Agree on board but just the ttl levels outside? even it’s only 2 meters?
I know i’m maybe a bit skeptic but in our business everything has to be ready for heavy testing and homologations.
But maybe i’m not really qualified in this, electronics is not really my core skill
@ David@ Emrol - As usual, there is not an easy way to do it right. 
Note that there are TTL level protocols that are capable of long(er) distance communication, such as Dallas/Maxim’s OneWire protocol.
I have a question if I should use different protocol, but I started a new thread (different problem, different thread).
http://www.tinyclr.com/forum/topic?id=11137