How to make a USB connection on/off

[mr_76]

Hi all,

i'm a newbie in this field and i'm wondering if exist some way to control power flux of a USB connection: i mean i have
a USB device powered from the PC usb port, and i want to have the possibility to cut off the power to the device together with same button that shutdown other components, i don't know how this is called.:shock:

Thanks in advance.

 

[pradeep.g.belchada]

usb is powered internally through 5v . u should refer to usb manual , add a switch in between usb port to on/off



found usefull press helped me button

 

[mr_76]

Yes... Perhaps i was not so clear in asking for it.
What i mean is i already have a spst button with which i power cycle my instrument's electronics, so i'm wondering if exist some opto coupled device that basing on the same button can attach/detach usb power flow in the usb cable 8-O