A. Force Sensor Selection
Commercial force cells are commonly thick with heights
of around 11mm and expensive, if compared to 6USD
thin film force sensors with height of 0:1" (0:254mm).
In our design we considered thin film force sensors, since
these can be integrated under the shoe with the minimal
height increment. However, the drawback of these thin film
sensors is that their resistance response respect to the force
is nonlinear.