alphabet soup

night session with @sqrt2 and @club-mate :)

blinkenwall.com needs to be fixed. A blown shiftbrite has been discovered, already replaced and the cabling improved. During realization of an idea to isolate all signals coming from Arduino we had to learn that the optocoupler we used aren't fast enough. The labs mixed-signal oscilloscope came in handy - it would be hard to detecting a incomplete, complex datagram by other means.

Next step: get some faster photodiode opto-isolators, instead of a phototransistor comprising type like our CNY17-3 from Metalab small parts store.