dekuNukem has created a great system for keeping track of how long you spend playing games working hard in front of your computer screen. He’s taken a Pi camera module, which is focused on the computer user and a Raspberry Pi which compares the image coming from the camera with a still of your face that you’ve previously taken. The Pi then records a counter of how long you’ve been sitting there over the past day and week. He’s added an OLED to show the counters on a piece of prototyping board. The system is called FacePunch – because you’re using your face to “punch the clock”! The whole project is documented over on GitHub.