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  • radias's Avatar
    03-23-2020, 11:26 PM
    High doses of garlic and cabbage soup significantly reduce the risk of infection by increasing social distancing. :p To be as stinky as possible keeps the coughing masses several meters away. It also helps to...
    104 replies | 2976 view(s)
  • radias's Avatar
    03-22-2020, 11:12 PM
    Again, thanks a lot. So that should work like expected. The frequency is precise to the theroretical 256*44100*2. Now I'm going to find the issue in the rest of the code. I'll open another thread once there is any...
    77 replies | 4235 view(s)
  • radias's Avatar
    03-22-2020, 08:58 PM
    Is this code fragment correct by means of selecting the right clock speed, which is twice the SPDIF speed, and frame length, wich is 256 instead of 128 bit. Is this piece of code correct? You are the big master of...
    77 replies | 4235 view(s)
  • radias's Avatar
    03-22-2020, 01:23 PM
    So I've figured out the different pins of S/PDIF on T4. And it is working. Thanks @Frank B Still, ADAT I canot get to work. It compiles, but no usable signal on the new pin, which should be also Pin 7, like at SPDIF,...
    77 replies | 4235 view(s)
  • radias's Avatar
    03-21-2020, 09:18 PM
    As I do not understand anything, I seriously doubt that I am able to make ADAT work. :p Please, it would be much more needed to have the documentation and the "Audio System Design Tool for Teensy Audio Library"...
    77 replies | 4235 view(s)
  • radias's Avatar
    03-21-2020, 09:01 PM
    I was not writing about SPDIF3 "Hardware", but about the SPDIF and SPDIF2 emulations in software. The hardware part of T4 should be standard if calling itself S/PDIF. Obviously the tool is not usable for this any more....
    77 replies | 4235 view(s)
  • radias's Avatar
    03-21-2020, 08:51 PM
    Same here. Plus the other issues with USB audio from post233510
    77 replies | 4235 view(s)
  • radias's Avatar
    03-21-2020, 08:29 PM
    I've dug through the source code. Quite cryptic, but doable at least to some extent. So I understand it is no parity generated, no frames marked, actually even not closed. At the end it may be the reason why it works...
    77 replies | 4235 view(s)
  • radias's Avatar
    03-21-2020, 06:46 PM
    A beta test requires some kind of beta documentation somewhere. If things have to be trailed by testers and there are assumptions on a crystal bowl involved, it is not even an alpha trest. So my test had no chance to be...
    77 replies | 4235 view(s)
  • radias's Avatar
    03-21-2020, 06:18 PM
    Connected a TOTX to Pin 14. It s a used part from a known-good device, as thanx to the C there is nothing else available, except useless time. It seems to have a schmitt trigger inside which leads to the result of the...
    77 replies | 4235 view(s)
  • radias's Avatar
    03-21-2020, 04:45 PM
    Uh, yes, that may be why. The amplifier of the optical input is running up AGC unil it tries to sync to some noise. But TX LED is on (Edit) or off, shows last state of pin. SPDIF. Pin 14. Did not check for more....
    77 replies | 4235 view(s)
  • radias's Avatar
    03-21-2020, 03:35 PM
    So i've tested ADAT, SPDIF and USB audio on Teensy 4.0, Windows 10 pro x64 1909 all recent. Results for type "Audio": Works only for DirectSound. input output are functional. Strange behavior in device manager:...
    77 replies | 4235 view(s)
  • radias's Avatar
    03-21-2020, 12:46 PM
    https://www.pjrc.com/teensy/adc.html But https://forum.pjrc.com/threads/44121-Teensy-LC-and-the-AREF-Pin And the CPU datasheet:https://www.pjrc.com/teensy/KL26P64M48SF5.pdf p.26ff And the MUX...
    11 replies | 284 view(s)
  • radias's Avatar
    03-20-2020, 05:26 PM
    Read the f*ing datasheet! Do not take the risk of failure, even if the shareholder demands for it.
    11 replies | 284 view(s)
  • radias's Avatar
    03-19-2020, 06:01 PM
    Every IC can leak voltage and current, especially in case of failure. So the overvoltage risk is at the digital control pins. Also, a MUX is a switch, wich acts on FET. A failure there can leak Vcc to the output....
    11 replies | 284 view(s)
  • radias's Avatar
    03-19-2020, 12:27 PM
    HCT, oh yes, use HC instead. Forgot to mention that, sorry. If still hanging on HCT, at least use 330R resistors on all signal lines connecting to the teensy to limit currents in case of failure. Regarding the pots...
