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  1. Advice for expanding midi keyboard /midi accordion i/o pins

    Dear all,

    I intent to change the hardware setup of my midi accordion because I keep getting problems with the setup now.
    The switches are old mechanical switches and work reasonable, but not...
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    Thank you all for the replies. I rewired the...

    Thank you all for the replies.

    I rewired the switches to another matrix. Tested extra pull-up and pull-down resistor options. But still I can't get over 24 Mhz CPU speed without getting rubbish.
    ...
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    Hi Pete, Thank you so much for testing. So...

    Hi Pete,

    Thank you so much for testing.

    So it is a problem with the sketch.

    I take it happened when I altered it for the teensy. I'll build it up from scratch and where I went wrong.
    ...
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    Thank you. You are right. Should be 11 and an...

    Thank you.

    You are right. Should be 11 and an extra comma.

    I made that error in messiing around with options. And I looked over it on copying for thit thread. My apologies. With row 12 and...
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    SbFreddie, Thank you for your answer. The...

    SbFreddie,

    Thank you for your answer.

    The hardware has no power itself. It runs on the power of the Teensy.

    Regards.
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    Constant output on keypad matrix midi

    Hello,

    I've put midi on a accordion with a arduino mega. I've changed to a teensy 4.1 for the native midi on usb.

    Now I have a strange behavior on the keyboard matrix.

    I have a 12 row 4...
  7. Ah. Sorry I misunderstood your comment. Though...

    Ah. Sorry I misunderstood your comment. Though the "that" ment the other guys sensors. Not my keeping the existing.
  8. Found this sensor. ...

    Found this sensor.

    http://omronfs.omron.com/en_US/ecb/products/pdf/en-2smpp-03.pdf

    But still need to amplify and protect against over pressure.
  9. Thank you for your replies!! Why would it be...

    Thank you for your replies!!

    Why would it be easier to remove the existing switches with new one's? Not on the hardware I suppose. The switches Brendan uses are more difficult to place in my...
  10. The physical sensors on the keyboard are quite...

    The physical sensors on the keyboard are quite basic. The instrument used to be an old acoustic/electronic one of the 70's. The electronic part is beyond repair. The old switches with coil springs...
  11. Find my way in all midi covering threads and options

    Hi, quite new to midi and development boards and I'm getting a bit lost with all the information on the internet.

    I want to put "midi" on my accordion. I started this project with the system of...
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