Espruino WiFi with Adafruit Micro-SD Breakout board

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  • Hello,

    I'm experiencing the exact issue as this post:­315054/

    Unable to mount media : NOT_READY

    It worked one time only between a lot of trials without changing any thing.
    I'm using a new 16GB micro-sd card formatted to FAT32 and works fine on windows 10.

    All the connections and power are OK.

    CS => B1
    DI => A7
    DO => A6
    CLK => A5
    GND => -
    3v => 3.3v

    Timeout of 3 seconds between:

    SPI1.setup({sck: A5, miso: A6, mosi: A7});
        E.connectSDCard(SPI1, B1);



    I also tried a pullup resistor on pin B1 I don't know if I did it right:

    pinMode(B1, 'input_pullup');

    I'm using Espruino WiFi with firmware 2v08.

    Do I need to connect CD pin somewhere too?

    All I need is stable initialization when powering up espruino wifi.

    I planning to use the button for E.unmountSD(); before powering off.

    Thank you.

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    • IMG_20201209_031029.jpg
  • Have you tried it with another card, just in case? And is your Espruino Wifi firmware up to date?

    You might be hitting issues with Adafruit's adaptor because it has a level converter on it. It's set up to convert 3.3v signals to 5v, but Espruino WiFi is 3.3v too. You don't have to worry about CD at all though.

    Adding a physical pullup resistor (10k?) between CS (B1) and 3.3v could be a good idea though. I'm afraid the internal pullup won't cut it, since at power on your code won't have executed, so it will still be floating for a while.

    What you'be done looks like it'd be fine, but you could also try disconnecting the wire you have for 3.3v and connecting 5v to Espruino WiFi's VUSB (right next to 3.3v on the WiFi board). As I understand it the module has its own 3.3v regulator and you can just use that instead.

    The other thing is Adadfruit's docs mention long wires being a problem, and so if none of the above work you could potentially get rid of all the wires, use software SPI, and push the SD card adaptor in right next to Espruino WiFi on pins B1/B10/B13/B14/B15 - with GND/3v/5v hanging over the edge so you can connect power properly:

    var spi = new SPI();
    spi.setup({mosi:B13, miso:B14, sck:B15});
    E.connectSDCard(spi, B10);
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Espruino WiFi with Adafruit Micro-SD Breakout board

Posted by Avatar for michael_101 @michael_101