News for hackers. Stuff that matters.

A comment on With a simple piece of paper, engineers create self-powered, wireless keyboard. Parent comment

Re:With a simple piece of paper, engineers create self-power... by cgriswald on Monday September 07, 2020 @02:32AM (#24397075)
It could probably be done now just by looking at hand shapes and if you’re a touch typist you might not even need the projection, just a dot or two (which could just be stickers on a surface) to orientate your hands over nothing.
[ Parent | on HN ]
Re:With a simple piece of paper, engineers create self-power... by freeone3000 on Tuesday September 08, 2020 @11:58AM (#24409659)
Hand shapes for typing are far from standardized or recognisable. Nowhere near the accuracy a laser beam break gives you. (The projection LED is separate from the detection laser, which is much lower power)
[ Parent | on HN ]