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Type: Posts; User: Andy Belov

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    Thanks, MarkT. This is my first board of this...

    Thanks, MarkT.

    This is my first board of this complexity and I'm still learning while doing it.
    The weird thing is that it all works absolutely fine while powered from USB. No audio noise, no hot...
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    A sad update. I've found Adafruit's diagram...

    A sad update.

    I've found Adafruit's diagram for the 1000C board and decided to "reflow" it onto my board. Got all of the specified parts, all in proper footprints, and made a new board with the...
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    Need more sound sample memory

    I want to load a few instrument samples (flute, piano, drums, etc.), but run out of memory quickly.
    Is there a way to "move" memory from "Program" to the "other". Now its usage is 4% vs. 65%. To get...
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    Thanks for checking my posts, defragster. I...

    Thanks for checking my posts, defragster. I didn't delete them. I tried to fix some typos in them and the moment I started to type they just disappeared, so I had to do it again. Doesn't matter.
    But...
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    Thanks, KD5RXT. I'm just going to see if the...

    Thanks, KD5RXT. I'm just going to see if the board works, which it does, as you say. Them I'm going to "reflow" it to my absolutely awesome guitar/keyboard/composer board.
    8 hours is amazing, but...
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    Thanks guys. Just got the 1000C at DigiKey. Looks...

    Thanks guys. Just got the 1000C at DigiKey. Looks twice as complex as what I had, but I hope it works.
    Will let you know.

    This is so strange. This is the third time I'm posting a reply and they...
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    Turns out that it's my battery charger. When I...

    Turns out that it's my battery charger. When I use power from the PC USB, the USB host works fine.
    As soon as I enable the battery charger, the USB host never puts out the 5V. I'm sure the charger...
  8. Silly me, totally forgot about it. Looked it up...

    Silly me, totally forgot about it.
    Looked it up and see the resistors suggested ranging from 1K to 220K.

    What resistors would be good for the Teensy Audio Board?
    I guess 220K will loose more...
  9. How to combine mono and stereo line inputs

    I'm making a guitar effect "pedal" based on Teensy 4.1 and the Audio Board.
    It also has a Line Input, for "play along".
    The problem is that the guitar has only one channel, but I have to split one...
  10. Just for a comparison, I've ordered 5 PCB's at...

    Just for a comparison, I've ordered 5 PCB's at JLCPCB.com, in China, ($2 for all 5) on Saturday.
    They were made in 2 days and shipped via DHL on Sunday night, for $17.
    I got them in New York on...
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    Just noticed that the library for it was updated...

    Just noticed that the library for it was updated 4 months ago: https://github.com/adafruit/Adafruit_CAP1188_Library
    Want to give it a try? I can do it only in about a week or two.
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    Thanks for clarifying, Paul. If this is how it...

    Thanks for clarifying, Paul.

    If this is how it works, that's fine. It just makes it difficult to understand what's happening sometimes.

    The confusing part was that the test sketch seemed to...
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    New findings. It has to do with the Teensy...

    New findings.
    It has to do with the Teensy ports, the way Arduino sees them.

    This morning, after a PC reboot, I plugged in the bare Teensy 4.1 with nothing on it.
    The port name that Arduino...
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    What Teensyduino you guys are using? I got the...

    What Teensyduino you guys are using?
    I got the latest a couple of days ago: 1.53 with Arduino 1.8.13

    I just got a new and untouched Teensy 4.1, connected the power, loaded the test, see "USB Host...
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    I ran this example, which worked fine with Teensy...

    I ran this example, which worked fine with Teensy 4.0: C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\USBHost_t36\examples\Test\Test
    No response, no 5V.
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    I never got anything back from Adafruit on this....

    I never got anything back from Adafruit on this.
    It kind of worked with the delay suggested above, but overall the sensors were not usable for me - no reliable response to fast touch/release.
    I...
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    Thanks everybody for your help and advises....

    Thanks everybody for your help and advises.
    Well, turns out that all I needed was to turn up the amplification on my guitar preamp.

    I put a couple of potentiometers for that and made sure that my...
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    Teensy 4.1 - don't have +5V on USB host

    I have the USB host GND connected to the common GND. Is that the problem?
    I use my own PCB. Should I connect USB GND to the USB connector only?
    The funny thing is that there is +5V between "5V" on...
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    Thanks for the video, boxxofrobots. I do have...

    Thanks for the video, boxxofrobots.

    I do have a bunch of those capacitors, maybe not enough or not in the right places.
    Will experiment with that. Just not sure about the capacity and the...
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    Hi MatrixRat, Tried to lookup "sharp edge...

    Hi MatrixRat,

    Tried to lookup "sharp edge decoupling", didn't see anything relevant.
    Can you clarify please?
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    This is my board, with the ground highlighted....

    This is my board, with the ground highlighted. Just don't see how I can improve much there, other than do some copper fill here and there, probably on the green side.
    The whole thing is 6x8 cm.
    All...
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    Thanks boxxofrobots, I'll try the star...

    Thanks boxxofrobots,

    I'll try the star grounding in my next version of PCB. Just ordered this one from JLCPCB yesterday.
    On this version, I'll try adding components one by one and see which one...
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    @jonr. My thingy is battery-powered. Would...

    @jonr.
    My thingy is battery-powered. Would really hate to have 2 separate batteries, but I'll give it a try, just for the heck of it. The ground will still be common, though.
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    Thanks @ETMoody3 I figured out the screen...

    Thanks @ETMoody3

    I figured out the screen noise, it's quite "obvious": the noise is clearly related with what's happening on the screen.
    I'll try to find a way to turn all SPI communications...
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    Do you do copper fill on your PCB?

