Knobbox: Modal USB knob

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Control volume, brightness, temperature, and more with a single knob.

spro

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Mystery of the 3/4 plug
11/14/2015 at 09:49 • 4 comments

I'm trying to debug the ATTiny85 version and I've found how to make it work 100% of the time, but it's a weird ritual and I'm not sure why it works.
If I plug in the USB cable 3/4 of the way, it connects perfectly. If I plug it in all the way, the USB device fails to enumerate.
My research so far tells me the most likely cause is a calibration failure. But given the scenario above, what could cause it to miscalibrate only when fully plugged in?