The Vin pin allows for unregulated power to be applied to the board. It is the same electrical connection as the DC Plug.
For what it is worth, you'd get far more time from some AAs than a 9v. The 9v has a very low current capacity.
The Vin pin allows for unregulated power to be applied to the board. It is the same electrical connection as the DC Plug.
For what it is worth, you'd get far more time from some AAs than a 9v. The 9v has a very low current capacity.