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> Which is good for ~30 Baud and distances of inches at best.

This feels like it would be part of the plot of a Neal Stephenson or Andy Weir book.

Our intrepid hero has to send super secret plans to save humanity through glass to his partner, so they can prevent Jupiter going supernova! But the Bad Guys are jamming wifi signals!



As a university project I created a Morse code transmitter and receiver circuit that used the same type of LED on both sides. It worked pretty well up to a few inches apart.




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