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Type: Posts; User: DerekR

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    @Fritz A few of us tried using the WM8731 with...

    @Fritz
    A few of us tried using the WM8731 with the T3.6 and found a whole lotta problems with the I2C communication. The link to the thread is I2C problems with Teensy 3.6 and WM8731 codec. Paul...
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    A bit off topic but if you are want to improve...

    A bit off topic but if you are want to improve your soldering skills, here's a video showing the SMD assembly of a new Russian SDR (software defined radio) kit. It's not a tutorial, but it shows...
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    @ETMoody3 Are you going to use solder paste and...

    @ETMoody3 Are you going to use solder paste and just apply it without a mask, letting surface tension draw the paste off the solder mask? I've seen videos of this being done and it seemed to work...
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    @loglow, Will you be selling spare flex-cables...

    @loglow,
    Will you be selling spare flex-cables when the kit is released? That would make it a lot easier to replace a wonky T4 on the breakout. I know it's possible to carefully remove and replace...
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    @loglow - Dan, I think these are great decisions...

    @loglow - Dan, I think these are great decisions for the board assembly options. I'm sure a lot of people would be intiminated by the SMD assembly requirement.

    And talking of SMD soldering,...
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    Well, that was easy!!! I just specified the CS...

    Well, that was easy!!! I just specified the CS as BUILTIN_SDCARD and everything started working on both breakouts. Thanks. So it's back to the grandkids...
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    @mjs513 - You can never have enough solder braid...

    @mjs513 - You can never have enough solder braid ;) With my old, tired, shaky hands I can't get along without it.

    I've just been invaded (again) by a horde of grandkids, so Teensy stuff will have...
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    My first fail! I cannot get the SD card to work...

    My first fail! I cannot get the SD card to work on either of the two breakouts! I've tried several different cards of different sizes, checked their formatting on my PC (all are FAT32), but none...
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    Dan asked us to stress USB_Host stuff in our...

    Dan asked us to stress USB_Host stuff in our testing, but I have a small confession: I have never dealt with USB_Host software, and don't really know anything about it. Nor have I dealt with...
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    @defragster et al Here's what I think was my...

    @defragster et al
    Here's what I think was my order of assembly of the SMD components:
    C5 -> C3 -> C2 -> U2 -> C4 -> U1 -> R1 -> tiny tactile SW -> flex-cable socket -> SDcard socket -> C1 .
    Then...
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    @defragster: Some quickie photos. (I apologize...

    @defragster:

    Some quickie photos. (I apologize for the quality, I'm the world's worst photographer, while my wife was a professional photographer:confused:.
    First the two completed boards:...
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    Two fully functional boards now. Both worked...

    Two fully functional boards now. Both worked right away. I'm a happy camper...
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    All is good!!;) Pin 36 is functioning! I did a...

    All is good!!;) Pin 36 is functioning! I did a quick check on all the pins and all are blinking.
    Congratulations Dan - it was a long journey for you, but I believe you nailed it this time!
    Derek
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    It's here (in Mass)! I'm assembling as we...

    It's here (in Mass)! I'm assembling as we speak...
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    It may (?) just arrive before Xmas - seeing as we...

    It may (?) just arrive before Xmas - seeing as we are almost neighbors. I'll get to it asap, but family arrive tonight... the house will be a complete (but wonderful) disaster for the next few days...
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    Great work Dan! It's a beautifully designed...

    Great work Dan! It's a beautifully designed board and I think fixing the layout is the best long term solution for you.

    Would it be possible to get a new complete kit + an extra flex cable since...
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    @loglow - Dan - I hope I'm wrong but I suspect...

    @loglow -

    Dan - I hope I'm wrong but I suspect there's a mismatch in the order of the traces on the flex-cable and the pcb trace to pin 36 at the flex cable socket :(

    This morning I got the...
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    Well, I remembered that I'd seen T4's at the...

    Well, I remembered that I'd seen T4's at the local electronics store (You-Do-It Electronics in Needham, MA), so I jumped in the car and got the last one! So back in business tomorrow morning.

    A...
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    @loglow Dan, I've assembled the new board -...

    @loglow
    Dan,
    I've assembled the new board - thanks very much for including me. It went very well, much smoother than the first Beta - took about 3.5 hours with quite a bit of time spent...
  20. @robjohn... Nice looking unit. I really like...

    @robjohn...
    Nice looking unit. I really like the simplicity of your panel and display!! My unit(s) are still being built on protoboards with hand wiring underneath.

    I'll be delighted to share...
  21. As promised, I'm back ;) .... @robjohn - To...

    As promised, I'm back ;) ....
    @robjohn - To answer your questions:
    1) No, I'm not using the Weaver SSB method here. Although I am very fond of it, I had too many problems with the Weaver method...
  22. Hi everybody, Sorry for being so tardy in...

    Hi everybody,
    Sorry for being so tardy in replying, but I've been away from the forum for a few weeks. However, I'm now back ;) There are several questions here, let me promise to get back to...
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    @xerox, I guess you are working on a ham radio...

    @xerox,
    I guess you are working on a ham radio project - SWR/power meter? That's very interesting, I just started thinking about a Teensy 4 antenna-analyzer/auto-tuner/SWR meter myself, for after...
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    @loglow --- Hey Dan, For health reasons I've had...

    @loglow --- Hey Dan,
    For health reasons I've had to take a break from things Teensy over the past few weeks, and things got away from me. I am finally catching up and am delighted to see the...
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    Excellent! However, I have been using the PJRC...

    Excellent! However, I have been using the PJRC Encoder library successfully (no missing steps) with the T4 in an application with two encoders for several weeks now. Is there any reason to switch?
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    Hi Dan, Welcome back:D I presume you are aware...

