pad sensor of pressure

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i want sensor pad a4 paper format can recognize touch pressure in ipad or touch screen lcd.
where can find it?

you use 4 sensors in corners , calculate pressure point.

or matrix, this, http://www.instructables.com/id/rskin-open-source-robot-skin/step1/pressure-sensor-matrix-an-overview/

there foot pressure measuring devices. have matrix of pressure sensors analog value of force/pressure @ each point.

i found few interesting things:
http://www.sensorprod.com/dynamic/mattress.php
http://www.papierlogik.com/technology


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