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    I can also highly recommend the SPI version,...

    I can also highly recommend the SPI version, MCP23s17. especially as the set up of all eight chips on one CS line works very fast on polling loop, so no need to worry about dealing with interrupts...
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    @RIchard, will get it in the post in the next day...

    @RIchard, will get it in the post in the next day or two. Board is populated with everything other than the rotary encoders.
    feel free to delete you address from above message, I have taken a copy....
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    @RichardFerraro - i stuck with 100nf capacitors....

    @RichardFerraro - i stuck with 100nf capacitors. the circuit is fundamentally the same as the PCBoard used here: https://forum.pjrc.com/threads/64850-16-rgb-rotary-SPI-port-expander-panel-testers
    ...
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    very impressive 16n fader controller for cv...

    very impressive 16n fader controller for cv control of eurrack modules:

    https://www.youtube.com/watch?v=RWA2ovimEkA&feature=emb_logo

    open source:
    https://github.com/16n-faderbank
  5. Thanks for that chart KurtE, I keep coming back...

    Thanks for that chart KurtE, I keep coming back to it and it keeps ptoviding options.
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    of course, the MAX is only 12bit, so no ES-9...

    of course, the MAX is only 12bit, so no ES-9 comparison, but will get you up and running. would be good to hear your experiences of cv input
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    Here is an image of the relative sizes of the...

    Here is an image of the relative sizes of the Teensy 4.1 and the MAX11300 breakout module.
    23555

    there is a very short example of octave pitch and slide voltage here:
    https://youtu.be/sTwCMwH0qiw
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    @JML, I am using the MAX11300 breakout board in...

    @JML, I am using the MAX11300 breakout board in my setup for voltage output being controlled ny the Teensy, and precision is fine. I use its to output -5v to +5v, but as you say, it can also be set...
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    Prok drum modules: ...

    Prok drum modules:

    https://prok.co.uk/pages/eurorack/

    Bassdrum, Snare, Hi-Hat and Hand Clap.
  10. 16 rgb rotary SPI port expander panel - testers?

    hi there, I have had some panels fabricated and am looking for a bit of testing. I have two SPI port expander panels for 16 RGB rotary encoders available if there is someone out there who can use one...
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    @KurtE, many thanks for the clarification. As...

    @KurtE, many thanks for the clarification. As suspected, but good to hear / see RE Class.

    priority is SD, I will run tests to see how SPI or SPI1 handle mixed CS for the different chips on same...
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    this thread feels like the best place to ask:...

    this thread feels like the best place to ask: support for SPI2 on the pin set
    pin 54 - MISO2
    pin 49 - SCK2
    pin50 - MOSI2

    is this impacted if SDIO (42,43,45) is being used? On KurtE's card...
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    22148 I am almost complete with my Teensy 3.5...

    22148
    I am almost complete with my Teensy 3.5 euclidean sequencer for eurorack. Should have the code sorted in a couple of weeks

    I have some code available on GitHub for the stand alone version...
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    @recursinging - very useful, thanks. I saw some...

    @recursinging - very useful, thanks. I saw some discussion on Muff Wiggler and Axoloti forums mentioning the polyend poly, and I see that there is some hope for a stable voltage output and reasonable...
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    well, probably 30 quid after some postage.... but...

    well, probably 30 quid after some postage.... but yes, I take your point, still cheap and very accessible for the DIYer

    that droop rate was interesting. sample and hold on Mutable Instruments...
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    MAX11300 ADC DAC and Teensy

    Hi all,

    does anyone on the forum have practical experience of using the MAX11300 chip as Control Voltage output?

    The MAX11300 chip, particularly the MAX11300PMB1 peripheral module seems to have...
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    Teensy eurorack simple drum module:...

    Teensy eurorack simple drum module:
    https://github.com/mortonkopf/Teensy_simple_drum

    Here is a short video of the drum module with the step divider
    https://www.youtube.com/watch?v=7iTxoKPSAh0
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    Hi Paul, I will put video up in the next day...

    Hi Paul,

    I will put video up in the next day or two and link it from the git repo if that helps. In the meantime: step divider is a utility module, it doesn't produce sound on its own, it takes...
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    for the list: Teensy eurorack Step Divider...

    for the list: Teensy eurorack Step Divider
    https://github.com/mortonkopf/Teensy-eurorack-rotating-step-divider
  20. yes, I have had untold problems with Wordpress...

    yes, I have had untold problems with Wordpress since their update to "blocks", and most of the pages will not now render properly. A major rewrite is needed. I will dig it out and post tomorrow as I...
  21. hi there. Does it still glitch when all...

    hi there. Does it still glitch when all Serial.print comments are removed? There is still one in the file read section that should not be there when in operation. Thats about all I can think of,...
  22. you can use the code in message #381 of this...

    you can use the code in message #381 of this thread with the converter on orchardelica. You should be able to use webpages offline by keeping a copy saved for offline use. That way you don't need to...
  23. to me it looks like red and blue values in the...

    to me it looks like red and blue values in the RGB are switched. You can alter the way that the colours are put back together when they are retrieved from the SD File, and ensure that they are put...
  24. glad that it helps.

    glad that it helps.
  25. hi. you might find the post here useful as it...

    hi. you might find the post here useful as it describes reading a bmp for image display, and later in the thread describes how to use this for light painting. This is useful as it reads one line at a...
  26. you may find that boards is greyed out unless you...

    you may find that boards is greyed out unless you change output mapping mode to "boards of pixels" rather than "single pixels". this is under menu>options>output. but I have not used this option, so...
  27. hi there, I had a look at my Glediator settings...

    hi there, I had a look at my Glediator settings for a project last year using the octoboard, and I had Pixel Order = HL_TL and Board Order = HS_TL. so perhaps your pixel order should be HL_TR and...
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    @misterwilling. glad you got it working with the...

