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    Periodic click when saving ADC input to SD card

    Perhaps I missed it but is this click consistent across different micro sd cards?
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    is there a usb hub that allows me to connect and disconnect without screwing up windows

    Ah! I missed the statement in the parens. Ignore my idea.
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    is there a usb hub that allows me to connect and disconnect without screwing up windows

    Sabrent sells a four port USB 3.0 hub that has buttons on the top to control disconnect and reconnecting of that device. Not sure if Windows will go crazy but Linux does not.
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    Increase RAM1 Size

    Without doing a deep dive into your code, I would recommend you use the constexpr keyword on your variables that will never change during runtime. The keyword marks them as const for runtime but also tells the compiler that it can do more analysis of it to give you better diagnostics and also...
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    Teensy 4.1 and MCP23S17 question

    So I have done this before with a display, multiple MCP23S17s, and eight psram chips all on the same SPI bus (it was on an ATMEGA1284p but the idea still works). What you're describing is why there are beginTransaction and endTransaction functions you wrap your SPI transactions with. That way...
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