[playbox12]

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Originally Posted by Sinner You could place sensors at your door posts that signal when your doors are open (Normally Open sensors give a signal when the beam is interrupted). Then connect them to a µProcessor as a medium, the controller can communicate with your computer. Same for belt buckles. You can write a program in almost any language (I did it in C for my engineering project) that intercepts these signals and does something with it (e.g. telling you your doors are open). If you don't have any experience with microprocessor programming or electrical circuits I wouldn't start on it.

Well you've got to earn your experience somewhere, this might aswell be a good way to start despite the fact it can get a little complicated, there are tons of tutorials on the internet that will help in achieving the task step by step. (tutorials on processing data outputted by microcontrollers, but also on using sensors in combination with).