When you have code running on a computer without access to a software development environment or even a serial channel, you have to accept limited access to what is going on. The software tool I am offering lets me transmit a four-bit value in 100 milliseconds. Much faster speeds are possible.
The only necessary hardware is a smartphone.
If you are interested, please see
https://rick.sparber.org/OpticalBasedDebuggingTool.pdf
Your comments are welcome. All of us are smarter than any one of us.
Thanks,
Rick
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