31 Mar '15, 5am

Chinese Whispers For Arduino

OK, gremlins and neutrinos are amusing, but hopefully no one thinks either of those are a realistic cause. Unshielded wire would almost never cause a bit error in a large-swing signal like this – especially not over such a short distance. I mean, a short bit of wire is a crappy antenna, and if you’ve got electric fields with what, 10 V/m around your workbench, I guarantee you’re going to have bigger problems than this (like the Arduino inputs dying). What is a much, much, much bigger problem is the fact that there’s no return for the transmit/receive signals, except through the breadboard. Remember, current flows in a loop. Always. So when that serial line switches from “low” to “high”, that high-frequency current needs to return back to its source somehow: and the only path it has to do that is to go through the breadboard, back to the other Arduino: resulting in a very h...

Full article: http://hackaday.com/2015/03/30/chinese-whispers-for-arduino/

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