At the core of a force sensing resistor is a conductive polymer composite that changes resistance uniformly according to the force applied.
The conductive polymer is printed on the upper PET foil and the base foil consists of printed silver ink .
The two layers are separated by a spacer. When pressed together the electrical resistance decreases.
The signal is evaluated and can trigger appropriate actions with the help of intelligent software.
The variable resistor is associated with 2 printed resistors : one for the voltage divider and the second to pull down the voltage when no force is applied.
The measuring range of 10N corresponds to the pressure that a finger can exert without fatigue, under a total thickness remaining less than 0.8 mm.