    @misterwilling. glad you got it working with the approach we discussed, it seems like a lot of work at first, but actually makes everything very straight forward and whats more, reuseable for...
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    @nouk, following on from the above post, your led...

    @nouk, following on from the above post, your led reference array would therefore be something like:

    int myled[] = {3,4,5,8,9,10,11,12,20,21,22,23,24,25,26,35,36,...etc};

    you image data is held...
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    Hi, the way to get the led colour from the array...

    Hi, the way to get the led colour from the array of all the pixel data is to imagine the whole frame of pixel data in the buffer as a consecutive list of pixel values, and not to worry about what...
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    personally, I would leave all processing, Jinx...

    personally, I would leave all processing, Jinx and glediator output as standard, and do the pixel shifting at the Teensy end. This way you repurpose the code more easily for different input streams....
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    It looks to be like you could use a led reference...

    It looks to be like you could use a led reference array. This is where you put the led number into an array that can be looped through in the usual plus one loop, but will grab the correct pixel info...
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    does this help:...

    does this help: https://forum.pjrc.com/threads/57153-FastLED-not-compiling-on-Teensy-LC-SysTick-not-defined
    you might have a look to Ensure you have the latest fastled
  34. midi to analogue synth applications (CV out) ?

    midi to analogue synth applications (CV out)

    ?
  35. explore non-blocking ws2811/12 library if using...

    explore non-blocking ws2811/12 library if using less than 600 leds? https://github.com/PaulStoffregen/WS2812Serial
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    for setting the function of the chip, see page 21...

    for setting the function of the chip, see page 21 of the data sheet : IOCON: I/O EXPANDER CONFIGURATION REGISTER
    this sets out why you have the bit settings as described above.
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    hi, datasheet:...

    hi, datasheet: http://ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf



    if you have a read of the GitHub repository for the library https://github.com/sumotoy/gpio_expander
    , read the...
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    good to know that you know which mcp chip is...

    good to know that you know which mcp chip is which re addresses. hopefully you can see which teensy pins are being used for the spi bus, this is going to be crucial in getting the mcp working. on the...
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    I think that you will save yourself a lot of time...

    I think that you will save yourself a lot of time by seeing if the manufacturer will reprogramme the Teensy. Anyhow, can you see from the traces which pins are being used for SPI? it may be there is...
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    It looks like this is going to be a long haul....

    It looks like this is going to be a long haul. your best best is to get used to the serial monitor built in with the Arduino IDE, it makes life very simple when Debugging, as you can insert simple...
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    here is an schematic of the mcp23s17 using inputs...

    here is an schematic of the mcp23s17 using inputs and outputs set and read by the bit read functions
    16945

    you might some reaction from the chips using this code if you know which chip is address...
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    hi there @Gr8guitar. Happy to try and help out, I...

    hi there @Gr8guitar. Happy to try and help out, I am not sure of how familiar you are with the language and the programming environment, the support for these chips is not the easiest to get your...
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    The best course of action is to return for...

    The best course of action is to return for reprogramming
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    these chips have the option to use interrupts, so...

    these chips have the option to use interrupts, so there may have been a set up in code to wait, or it may have been set up to poll. I use Sumotoys library and use polling with the Teensy 3.5, as this...
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    for multiple strips, follow crees direction and...

    for multiple strips, follow crees direction and instantiate fastled for each pin you want: https://github.com/FastLED/FastLED/wiki/Multiple-Controller-Examples


    void setup() {
    ...
  46. Also, MCP23S17 port expanders. These are SPI...

    Also, MCP23S17 port expanders. These are SPI based, and work on a single chain, with each of the MCP chips having a separate hardware address. The chain length is limited to 8 chips. there are so...
  47. well, this is my barebones code: /* *This...

    well, this is my barebones code:


    /*
    *This sketch outputs images to persistence of vision led strips
    *It uses FastLed to drive APA102 leds, sending colour values from
    *arrays held in flash...
  48. @po ting, these look great.

    @po ting, these look great.
  49. @abrownnm - sorry, but I haven't used that...

    @abrownnm - sorry, but I haven't used that abstraction of the poi code so can't help with that. However, have you run your setup with just using the firstlight Fastled example in the examples...
  50. oh, nope, its all cool as is its all for sharing,...

    oh, nope, its all cool as is its all for sharing, but thanks for the offer. It s been a collaborative effort by a lot people on this thread / forum...
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