ok Paul thanks for your tips i store all values on SD without strings.
the other problem is that the I2C will not work. when i look the signals on the Arduino board
A4 and A5 with the scope, it seems like the ports are not configured as output.
without Slaves the Port's changes when i touch only with the fingers.
I tryed with Pullup, Pulldown resistances, no change.
the board is an Arduino UNO with Atmega 328.