Can we use devices through brain?

Definitely yes sir, using devices through hands alone without thinking or using your brain is like a form without substance.

Yes, absolutely. You are using your brain to control your hand which in turn, controls the devices. Ultimately, its your brain that is controlling the devices.

However if you intend to skip the involvement of hand, you need to tap into the brains neurotransmitter impulses and develop device that perform specified task in response to these impulses.

You can visit http://www.hongkiat.com/blog/brain-controlled-gadgets/ to look at some cool devices that are under development or already developed based on your concept.

Anything is possible. More than that I have a strong belief that moving things and using devices using your brain is completely possible. You only need to find a way.