I Make Projects writes –
Amaze your friend(s) and terrify your enemies by granting yourself the ability to supernaturally sense wireless network hotspots! (Well, apparently supernaturally, anyway.) You will easily and quite literally “feel” wireless access points in the vicinity and automatically sense their signal strength as easily as you feel the wind on your cheek. All you need is a few parts and some careful electronics work.
Give yourself a sixth sense for wireless networks – Link.