Theory of Operation
The most basic FSR consists of two membranes separated by a thin air gap. The air gap
is maintained by a spacer around the edges and by the rigidity of the two membranes.
One of the membranes has two sets of interdigitated fingers that are electrically distinct,
with each set connecting to one trace on a tail. The other membrane is coated with FSR
ink. When pressed, the FSR ink shorts the two traces together with a resistance that
depends on applied force.