    Hi Dan, Welcome back:D I presume you are aware of the two other break-outs that have been released over the past few weeks? Both use castellated cutouts to contact all of the under-board pads. ...
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    Yesterday I received two packages in the mail,...

    Yesterday I received two packages in the mail, (a) more T4s to destroy, and (b) samples of FRDM4236's board. So I got to work and assembled two of my slightly modified (stretched) versions of...
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    @dkryder, Don't think I gave up without trying...

    @dkryder,
    Don't think I gave up without trying :rolleyes: I sent a couple of hours trying to prise them apart... It was just not possible to heat the pins through both boards and extract the pins. ...
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    My bad, in fact my very, very bad today:( :( :( ...

    My bad, in fact my very, very bad today:( :( :( So, I was all very pleased with myself this morning when I wired up breakout #2. Everything went swimmingly, I soldered all the castellations,...
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    Well, I had a very pleasant and unexpected...

    Well, I had a very pleasant and unexpected surprise today! I had ordered my modified versions of Blackketter's breakout board in 0.8mm thickness from OSHpark before we learned of the woes with...
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    That would be fantastic, thank you very much. ...

    That would be fantastic, thank you very much. Yes, I'm in the USA (Mass). I'll PM you with the details.

    I've been getting quite frustrated lately because I've tested most of my code on the T4...
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    Looks very good, and I'd certainly like to try...

    Looks very good, and I'd certainly like to try it! I note you are using 0.8mm board thickness. Several of us have tried OSHpark with @blackketter's design with 0.8mm and found that routing of the...
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    Next questions: 1: What do think of Dan's...

    Next questions: 1: What do think of Dan's (@loglow) SMD 2x5 header to connect to the lower board vs the castellated cut-out? Personally, having built many T3.6 breakouts from loglow, I like them.
    ...
  34. Sounds to me like a "ground-loop" caused by...

    Sounds to me like a "ground-loop" caused by common currents in the power line connection. These can be real nasty to track down because they can be dependent on your wiring. I've had that problem...
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    Hi guys - How did the pogo pins on Paul's beta...

    Hi guys - How did the pogo pins on Paul's beta breakouts work out - were they reliable? While playing around in KiCad this afternoon I started wondering if that might be the way to go???
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    Michael, I'm very frustrated. I want/need to...

    Michael,
    I'm very frustrated. I want/need to get going with using the T4 in real tasks, but unless I can get at all those pins, I'm stuck. I started to build a prototyping board this morning...
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    I would think that this is a hardware problem,...

    I would think that this is a hardware problem, not a software problem, unless your sawtooth has a very, very low frequency.

    I don't follow what the sawtooth is actually doing in loop() is it just...
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    Re thicker boards - you can purchase male headers...

    Re thicker boards - you can purchase male headers with longer pins that will make the soldering easier on the top. I have a few with long pins on both sides. And it's relatively easy to move the...
  39. Andy - You beat me!!! I didn't get very far at...

    Andy - You beat me!!! I didn't get very far at all today, I could find my plastic bag of female headers :( We have a local electronics parts store that's closed on Sundays, so I'll be able to get...
  40. From defragster: J and that is where I'm totally...

    From defragster: J
    and that is where I'm totally confused!

    The T3.6 had a bunch of alternate pins for the SPI bus and it was necessary to use those alternates to have the TFT and audio board...
  41. I've run the T4 with the ILI9341 Display, and the...

    I've run the T4 with the ILI9341 Display, and the T4 with the Audio Board, but not all three together.
    That's my job for tomorrow. To be honest I'm still a bit confused as to whether they will...
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    Now there's a coincidence! Just today I uploaded...

    Now there's a coincidence! Just today I uploaded to the forum (for another member) a couple of my AudioGrabber Audio Library objects that let you extract blocks of data from the internal audio data...
  43. Thread: fft overlap add

    by DerekR
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    I found this old test sketch that I wrote a...

    I found this old test sketch that I wrote a couple of years ago. I think it might do exactly what you are asking about. As it is it doesn't do anything useful:
    1: It takes an Audio block, and...
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    @LoShu -As you requested I have attached a zip...

    @LoShu -As you requested I have attached a zip file 17804 containing two "grabbers":
    1 AudioGrabberComplex256
    2 AudioGrabberReal256
    in separate folders, each with a simple example of their use.
    ...
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    Sure. Do you want the complex or real? Give me...

    Sure. Do you want the complex or real? Give me an hour or so... I'll upload them both on the forum under this thread.

    Aside: I was getting the grabbers ready to upload as a library to GitHub...
  46. @defragster: Fantastic - works like a charm. ...

    @defragster: Fantastic - works like a charm. It was driving me crazy!
    I find it hard to believe that I'm the only one who had this problem.
    Thanks a bundle,
    Derek
  47. Teensyduino Bug(?): "Bricking" of T4 on program upload

    For the past three days I've been trying to track down a bug that "bricks" the T4 on program upload! I now believe it's a genuine problem in the Teensy code.

    I was preparing some Audio Library...
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    I've been thinking the same as @blacketter. ...

    I've been thinking the same as @blacketter. I've been playing with concurrent tasks on the two cores of the ESP32 with FreeRTOS, and I'm impressed. I believe it might be a good time to think of a...
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    I read through a press release on the 1170 today....

    I read through a press release on the 1170 today. All I can say is WOW! When I read of the dual-cores: 1GHz M7 + M4, I am already wanting to sign up! @Paul - are you taking pre-orders? I'm...
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    I was just playing with rectangular pads. I...

    I was just playing with rectangular pads. I think they would be more resistant to tearing from the board.
    However, this IS blackketter's project. I think we should respect that, and work with...
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