kung 6V yung motor, apat na 1.5V batteries (1.5Vx4 = 6V).
Puwede rin kumuha ng 6V from a 9V or 12V battery using regulator chip (ex. LM7806).
Baka masyado mahina yung signal na galing sa Arduino, baka kailangan ng motor driver.
Or use transistor as a switch.
Ex. NPN transistor with 1k resistor sa base, yung resistor naka connect sa output pin ng arduino.
If you are using a different power source between arduino and motor, kailangan lahat ng ground connected.