    11 replies | 284 view(s)
  • radias's Avatar
    03-18-2020, 03:04 PM
    I forgot: If possible, add 6.8k and 1k resistors to both ends of your 10k pots and faders, so to get a full readout over all positions of the pot or fader. 3.3V->6.8k->pot->1k->GND That is, because the multiplexers...
    11 replies | 284 view(s)
  • radias's Avatar
    03-18-2020, 02:49 PM
    First: Be careful, the Teensy LC pins are not 5V tolerant! This is especially relevant if you power the analog multiplexers from 5V. They can then deliver 5V pullup voltage and 5V overshoot signals to the Teensy LC,...
    11 replies | 284 view(s)
  • radias's Avatar
    03-12-2020, 10:42 PM
    Yes, with brute DSP power it will be doable. At the end it would be easier to just learn how to play a keyboard, preferrably with polyphonic aftertouch and velocity. Then use a proper harp VST or whatever synth to make...
    12 replies | 344 view(s)
  • radias's Avatar
    03-12-2020, 05:19 PM
    To put the piezos to the soundboard is not exactly a good idea, because the soundboard is the thing that makes the sound and vibrates. This would trigger almost all piezos. Very hard to destinguish a weak note from...
    12 replies | 344 view(s)
  • radias's Avatar
    03-12-2020, 03:02 PM
    It could be possible to build a pickup for each string. This could even be something very simple, like a tiny LED reflex sensor on each string, because the pickup does not need to have exact acoustic qualities, but you...
    12 replies | 344 view(s)
  • radias's Avatar
    03-12-2020, 01:58 PM
    I forgot: to B. It is also possible to use one microcontroller, preferrably Teensy ;) and only one HM-13 on the central to scan all the peripheral HM-13 modules. That way you could use one central antenna or use a...
    6 replies | 174 view(s)
  • radias's Avatar
    03-12-2020, 01:42 PM
    For this purpose there are several paths: A. Build on LaRa. This requires LoRa transcievers and a microcontroller plus power supply and signal interface on all endpoints, plus a central with a microcontroller to...
    6 replies | 174 view(s)
  • radias's Avatar
    03-10-2020, 06:06 PM
    Maybe I am too stupid, but for me it is simple. Set TE to operate as mode 1, vsync. Prepare a frame buffer in RAM to operate on. Write whatever to the buffer. If TE flank high, copy the changed part of buffer to the...
    9 replies | 380 view(s)
  • radias's Avatar
    03-10-2020, 03:08 PM
    Over at Adafruit there has been someone asking. https://forums.adafruit.com/viewtopic.php?f=47&t=77714 The solution is to use the TE signal of the ILI9341 datasheet of the adafruit screen on page P.10, it is pin 39.
    9 replies | 380 view(s)
  • radias's Avatar
    03-10-2020, 02:51 PM
    So as said before, there is a short circuit between 3.3V and GND. Both 3.3V pins belong to the same rail, there is no difference except for position on the board. As said before, if the CPU has ever seen 5V, it could...
    32 replies | 713 view(s)
  • radias's Avatar
    03-09-2020, 08:42 PM
    I can not see any obvious short circuit. On pin 18 and 19 is visible the board had been contacted, also on the button-side edge the 3.3V and GND. edit: After inspecting the photos, I see that the 5V has been contacted...
    32 replies | 713 view(s)
  • radias's Avatar
    03-09-2020, 06:34 PM
    ADAT possible testing here. I have ADAT gear, just need to get some optical interface to the T4. Grr... This freaking virus brings everything to halt, so it may take a while.
    20 replies | 1457 view(s)
  • radias's Avatar
    03-09-2020, 06:14 PM
    6.1Ohms is the DC impedance of copper traces on the board. So there is a short circuit, probably on the USB side area of the board, regarding you measured on the opposite side. Note: Vbat does only need to be connected...
    32 replies | 713 view(s)
  • radias's Avatar
    03-09-2020, 03:24 PM
    What you desribe, the hot spot near the USB connector, looks like the TLV75733P is overheating. This can be due to several issues, usually a simple shortcut somewhere. Try to measure thr resistance between 3.3V pin and...
    32 replies | 713 view(s)
  • radias's Avatar
    03-04-2020, 11:48 PM
    For the touch chip, that is plan I2C. A library is here: https://github.com/nik-sharky/arduino-goodix
    10 replies | 1482 view(s)
  • radias's Avatar
    03-04-2020, 11:20 PM
    Hmm... Actually, in contrast to normal RA8876 operation, they list a different way of connecting the display to the host in ER-TFTM0784-1_Interface.pdf. That is very confusing. They seem to have routed the signals to...
