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I'm having issues with the Ardumoto shield. I want to use a motor at 5V with a 12V 2A power supply connected to the Arduino board.
From my understanding, the ardumoto shield gets its power directly from the Vin pin. How am I supposed to reduce the voltage for the motor? Also, should I worry about the big amperage coming in from the power supply?
Thank you for your help.
Your best bet is to drive the tiny motor directly with a darlington transistor like the BC517 and 5V, or make 6V and drive it off that. The motor shield is simply overkill for this. Just make sure you dont stall it - the shortcut current in this setup might be to high. Do not forget to add a flyback diode antiparallel with the motor in this setup.
You might put a resistor in series with the motor.
A voltage divider in front of the motor will not work, because the lower part of it is parallel to the shield or motor.
