At the very end I meant 7 bits per 10 milliseconds instead of seconds, so 700bits/second.
For explanation, code and circuit diagram, see https://robberth.github.io/projects/2016/03/29/visible-light-communication/
For a followup video on this topic, see https://www.youtube.com/watch?v=HnUYH1pBIrs
Post time: Jun-16-2017