Thanks for all. First thing - it is not "student home asignment" :) And time more critical then 14 days from 365 :))))))))

Modules shouldn,t be removed while aplication is working. I2C is too slow.

I have plenty of free pins :) it is not problem. Data transfier rate should be not less then 10kbit/s and different modules must have different priority for bus control...

It looks like, my oun bus should be worked out...