Jim posted a clever hack on the Workshop 88 slack workgroup recently. Here was his description:
One of the limitations of working with the dear old AT Tiny85 is that it has no UART. Yeah, we’ve all debugged stuff with an LED or 2, but how about this: Use an old phone as a serial terminal!My old (2 or 3 phones back) phone supports OTG. I plugged a USB-serial adapter in, ran up the nice Serial USB Terminal by Kai Morich, and ran Tiny Serial Debug (write-only bit bang serial). And it works! That terminal supports CP210X, CH340G, FT232, Arduinos with 32U4 and more. And it only costs one pin (plus ground)!
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