Control smartthings with computer?

Something’s are already there and needs no additional “Smarts”. PCs have a very robust power management system. You could simply tell the PC to turn off the monitors in 10 minutes of no activity. They will automatically turn back on with a keyboard stroke or mouse movement…

I use EventGhost to control various things on my PCs via SmartThings. The biggest plus is to turn my PCs off and keep track of their status. I even have Virtual Switches that follows when the PCs are active or not.

Here’s a tutorial: