I need to build something that is small, light and will be placed on pad.
This thing should have 2 sensors one on the top and one on the bottom.
(Must have 2 sensors, it cant have 1 sensor then if the other side doesnt have a sensor it equals a the 2nd value).
I dont know what kind of sensors and pad Im looking for... Can anyone give me an idea what kind of technology Im looking for.
-------------- <- side 1 of the card with a sensor
=========== <- some kind of material to block sensor 1 from being read
-------------- <- side 2 of a card with a second sensor
~~~~~~~~~~~ <- some sort of sensor pad connect to USB
that will read which ever sensor is touching it.
Anyone have an idea of what kind of technology that can solve my problem. Thanks 
(BTW Im a Canadian currently located in South Korea)