    10 replies | 1482 view(s)
  • radias's Avatar
    03-04-2020, 10:18 PM
    Nice :) Have you seen the "7.84"1280x400 Display with Controller Board Datasheet" on that site? There you get the pinout of the module and on how to jumper-set the interface options. Then in "Controller RA8876...
    10 replies | 1482 view(s)
  • radias's Avatar
    03-04-2020, 09:48 PM
    oh, feel free to do so. Especially if it is ok to pay 19$ for one PC or 29$ for three PCs each year. For something that is otherwise free.
    5 replies | 428 view(s)
  • radias's Avatar
    03-04-2020, 09:39 PM
    That is why I now run two installations of Arduino on each computer. One for Teensyduino, one for the rest of Arduino. No such problems so far. As said, to avoid problems in the future, this should be recommended in the...
    12 replies | 423 view(s)
  • radias's Avatar
    03-04-2020, 08:35 PM
    Again we have a case of Teensyduino conflicting with the rest of Arduino-World. Isn't it about time to recommend a separate installation of Arduino for Teensyduino without using the library manager as the standard...
    12 replies | 423 view(s)
  • radias's Avatar
    03-04-2020, 08:22 PM
    If i read the ILI9981c datasheet correctly, this controller can be configured as 2,3 or 4 lane. So this is your choice. The Raspberry Pi has a MIPI DSI connector. As this is standardized, the screen should just work....
    10 replies | 1482 view(s)
  • radias's Avatar
    03-04-2020, 07:40 PM
    ¿why should one pay big$$ for a bloated overhead if the original functionality is free?
    5 replies | 428 view(s)
  • radias's Avatar
    02-25-2020, 01:15 PM
    Assumed that already done, when @yeahtuna wrote about having already done TVS protection. @yeahtuna: what are the specs required? That would make it easier to design a protection. The standards for Electromagnetic...
    7 replies | 421 view(s)
  • radias's Avatar
    02-25-2020, 11:07 AM
    Is the ground plane referenced to all the other rails or are only the rails and ports referenced to ground? That is, if the ground plane is about to lift beyond rails, will the TVSs safely prevent that? Also, better...
    7 replies | 421 view(s)
  • radias's Avatar
    02-24-2020, 03:18 PM
    Very cool project. An other approach with such a huge shell would have been to mount a mini ITX mobo and put in an i10 multicore to make a real racer, a wolf in a sheeps's clothing. Some flat LiPos and a BMS, a...
    2 replies | 293 view(s)
  • radias's Avatar
    02-24-2020, 12:33 PM
    motorcycle and CANbus must never be mentioned in one sentence, nor in one text :p all electronics should keep at least 3 meters distance from a motorcycle. it is already a compromise that water came close to engines...
    3 replies | 328 view(s)
  • radias's Avatar
    02-18-2020, 02:51 PM
    Thank you so much! This feature exists since 2016 and I was not aware of it. :o Should sometimes re-read the manual. Sorry to have caused confusion.
    31 replies | 3133 view(s)
  • radias's Avatar
    02-18-2020, 10:50 AM
    ok. Understand. So it may be better to prevent teensyduino libraries from showing up in Library manager. Anyway, for existing things I use 1.8.10/1.5 the way it works and for new tings I use each a separate Teensyduino...
    31 replies | 3133 view(s)
  • radias's Avatar
    02-17-2020, 08:25 PM
    Restored a backup of everything. 1.8.10, 1.5 and everything works perfectly, like it did before. btw: I've tried 1.8.12 and 1.51-beta1 on an other clean formerly arduino-free PC. Same error. What I see is the...
    31 replies | 3133 view(s)
  • radias's Avatar
    02-17-2020, 07:23 PM
    A uninstall / delete "C:\Program Files (x86)\Arduino" / reinstall solved that issue. But now it is a new feature: Teensyduino does no longer update libraries existing in the sketchbook. I just forgot how I made this...
    31 replies | 3133 view(s)
  • radias's Avatar
    02-17-2020, 05:47 PM
    Windows 10 pro x64 Arduino 1.8.12 Teensyduino 1.51-beta1 In the library manager I now get this error: "Comparison method violates its general contract!" This is something new here.
    31 replies | 3133 view(s)
  • radias's Avatar
    02-10-2020, 05:16 PM
    :D Good luck!
    11 replies | 525 view(s)
  • radias's Avatar
    02-10-2020, 02:16 PM
    It is very hard to see something in the crystal ball... What I understand from your description it says you are feeding 5V into the Teensy via the I/O lines. This will surely fry it. Anyway, the PWM signals of...
    11 replies | 525 view(s)
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