I attached a wifi-shield to my arduino uno r3. I noticed the wifi-shield power pins had a 5 volt pin. I am assuming the 5 volt pin on the wifi-shield could be used to power 5 volt objects. I connect a 28BYJ - 48 5V Arduino Stepper Motor to the wifi shield using a motor driver. The motor just vibrates but the knob doesn't turn. I was wondering why the wifi shield can't power a 5 volt motor using the 5 volt pin.