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  1. Will common small electret mics work with the audio shield?

    Hi!

    I see the pjrc shop offers a mic that fits the audio board (3.x). Would any other electret mic work, for example this one?

    https://www.electrokit.com/produkt/electret-mikrofon-o9-7-x-6-7mm/...
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    Just wanted to share the new demo song I made for...

    Just wanted to share the new demo song I made for the Roland MKS-50 and my controller.
    No eq or other effects were added post recording. Just some compression on the master.

    Enjoy!

    ...
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    Ah, I see. Maybe they have changed policy or I...

    Ah, I see. Maybe they have changed policy or I was lucky. But sure, feel free to reference my project. I will PM you Jelvin's email address.
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    Hi, I'm happy to hear that you are about to build...

    Hi, I'm happy to hear that you are about to build an MKS-50 controller based on mine!

    That does not sound like Takachi at all. My contact, Jelvin Lim was very helpful and helped me to provide them...
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    Thank you, NotoYota. It was designed in Adobe...

    Thank you, NotoYota. It was designed in Adobe Illustrator and sent to Takachi Enclosure in Japan for printing and punch pressing on one of their aluminum enclosures.

    The .ai-files and other docs...
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    I finally took the time to put together some...

    I finally took the time to put together some schematics for this project, which can be found here:...
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    Hi! If it actually changes on the MKS-50...

    Hi!

    If it actually changes on the MKS-50 screen then I don't know. I looked at Ctrlr when adding the Poly/Mono switch, which means that (as you probably already know) instead of "real" monophonic...
  8. Have you selected your Teensy model in the Tools...

    Have you selected your Teensy model in the Tools -> Board menu?
  9. Sorry. No, I've left it out and it did work...

    Sorry. No, I've left it out and it did work anyway. If you experience jittery readings I guess you could try and add it. For a more technical and correct answer, someone with more experience might...
  10. I'm not 100% sure if it works since I went on...

    I'm not 100% sure if it works since I went on using the "T" version for my real projects after this, just to be on the safe side. But I think the code should work. You might need to adjust the delay...
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    Hmm, don't know about the version of the MIDI...

    Hmm, don't know about the version of the MIDI lib. I'm using the one that shipped with Teensyduino when I downloaded it in January. I didn't have to enable it as far as I can remember. It just worked.
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    The resistors for the MIDI in circuit should be...

    The resistors for the MIDI in circuit should be the same for 5V and 3.3V. The soft thru should be active by default so if you get MIDI in working you should be good to go. I've used the PC900 exactly...
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    Finally got my MKS-50 back from service! Updated...

    Finally got my MKS-50 back from service!
    Updated original post with link to live demo video:

    https://youtu.be/3QjlO-yeFrc
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    @adrian I've put a link to the source code at the...

    @adrian I've put a link to the source code at the bottom of my original post. I've added some comments and removed some unused stuff. I hope it's readable :)
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    @Paul Thank you! I did my best. I will really...

    @Paul Thank you! I did my best. I will really consider designing a separate pcb for the controls next time :)

    @adrian I promise I'll post the code as soon as I get the MKS-50 back from service. I...
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    Ah, I just forgot that I actually did a recording...

    Ah, I just forgot that I actually did a recording of it in action before leaving it for service. No closeup on the panel though and just recorded with an iPhone. I would like to do a proper...
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    Thank you! I'm using five 74HCT4051, for the...

    Thank you!

    I'm using five 74HCT4051, for the analog inputs. The seven digital inputs are connected directly to their own pins. I would like to publish the code, but I think it needs some...
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    Completed MKS-50 MIDI controller/programmer

    Hi, just wanted to share this project that I completed a while ago. This is my first Teensy based project and I've only completed a couple of preprinted DIY eurorack modules before so I'm quite happy...
  19. MIDI-controlled 2A03 (NES) chip using Teensy

    I'm thinking of making the 2A03 controllable via MIDI by using the tutorial found in these two blog post:

    http://shiftmore.blogspot.se/2012/11/arduino-controlled-nes-2a03-synth-part-i.html...
  20. Creating arbitrary waveforms from single cycle waveform

    How are you creating your arbitrary waveforms? I would like to try out AdventureKid's NES single cycle samples in the teensy, but they are 600 samples long. Any good tools out there to downsample a...
  21. Hi, I've got a follow up question on this. I...

    Hi, I've got a follow up question on this.

    I just completed my midi controller with some knobs and buttons and midi in/out. I left out the capacitor in the midi in circuit since I suspected it...
  22. The MIDI library has soft-through enabled by...

    The MIDI library has soft-through enabled by default, so when you call MIDI.read() it will pass any new messages to MIDI out automatically.
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    Thank you, luckily Electrokit in Sweden just...

    Thank you, luckily Electrokit in Sweden just added N25Q128A to their site, so I will try that out.
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    I am already using the audio shield. Is there a...

