QT Py USB Host BFF Tests a Trinkey
51our popular USB Host FeatherWing (https://www.adafruit.com/product/5858) lets anyone with a Feather board add USB Host support via the MAX3421E (https://www.digikey.com/en/products/detail/analog-devices-inc-maxim-integrated/MAX3421EETJ-T/1455883) chip - a tried and true SPI-to-USB converter. here's a tinified version, that fits on the back of any QT Py or Xiao board. use SPI plus a CS and IRQ pin and you're ready to rock. theres tinyUSB support for me MAX3421 chip (https://github.com/hathach/tinyusb/issues/2001) for Arduino which means its trivial to connect to a USB keyboard, mouse, storage key, or a USB serial device like this Trinkey! We're using our SHT45 Trinkey (https://www.adafruit.com/product/5896) as a demo board since its an easy way to quickly verify enumeration and data transfer. since the BFF/QTPy form-factor is too small for a proper USB Type A, we're going with a micro B, you can just an OTG adapter to turn it into a full size A (https://www.adafruit.com/product/1099)
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