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Teensy WIZ820io & Micro SD Card Adaptor Rev 2

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  • Teensy WIZ820io & Micro SD Card Adaptor Rev 2

    This adaptor allows you to easily use gigabytes of SD card flash memory and/or a Wiznet WIZ850io or WIZ820io ethernet module with Teensy LC, 3.0, 3.1, 3.2, 3.5 and 3.6.

    The Teensy is a breadboard-friendly development board with loads of features in a, well, teensy package.

    WIZ820io requires a reset pulse to function properly. WIZ850io is more tolerant of startup without reset, but a pulse on the reset pin is absolutely required for the older WIZ820io modules.

    This adaptor has a CAT811T reset chip to automatically pulse reset at powerup. However, after uploading a new program, your WIZ820io may be left in a prior state depending on where your prior program stopped. Pin 9 should be used to manually trigger the reset pulse for best compatibility with WIZ820io and W5200 chips. See the initialization code below for an example.


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