What are you actually using the Arduino for?
If you are not using it as controler but only as power source (which your diagram suggests), you’d be better off powering the Core directly off a 5V/2A wall wart or such and power the scanner off the Vin pin of the Core (unless its max current draw is greater than 100mA).
If it’s more than 100mA, you might have to power the Core and scanner in parallel off the wall wart (into Vin of the Core).
Before going into the “corrupted” data in the other thread, you’ll have to get the power sorted, since inadequate power setup might be causing the corruption.