Hey there peeps i am looking to build a devive similar to that used in the top of the range mercedes models, instead of keys they have a small credit card sized device which the car sees as it aproaches and allows the door to be oppened. Basically i want this for my pc so i can set it up downstairs and when I walk in the door it sends signal upstairs and switches my pc on. Any ideas on how to do this? Thanks in advance. Raptor out.