We previously made a jerry-rigged USB Host Wing (https://www.adafruit.com/product/5858) tester based on an ESP32-S2 TFT board (https://www.adafruit.com/product/5300) and a pogo-pin (https://www.adafruit.com/product/394) filled Feather Doubler (https://www.adafruit.com/product/2890) - but for final testing of hundreds of boards off a panel, a nice custom-made PCB is better. This one uses a Metro M0 since our SAMD21 board support package has TinyUSB support - so we can verify if we enumerate the connected USB peripheral. If a vid/pid is found, we're good to go, and beep and blink to indicate the test has passed.

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