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Thread: Using Teensy for big MIDI control surface

  1. #26
    Senior Member BriComp's Avatar
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    mcp23017s
    Only I2C versions seem to be available at the moment, at least until 2023.

  2. #27
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    Your'e welcome.
    Make sure to get a MCP23S17 which is the SPI version. The MCP23017 are I2C which is slower.

  3. #28
    Senior Member BriComp's Avatar
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    Quote Originally Posted by luni View Post
    Your'e welcome.
    Make sure to get a MCP23S17 which is the SPI version. The MCP23017 are I2C which is slower.
    Have to wait until 2023 then. See my post above.

  4. #29
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    OK, thanks BriComp and Luni for the advice.
    I shall be careful when ordering
    thanks

  5. #30
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    Quote Originally Posted by BriComp View Post
    Only I2C versions seem to be available at the moment, at least until 2023.
    Oh, that's bad. I assume you checked all the usual sources... Just saw RSComponents has 3 on Stock but a MOQ of 5 :-))

  6. #31
    Senior Member BriComp's Avatar
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    Couldn't see any in stock on RS UK, though they are available on back order in the DIP package for delivery 27/6/2022.
    Minimum order size 15 pieces.

  7. #32
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    Just had a look at Octopart. There are plenty at "unsusal" suppliers. https://octopart.com/search?q=mcp23S...n_stock_only=1 (click on "show all" below the standard distributor list)

  8. #33
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    Quote Originally Posted by BriComp View Post
    Couldn't see any in stock on RS UK, though they are available on back order in the DIP package for delivery 27/6/2022.
    Minimum order size 15 pieces.
    Thank for the advice to all

  9. #34
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    Referring to your first post, you asked about using a master Teensy communicating with a number of Teensy slaves. Can be done using usbHost port (T3.6 0r later) for master, plug in a usb Hub then plug Teensy slaves, configured as usb devices into the hub.

    Found the schematic of 32 encs with 4067s, am happy to post here if helpful.
    Here is a link to more or less the basis of my project.

    https://forum.pjrc.com/threads/59485...ht=encodertool

    Rather dated, has evolved heaps. Started life as a portable Teensy-Midi devkit.

    Still using the same board but with a mess of wires "breaking" a T3.6 into the (fully pinned)T3.2s socket. Metalwork is ready for V2. Soon to begin assembly of new board using T4.1.

    Thinking of a Blog Project submission or something when V2 is up and running, will be some months. Busy preparing for rainy winter days ahead.

    @luni, perhaps EncoderTool needs it's own thread, don't want to highjack this one, have an idea for a new setter.

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