I’m looking for a clever way to lock my Windows PC rightaway when I leave my desk. Most of the times I remember to hit Win-L, but sometimes I don’t. I did set a 2-minute timeout, but my workmate in the office next door noticed and immediately rushes to my office to flip my screen or other such stupid jokes when I’m clear away.
So, aside from getting mad at him - which I’m not gonna do, because I like him and it’s a kind of game we play, the obvious solution is to install a switch on my desk chair (which is spring loaded): take the weight off the chair, switch goes off, PC locks. But that’s too easy and not very grinder-like.
So I have a better idea: weave a copper wire into the fabric of my chair to form a flat coil antenna, and implant a transponder in my butt. Not only will it lock the computer when I get off the chair, it’ll also unlock it immediately when I sit back down. I won’t even have to present my hand to the reader under my desk anymore. Genius!
Trouble is, I don’t always sit exactly at the same place all the time. So the antenna would have to be a lot more forgiving with transponder placement than regular readers. Ideally, I’d like to reuse the electronics of some existing el-cheapo USB reader too, so I don’t have to roll my own. But I have a feeling a wide antenna will make a wider, but also weaker field, and that won’t work so well.
Anybody has good pointers on RFID antenna designs for that kind of requirements (as I’d probably go LF to increase chances of this working)? I’ve googled around, but nothing very useful came up…