes, encrypted firmware updates.

    Yes, encrypted firmware updates.
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    Uploading encrypted firmware support

    Hi Paul,

    Years back you mentioned that you might include this if there was enough interest and funding available. How much money are we talking about?
  29. Custome Teensy 3.2 Ground planes with GND and AGND

    Hi all,

    I've been making custom Teensy devices for a while and just recently I've noticed the importance of segregating analog and digital circuits with respect to their ground paths. I have a...
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    I resolved the issue. It had nothing to do with...

    I resolved the issue. It had nothing to do with the trigger circuits. The culprit was my MIDI Out DIN. I had the port grounded to AGND. I connected it to the digital GND and the voltage spikes...
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    Here's a diagram of an 8 - input circuit, showing...

    Here's a diagram of an 8 - input circuit, showing the location of capcitors.15211
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    Hi Bryan, Thanks again for all your help. ...

    Hi Bryan,

    Thanks again for all your help. I've managed to get 12 of those circuits together and have been able to wire up my entire e-drum kit to my breadboard module. The circuitry is...
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    I managed to find a solution for detecting the...

    I managed to find a solution for detecting the 'bell' and 'edge' switches, and project is progressing nicely. I'm not rectifying the data. Thanks again for your help.
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    Weather the value is negative or zero, because it...

    Weather the value is negative or zero, because it is rectified it in the circuit, doesn't have much bearing on your ability to catch the peaks. Being able to measure the phase of the signal,...
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    In terms of processing?

    In terms of processing?
  36. Replies
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    Your circuit is very nice and produces really...

    Your circuit is very nice and produces really clean data. Thank-you so much. I spent an hour this evening playing around with it. I followed most of your recommendations and then explored a bit to...
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    I tried putting a low pass filter on the my 1.65v...

    I tried putting a low pass filter on the my 1.65v supply, and I found 100ohm / 10nF to work very well.
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    I will try this to see if it gives me cleaning...

    I will try this to see if it gives me cleaning data.


    Diode compression network...That's something I'm going to have to research. How does it work? I'm currently trying to figure out how to...
  39. I've tested the MKL04. Seems to be working...

    I've tested the MKL04. Seems to be working properly. When powered up, pin 8 has 3.3v. When I press the program button, it drops to almost 0v.
  40. I've already replaced the voltage regulator in...

    I've already replaced the voltage regulator in the unit, so I can't measure the voltages at this point.

    I know the source of the short circuit was the voltage regular, however. I tested the...
  41. Ya, the device was powered up and...

    Ya, the device was powered up and programmed--maybe it saw 10 seconds of running time. And ya, I have sold a couple hundred others without issue.
  42. Diagnosing cause of short circuit in defective custom Teensy 3.2

    I've gotten one of my devices returned back to me as being defective. I opened it and noticed the voltage regulator that brings the USB +5v down to 3.3v was overheating. It turns out that there was...
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    I'm going to try this op-amp. ...

    I'm going to try this op-amp.

    http://www.ee.ic.ac.uk/pcheung/teaching/E2_experiment/MCP604.pdf

    Any recommendations of a FET?
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    That sounds like a good idea. I will look for an...

    That sounds like a good idea. I will look for an appropriate FET. But I still want to find an appropriate op-amp. Especially on that I can use to turn the AC current into DC with a center bias of...
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    Recommendation for piezo buffer op-amp

    Hi all,

    I'm working on building a MIDI drum brain. I have a working prototype with 20 inputs, but I'm finding that the data from the piezo isn't as precise as I would like. I suspect this is...
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    So I managed to make this function...

    So I managed to make this function multi-threaded. I needed up to four threads to use it on four separate Teensy devices, so I changed the declaration of rv_event to be an array of HANDLES, ditched...
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    Question about mutex in rawhhid_recv

    Recently I've but a victim of slow HID read speeds in recent versions of Windows 10. I've had to increase my timeout values from 2ms all the way up to 50ms to prevent losing data. The real problem...
  48. Just a quick update to this thread. I tested...

    Just a quick update to this thread. I tested making a second usb_descriptor_list_t and softcoded NUM_ENDPOINTS and NUM_INTERFACES, and was able to selectively load two separate device...
  49. So I tested and was able to modify the HID usage...

    So I tested and was able to modify the HID usage page on the fly. I removed 'static' from the following line of code from usb_dev.c so that I could expose it using extern in usb_dev.h.

    uint8_t...
  50. For now, I'm only interested in being able to...

    For now, I'm only interested in being able to change the usage and usage_page of an HID device and I'm guessing that won't be so hard as I wouldn't need to change the size of the descriptor. But...
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