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Jethro that Arduino board will operate from 12v just fine. Its input voltage should be between 5-12v. (It's regulated on the arduino pcb).
It's logic level is 5v. Which means its output signal to the pins is 5v. Which is neither here nor there when operating that stepper.
So just connect to a 12v battery/ power source and you will be fine.
The stepper will also run off 12v but they run hot. So if you can best option is a pack of 4x aa batteries running the system. This gives you 6v which is enough for both stepper and arduino without having to worry about dropping the voltage. (one less thing you need to do).
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