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A comment on Building the worlds jankiest serial to USB cable from scavenged parts. Parent comment

Re:Building the worlds jankiest serial to USB cable from sca... by magnat on Tuesday March 07, 2023 @08:35AM (#35055140)
You can actually bit-bang low speed USB on Arduino [0]. There is even a bootloader [1] for ATtiny visible to host as HID USB device. It is obviously not compatible with Arduino, but those tiny boards look too cute to ignore [2]. Also, you can use USB port both for downloading firmware and your application.

[0] https://github.com/obdev/v-usb

[1] https://github.com/micronucleus/micronucleus

[2] https://cpldcpu.wordpress.com/2014/04/25/the-nanite-85/

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