For this pressure sensor we started by putting together 2 layers of spacer (on each side). Then we sewed some conductive thread (this one has steel in it) into the panels and put them together crisscross like #.
The next step was to sew some resistive plasticky fabric on top of one of the pads making sure that it covered all the conductive thread.
Then the two pads were sewn together.
With the sensor ready all that was left to do was to make it the on/off switch by attaching some conductive threads to a coincell batteryholder (containing a battery) and an LED light, taking care of making a circle with + & -.
Demonstration of strength of light according to how much pressure is put on the sensor. The resisitve fabric becomes more conductive the closer the circuits are together or how much pressure is applied to conduct the energy.