Computer Detects if User is Away and Auto Turns of Monitor to save Energy
March 6, 2010 | Filed under Software;
It has been proven that by simply turning off your computer screen, it can save a lot of power. Torrent downloaders that leaves their computer turned on 24 hours a day should already know this fact and do the following. Humans are flawed and forgetful which makes us sometimes forget to turn off the screen unintentionally. Wouldn’t it be better if the computer actually knew when you were at the computer and when you have left?
This is now made possible as long as your computer has a microphone and a speaker. Well this two hardware are mostly made available in modern laptops including the all-in-one desktops. The Sonar Power Manager uses a new user presence detection technique to shut off the computer display when you are not present. It was developed by researchers at Northwestern University and University of Michigan. The goal is to shut off the screen immediately after you leave, even if you just moved the mouse 10 seconds ago.
It uses a very simple type of sonar system to accomplish this:
The Sonar Power Manager uses ultrasonics (sound above 20kHz in frequency and which humans cannot hear) on your computer’s regular sound system. For these unlucky users, the Sonar Power Manager will not properly detect user presence. Other unlucky users will find that their speakers produce annoying lower-frequency harmonics or noise while the sonar is operating. SonarPM runs on Windows 2000, XP, Vista and 7. Linux is also supported although you need to manually recompile from source.