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• 23:40, 15 June 2024 Helpful talk contribs created page USB host shield (Created page with "<!-- The Arduino USB host shield is based on the MAX3421E, which is controlled via SPI, (and has some general-purpose input and output pins, exposed so that you can use them) The MAX3421E is 3.3V device, as the USB data lines are 3.3V differential. I'm guessing the buffer chips on the board make it tolerate 5V. USB's voltage lines are 5V. : Self-powered devices barely care about these lines, meaning you can get away wiring VBus to 3.3V. : For bus-powered devices yo...")