Here is the crochet
The main principle is same as regular pressure sensor. Instead of or thread, I used from Schoeller, Nm 50/2 60/40 Pes/Inox @ Euros 65.00/kg (25,000 metres/kg). Since this yarn is very thin, it is mixed with normal yarn and crochet, which is what you can see as gray patch in the middle. For the resistive material, anti-static foam is used instead of to support the sensor shape.