I just bought a wifi module shield and using it with Arduino. I power Arduino (with the wifi shield on it) via USB from the PC. I need to demonstrate it without using the PC as a power supply. And I cannot also use 2.1 power plug or 9V adapter jack since i don't have that component. I don't have time even to buy that.
So the only option for me is to use the Vin pin with a 9V battery. I am just afraid if i may damage the wifi shield or Arduino. I read some warnrnings about that.
Is the Vin pin used only with Arduino without a shield on it?
Thanks in advance,