    I make a Teensy 4.1 based sound effects processor and have my guitar preamp very close to the Teensy and audio processor.
    I can hear some digital noise on the guitar input and want to minimize it.
    ...
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    @sockmonkey Didn't touch the library and not...

    @sockmonkey
    Didn't touch the library and not going to.
    I just need to get by to make my guitar and keyboard effects thingy to work and start making it.
    Maybe later I'll take a look at the whole...
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    My answer in two words: forget it. I've spent...

    My answer in two words: forget it.

    I've spent maybe a week trying to create/delete effects and connections between them dynamically and gave up. It works for 2 or 3 times, then the poor little...
  28. As a very responsible citizen, I go further. I...

    As a very responsible citizen, I go further.
    I not only cover with mask, but also plug some orifices to protect the others from an accidental exhaust.
    There is still so much unknown about the...
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    Jim, man, this is so sad. Ever heard of a donkey...

    Jim, man, this is so sad. Ever heard of a donkey named Eeyore?
    Put it on GitHub and post a link to it here and on arduino.cc forum.
    This is what I'm going to do.

    Just make your stuff user...
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    Thanks Matrix, This is pretty much what I have...

    Thanks Matrix,

    This is pretty much what I have now, too. I also have buttons and hope to do the scroll list this week.
    Also a text box with on-screen keyboard sometime soon.

    I have the code on...
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    Thanks Brian, This does look smooth. The...

    Thanks Brian,

    This does look smooth.
    The problem is that this kind of libraries probably depend on support for specific displays.

    I'm saving all the good things people suggest here and will...
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    Thanks Jim, I've started my own little thing...

    Thanks Jim,

    I've started my own little thing here, just what I need, which is not much. I'm half-way done.
    Looks like it may be longer to accommodate other people's things than make your own.
    ...
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    Yes, it does look very impressive. Thank you for...

    Yes, it does look very impressive. Thank you for pointing this out.
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    Any way will work. You define the connecting...

    Any way will work.
    You define the connecting points when you create the connection and can only connect/disconnect later. You cannot change the points of an existing connection.
    If you...
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    Use the low-temp paste. Takes 10 seconds to heat...

    Use the low-temp paste. Takes 10 seconds to heat up the chip, remove it, wipe off the extra paste, move the chip around to make the paste adhere to the pads only and put it back on.
    I've done it...
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    I just do "new AudioConnection(...), like you...

    I just do "new AudioConnection(...), like you show. You don't have to call ->connect(). If you don't need it, just "delete". It disconnects.
    Having them "pre-made" is a pain, as you need to give...
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    Thanks @palmerr, I'm pretty good with the heat...

    Thanks @palmerr,

    I'm pretty good with the heat gun and low-temp paste.
    The trick is to put a little paste all around, then heat up the whole chip and move it around the pad a little.
    Then the...
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    Just found this:...

    Just found this: https://www.mouser.in/datasheet/2/256/DS4420-1095341.pdf
    Looks like what I need. $3.22 on DigiKey, not bad:...
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    What programmable gain amp to use?

    I want to add a programmable gain amplifier to my Teensy-based guitar "pedal", so that I can use guitars with different pickup levels.
    I already have the buffer with gain 1, so I'll put the amp...
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    Looking for a "GUI" library for ILI9341

    I need to add a user interface to my Teensy 4 with ILI9341 touchscreen.
    Looking for common things like edit boxes, scroll lists, on-screen keyboard, some kind of menu selectors, etc.

    Can do it...
  41. Got this:...

    Got this: https://learn.adafruit.com/adafruit-airlift-featherwing-esp32-wifi-co-processor-featherwing/overview
    Giving up after a few hours.
    Getting "Communication with WiFi module failed!" in...
  42. Thanks @prickle. Those little invisible to me...

    Thanks @prickle. Those little invisible to me things would be killing me. Never in my life I'd figure out that the damn thing doesn't work just because I need 100 Ohm resistor here or there.
    Well,...
  43. I think I'll try what @MichaelMeissner suggested....

    I think I'll try what @MichaelMeissner suggested. I didn't know that ESP32 had both WiFi and Bluetooth.
    I'll get this:...
  44. Thanks guys. I found this:...

    Thanks guys.

    I found this: http://www.digikey.com/product-detail/en/espressif-systems/ESP-WROOM-02/1904-1009-1-ND/8544304
    It's $2.70, which is important because I want to sell my "super awesome...
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    Need help with battery charger

    I got the schema from here: https://blog.zakkemble.net/a-lithium-battery-charger-with-load-sharing/
    The battery is charging at 100ma. I checked it using the jumpers for this purpose.
    The diod gets...
  46. Ok, thanks. I guess I'll just connect it and see...

    Ok, thanks. I guess I'll just connect it and see how it goes. It it works, I may ditch the Bluetooth in favor of WiFi.
  47. Who has ESP8266 (WiFi) working with Teensy 4.0?

    I did search this forum for this, but didn't see any definitive guide or results.

    Looks like for a few dollars more I can add a WiFi to my setup.
    If anybody has it working with Teensy 4.0, please...
  48. It works with the modified example I've posted on...

    It works with the modified example I've posted on 10-06-2019, 07:19 PM above.
    One thing I've noticed is that you have "TFT_RST 8". Don't know if there is a point in this, as it has to be on +3.3V...
  49. Well, the "flat-baking" of Teensy worked the...

    Well, the "flat-baking" of Teensy worked the first time and that's it. Tried 2 more time and wold get shorts all the time. It's hard to control the paste between the boards.
    Gave up on that, ordered...
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    "Phaser" sound from microphone

    I just tested my PDB's audio part, which is a "reflow" of Paul's Audio Board.
    The Guitar sketch works (synthesis), line input, phones, lien out work.
    The microphone works, but the sound is like the...
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