How to supply Voltage to USB port?

[sisso]

Hello Guys,

Someone please tell me, is it possible to supply external voltage to USB port
and detect this through an application running on the system. or else convert
externally supplied voltage to data and input it to USB so that running application
would detect it.

Please tell me asap........

 

[ronsimpson]

I do not understand. You want to put power into a USB port that is in a PC? That is not normal!

 

[sisso]

Yeah I want to supply voltage to USB port of a PC from an external voltage source. So, that it could be detected like a mouse click.
This is similar to what we can do from LPT port from pin 17.

 

[dougy83]

you need an adapter of some sort, e.g. a USB serial converter (**broken link removed**). You can send the voltage into CTS, DSR or RXD (as a break condition) which can be detected by your program after it opens the serial port. There are also other USB breakout boards available to provide a similar functionality, albeit for a much higher cost.

 

[crutschow]

I agree with dougy83. Many companies make such an adapter (see this).

 

[Shyamal]

I'm agree with ronsimpson
This is not possible.

 

[Shyamal]

I also need this circuit

 

[dougy83]

I also need this circuit

Which one? The one that's not possible or the other one? The other one is being being followed up by sisso on this thread: https://www.electro-tech-online.com/threads/how-to-design-a-comparator.119383/#post984953

 

[Shyamal]

USB supply voltage is 5 volt?

 

[dougy83]

Supply is 5V, data signalling at 3.3V. See: https://www.beyondlogic.org/usbnutshell/usb2.shtml