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USB HID Commands

post #1 of 7
5/27/12 at 6:10pm
Thread Starter 
I'm working on this simple usb device as a first step to something more complex.

Basically it has one button and when you press the button the primary monitor goes into standby.
I would like it to work for both Windows and Linux.

I'm still researching, but does anyone know if there is an HID command that can do that.
If I have to have a program do it then the idea is a bust. It has to be a recognized command as part of HID compliance.
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post #2 of 7
6/1/12 at 2:02pm
There isnt a HID command to do that.

Basically all you get out of HID (unless you want to write drivers) is Keyboard, Mouse and Gamepad(Joystick). If what you are trying to do cant be done via one of those devices, its not possible.
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post #3 of 7
6/1/12 at 11:07pm
Surely could could chip the USB to be recognized as a keyboard / mouse. Might need to sacrifice some keyboards as an experiment though wink.gif
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post #4 of 7
6/2/12 at 4:09am
Quote:
Originally Posted by GreddyGo View Post

Surely could could chip the USB to be recognized as a keyboard / mouse. Might need to sacrifice some keyboards as an experiment though wink.gif

It's easy enough to get a custom USB device to be recognised as a keyboard. The point it that there is no native instruction to switch the monitor off. You might be able to put the whole PC to sleep though by emulating the sleep button.
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post #5 of 7
6/2/12 at 2:30pm
Thread Starter 
Quote:
Originally Posted by ARandomOWl View Post

It's easy enough to get a custom USB device to be recognised as a keyboard. The point it that there is no native instruction to switch the monitor off. You might be able to put the whole PC to sleep though by emulating the sleep button.
Thanks, I was thinking about this. The original idea was a sensor that can detect a person and turn on/off the monitor based on that. I've decided to move to my second idea, which is more interesting. A working pip-boy mapping device! thumb.gif
Sorry, no radiation or anything else, just mapping. wink.gif
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post #6 of 7
6/2/12 at 2:59pm
That's a good idea. The software to make it work shouldn't be too hard to implement. I might have a go at this as a future project smile.gif
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post #7 of 7
6/6/12 at 5:16am
Quote:
Originally Posted by ShamrockMan View Post

There isnt a HID command to do that.
Basically all you get out of HID (unless you want to write drivers) is Keyboard, Mouse and Gamepad(Joystick). If what you are trying to do cant be done via one of those devices, its not possible.

It can though. There are keyboard shortcuts to turn the screen off in Windows (thanks to MS epically breaking ACPI). As for Linux, well that would depend on the desktop environment / window manager and it's configuration.

The safest way would be to write device drivers though
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