    I am already using the audio shield. Is there a list of supported SOIC-8 flash's? The one specified on the audio adaptor board page (W25Q128FV) is not available at any of the web stores here in...
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    Wait, now I feel dumb. I thought that the teensy...

    Wait, now I feel dumb. I thought that the teensy had a flash memory mounted by default. I guess that's not the case.
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    I run the EraseEverything sketch and get the...

    I run the EraseEverything sketch and get the following output:



    Flash Memory has 1048576 bytes.
    Erasing ALL Flash Memory:
    estimated wait: 3 seconds.
    Yes, full chip erase is SLOW!
    Erase...
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    Seems like it hangs when doing...

    Seems like it hangs when doing "SerialFlash.exists(filename)". Trying to print anything inside if statement or after doesn't do anything.
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    Problem copying file to serial flash

    I'm trying to copy a file (707.RAW) to flash. I've formatted the SD card to FAT on OSX and when running the CopyFromSD sketch it prints "707.RAW 122074" and after that nothing happens. How long is...
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    Sorry, don't know how I could miss that.

    Sorry, don't know how I could miss that.
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    Modulated filter frequency

    I read through the audio library roadmap, but could not find any sign of modulating a filter's frequency with other components. Usually, when playing a synth, I find myself more commonly modulating...
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    Thank you for the clarification. I will...

    Thank you for the clarification. I will definately stick with the pc900 then.
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    6N138 as replacement for PC900

    I'm trying to implement MIDI in and replacing the PC900 with a 6N138. I'm wondering if this is a good choice and what the circuit diagram would look like. Resistor values etc. I've read some posts...
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    If you connect one of the outer terminals of the...

    If you connect one of the outer terminals of the pot to 3.3V and the other outer terminal to ground, then the wiper should range from 0-1023 by default
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    Yes I considered MidiOx, but it seems to be...

    Yes I considered MidiOx, but it seems to be Windows only.
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    You are right! At last I'm getting valid...

    You are right! At last I'm getting valid messages. Thank you! I find it confusing that a software called "Midi monitor" fails to read all sorts of standard messages. Hopefully my Roland MKS-50 can...
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    I finally got it sending data. I had the midi...

    I finally got it sending data. I had the midi jack facing the wrong way (I interpreted the diagram as if the front was facing upwards). Now I get Midi Monitor to recieve the messages, but it tells me...
  37. No problem, thanks for your help :)

    No problem, thanks for your help :)
  38. Did you get it to work, xox07? Just curious, how...

    Did you get it to work, xox07? Just curious, how are you planning to build that case/panel? I'm also working on a MIDI controller but haven't found any good solution for the panel printing and...
  39. Is "Y" in the first row representing the previous...

    Is "Y" in the first row representing the previous 8-bit value?
    Could you please explain how this works or link to a resource? I know what bitshifting is but I'm not familiar of how to use it.
    ...
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    One thing crossed my mind. The midi specification...

    One thing crossed my mind. The midi specification uses 5V. The tx1 on the teensy 3.2 is at 3.3V. I haven't found any info on what voltage the earlier versions of teensy are using on the tx pins but I...
  41. Great. Are there any drawbacks when using the...

    Great. Are there any drawbacks when using the 3.3V pin?
  42. No, it's "HC", as in the MIDI example. I changed...

    No, it's "HC", as in the MIDI example. I changed to using the 3.3V output pin instead.
  43. Thank you very much for the great explanation!...

    Thank you very much for the great explanation! I'll play around with the values ans see if I can lower the delay.

    I'll also try the digital low pass filtering to see if that helps,...
  44. Yes it's 0.1 uF :) That makes sense. Tried to...

    Yes it's 0.1 uF :) That makes sense. Tried to increase delay and it behaves more reliably now, I guess I should have included an image in the first place.

    How do I calculate how large capacitor is...
  45. If It turns out that the 74HC4051 is not the...

    If It turns out that the 74HC4051 is not the right tool for this, is there another way to expand the number of inputs of the teensy?
  46. Heres a picture of my breadboard. 6019

    Heres a picture of my breadboard.
    6019
  47. It's the 3.2 teensy. The reason for using the...

    It's the 3.2 teensy. The reason for using the 74HC4051 is that I'm planning to create a midi controller with around 50 pots and buttons, but I'm trying to get comfortable with the components first.
    ...
  48. Potentiometers affecting each others when connected to 74HC4051

    I'm trying to implement a small scale version of this circuit https://www.pjrc.com/teensy/schematic_ioexpand.png
    I'm using one 74HC4051 and two linear 10k pots. The output of the 74HC4051 is fed to...
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    That makes sense. Thank you.

    That makes sense. Thank you.
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    Thank you, it works perfectly! Now I can see the...

    Thank you, it works perfectly! Now I can see the value changing while I turn the potentiometer.

    Just curious, will this create memory leaks? I am creating new static array every time. Should I...
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