This is cool. Any chance this would scale for many machines? I have a ~15 machine lab with no KVM setup right now, and could really use something like this if it works for a large number of devices.
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I don't think there's a way to get the Pi to capture video or impersonate keyboards for more than one computer at a time.
A neat idea a friend proposed to me was to buy a "dumb" KVM that supports switching through keyboard hotkeys and use that to scale it to multiple machines. See my comment here: https://news.ycombinator.com/item?id=23928251