Whenever you're involving a power hungry device in your project it's likely that it will create enough surge or drain in the rest of the circuit to make things act goofy. For your sanity you should use an external power supply.
Whenever you're involving a power hungry device in your project it's likely that it will create enough surge or drain in the rest of the circuit to make things act goofy. For your sanity you should use an external power supply.