I think I have found my way to bear in mind the current position of the robot in case of the robot loosing power & not being able to drive itself back to the ZERO. The way is to either use the built in EEPROM(512 bytes), or other external storages which can be connected to Arduino. More info about EEPROM :
The 2nd option is to always send the position to the computer and save it somewhere there at the program(Lots of traffic on serial port, higher risk to encounter problem or missing packages).
Too tiered to fix it now ... Later ...
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