HOW TO – Make glowing LED pressure sensitive drink coasters

How to make pressure sensitive “CoasterGlows” – “…the basic idea behind this little invention is that the coaster will light up only when there is something sitting on top of it. You can use a regular on/off power switch if you just want to be able to turn the lights on when you are having a drink but I think that this coaster with “pressure sensor” is more high-tech.” – [via] Link.