This guy made a door-activated sensor that instantly switches whatever is on his computer display to the file manager

'Made it with python, Arduino and a homemade proximity sensor. A literal life saver.' That's what this clever tinkerer says of his handcrafted display-switching contraption.

It sounds useful. For instance, if you're watching a Harold Lloyd movie but are rightly reluctant for anyone to find out you enjoy such garbage, you can configure it to switch to a Buster Keaton film as soon as someone enters the room, preserving the illusion that you are a person of taste. — Read the rest