Raspberry Pis 3.3v Arduinos USB to 3.3V TTL serial adapters. Tested with CP2102 module. If you just want to write to the sign, i.e. you don't care about receiving from the sign, the circuit is very ...

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@snarpatroid what are you running at present? You shouldn't ever need to open the case, I'm happy to try and clean this thread up at some point. I'm using an ftdi cable that I used for something else, ...